PAGE i OBSERVED MINIMA TIMINGS OF ECLIPSING BINARIES NUMBER 4 Prepared by Marvin E. Baldwin Chairman, AAVSO Eclipsing Binary Committee Gerard Samolyk AAVSO Eclipsing Binary Committee October 1997 ============================================================================= PAGE ii Funds for publication were provided by The Harold S. Martin Fund. ISBN 1-878174-24-X COPYRIGHT 1997 The American Association of Variable Var Observers 25 Birch Street Cambridge, MA 02138 USA All rights reserved. No part of this book may be reproduced by any mechanical, photographic, or electronic process, nor may it be stored on an information retrieval system, transmitted, or otherwise copied for public or private use, without the written permission of the American Association of Variable Star Observers. ============================================================================= PAGE iii INTRODUCTION This compilation contains 1105 minima timings of 50 eclipsing binary stars. It represents a portion of the stars observed by participants in the AAVSO's eclipsing binary program since 1975 and continues the listing of minima published in Observed Minima Timings of Eclipsing Binaries Number 1, Number 2, and Number 3 (Baldwin and Samolyk 1993, 1995, 1996). Except where otherwise specified, all minima are determined from visual observations reduced by the authors using a computerized tracing paper method. The tracing paper software was written specifically for this purpose by Ron Baldwin and Gerard Samolyk. In instances where fragments of eclipses are observed during different cycles, the data points are reduced to heliocentric phase and combined into a single light curve for the tracing paper process. In these cases, the listed time of minimum is the eclipse nearest to the midpoint of the observing interval that corresponds to the calculated phase of minimum light. A footnote is added to these listings indicating the observing interval in Julian Date. Some CCD observations were reduced by the observers using the method of Kwee and Van Worden (1957). The standard error is included in a footnote in each of these cases. Linear elements in the General Catalogue of Variable Stars (Kholopov et al. 1985) were used to compute the O-C's except for Beta Lyr, for which the elements from Rudnicki et al. (1993) were used. All elements used in this publication are listed in Table 2. The number of observations used for the determination of each time of minimum is given under N. This work is sponsored by the AAVSO with Marvin Baldwin acting as program coordinator. The O-C diagrams accompanying the minima listings represent not only the minima tabulated here but also all previously published minima associated with the AAVSO program. The years spanned by these diagrams are listed by star in Table 2, with the second column giving the year of the earliest observation appearing in the diagram, and the third and fourth columns listing the earliest and latest year of the minima tabulated in this publication. Observers contributing data used in this publication are listed in Table 3. Their dedicated efforts are greatly appreciated. Marvin E. Baldwin Gerard Samolyk 8655 N. Co. Rd. 775E 9504 W. Barnard Ave. Butlerville, IN 47223 Greenfield, WI 53228 USA USA ============================================================================= PAGE iv REFERENCES 1 Ashbrook, J. 1963, Sky & Telescope, 25, 5, 277. 2 Ashbrook, J. 1963, Sky & Telescope, 26, 3, 153. 3 Ashbrook, J. 1964, Sky & Telescope, 27, 1, 58. 4 Ashbrook, J. 1964, Sky & Telescope, 27, 5, 317. 5 Ashbrook, J. 1964, Sky & Telescope, 28, 10, 244. 6 Ashbrook, J. 1965, Sky & Telescope, 29, 4, 254. 7 Robinson, L. J. 1965, Inf. Bull. Var. Stars, No. 111. 8 Robinson, L. J. 1965, Inf. Bull. Var. Stars, No. 114. 9 Robinson, L. J. 1965, Inf. Bull. Var. Stars, No. 119. 10 Robinson, L. J. 1966, Inf. Bull. Var. Stars, No. 129. 11 Robinson, L. J. 1966, Inf. Bull. Var. Stars, No. 154. 12 Robinson, L. J. 1967, Inf. Bull. Var. Stars, No. 180. 13 Robinson, L. J. 1967, Inf. Bull. Var. Stars, No. 221. 14 Robinson, L. J., and Ashbrook, J. 1968, Inf. Bull. Var. Stars, No. 247. 15 Baldwin, M. E. 1973, Inf. Bull. Var. Stars, No. 795. 16 Baldwin, M. E. 1974, J. Amer. Assoc. Var. Star Obs., 3, 60. 17 Baldwin, M. E. 1975, J. Amer. Assoc. Var. Star Obs., 4, 86. 18 Baldwin, M. E. 1976, J. Amer. Assoc. Var. Star Obs., 5, 29. 19 Baldwin, M. E. 1976, J. Amer. Assoc. Var. Star Obs., 5, 84. 20 Baldwin, M. E. 1977, J. Amer. Assoc. Var. Star Obs., 6, 24. 21 Baldwin, M. E. 1978, J. Amer. Assoc. Var. Star Obs., 7, 28. 22 Samolyk, G. 1992, J. Amer. Assoc. Var. Star Obs., 21, 111. 23 Baldwin, M. E., and Samolyk, G. 1993, Observed Minima Timiings of Eclipsing Binaries Number 1, AAVSO, Cambridge, MA. 24 Baldwin, M. E., and Samolyk, G. 1995, Observed Minima Timings of Eclipsing Binaries Number 2, AAVSO, Cambridge, MA. 25 Baldwin, M. E., and Samolyk, G. 1996, Observed Minima Timings of Eclipsing Binaries Number 3, AAVSO, Cambridge, MA. 26 Kholopov, P.N., et al. 1985, General Catalogue of Variable Stars, Fourth Edition, Moscow. 27 Kwee, K. K., and Van Worden, H. 1957, Bull. Astron. Inst. Netherlands, 12, 327. 28 Rudinicki, K., et al. 1993, Supplemento ad Annuario Cracoviense, 64, Krakow. ============================================================================= PAGE v TABLE 1 This table identifies publications in which previous AAVSO minima for each star have been published. Publication identification number as listed in the references. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 XZ AND X X X X X X X X X X X X X X CX AQR X X X X X X X X X X X V346 AQL X X X X X X X X X X X X X SS ARI X WW AUR X X X X X X X X X X X X X X VW BOO ZZ BOO AD BOO X AK CMI X RZ CAS X X X X X X X X X X X X X X X X X X X X AB CAS X X X X X X X X X X X X X IR CAS X X IV CAS X X X PV CAS V364 CAS U CEP X X X X X X X X X X X EG CEP X X X X X X X X X EK CEP X RW CRB W CRV X X X X RV CRV X ZZ CYG X X X X X X X X X X BR CYG X X X V456 CYG V466 CYG V548 CYG YY DEL X X X X X FZ DEL X X X X X X X Z DRA X X X X X X X X X X X X X AI DRA X X X X X X X X X X X X X YY ERI X X X X X X X X SX GEM X X SZ HER X X X X X X X X X X X X X X X X X X X BETA LYR X X X BO MON X EP MON SX OPH X U PEG X X X X X X X RT PER X X X X X X X X X X X X X X XZ PER X X X X X X X X WY TAU AC TAU V TRI X X RV TRI X X W UMA X X X X X X X X X ZZ UMA X AG VIR X AH VIR BE VUL BU VUL X X X X X X X X X X ============================================================================= PAGE vi TABLE 2 The O-C diagrams for each star contain the minima spanning the years in columns two and four. The listings of new minima span the years in columns three and four. The fifth and sixth columns contain the linear elements used to calculate the O-C values in this publication. Earliest Earliest Latest Epoch Period Minimum Listing Listing 2400000 + (days) XZ AND 1950 1991 1997 23977.1915 1.357278 CX AQR 1964 1992 1997 36453.555 0.5559862 V346 AQL 1965 1991 1997 41918.384 1.106363 SS ARI 1976 1979 1997 39028.395 0.4059936 WW AUR 1962 1993 1997 32945.5393 2.52501922 VW BOO 1977 1977 1996 31173.406 0.3423253 ZZ BOO 1976 1976 1996 38565.9192 4.991744 AD BOO 1975 1976 1996 41434.448 1.0344014 AK CMI 1967 1977 1997 43101.672 0.5658975 RZ CAS 1961 1995 1997 43200.3063 1.195247 AB CAS 1965 1992 1996 42714.4627 1.3668738 IR CAS 1975 1990 1996 42364.054 0.6806854 IV CAS 1968 1992 1994 40854.597 0.9985245 PV CAS 1976 1976 1996 40227.4044 1.75046986 V364 CAS 1977 1977 1994 34333.298 1.543068 U CEP 1964 1992 1997 44541.6031 2.4930475 EG CEP 1966 1991 1997 42594.3825 0.54462183 EK CEP 1967 1975 1996 39002.724 4.4277926 RW CRB 1977 1977 1997 40751.7302 0.7264114 W CRV 1971 1992 1997 39647.766 0.38808083 RV CRV 1975 1976 1997 41029.384 0.7472521 ZZ CYG 1965 1991 1997 45000.357 0.62861644 BR CYG 1968 1991 1996 41539.4654 1.33256415 V456 CYG 1976 1976 1996 44911.353 0.8911922 V466 CYG 1976 1976 1995 28774.389 1.39156629 V548 CYG 1976 1976 1996 44456.4958 1.805233 YY DEL 1966 1992 1996 42959.512 0.7930922 FZ DEL 1968 1991 1996 31324.329 0.7832126 Z DRA 1965 1992 1997 43499.736 1.357456 AI DRA 1964 1991 1997 43291.627 1.1988146 YY ERI 1968 1995 1997 41581.624 0.32149415 SX GEM 1968 1976 1997 19031.27 1.366877 SZ HER 1959 1991 1997 41864.30517 0.81809828 BETA LYR 1936 1994 1996 48990.54 12.93784 BO MON 1968 1983 1997 43507.597 2.2252193 EP MON 1978 1978 1993 32888.576 1.1480993 SX OPH 1975 1976 1990 33399.557 2.0633038 U PEG 1968 1992 1997 36511.66823 0.374781439 RT PER 1965 1976 1997 33376.0583 0.84940032 XZ PER 1966 1992 1997 43507.47742 1.15163412 WY TAU 1976 1976 1993 37402.258 0.6927584 AC TAU 1976 1976 1987 45636.59 2.043356 V TRI 1975 1992 1997 24474.305 0.5852057 RV TRI 1975 1992 1997 46033.308 0.75366648 W UMA 1966 1992 1997 45765.7385 0.33363749 ZZ UMA 1974 1976 1997 35951.484 2.29926 AG VIR 1975 1976 1996 45432.415 0.64265075 AH VIR 1977 1977 1997 45814.385 0.407521 BE VUL 1976 1976 1996 40111.381 1.552044 BU VUL 1966 1992 1996 33533.683 0.568993 ============================================================================= PAGE vii TABLE 3 This table lists the observers and the number of minima contributed by each. CCD stands for Charge-Coupled Device; PEP stands for Photoelectric Photometry (V); PHOTO stands for Photographic. E. Anderson 3 P. Atwood 22 M. Baldwin 325 D. Beard 3 R. Browning 1 J. Bueno 1 G. Chaple 10 E. Colombo 3 S. Cook 20 S. Cook (CCD) 29 R. Crumrine 1 M. Csukas 10 W. Dillon 2 A. Filho 1 S. Foglia 4 O. Gabzo 1 I. Gomez 1 P. Goodwin 1 E. Halbach 5 G. Hanson 7 R. Hays 24 M. Heifner 5 C. Hesseltine 3 R. Hill 33 S. Laskowski 3 G. Lubcke (CCD) 7 K. Luedeke (PEP) 5 J. McKenna 11 M. Nall 4 M. Nowak 1 D. Ruokonen 11 L. Salas 1 G. Samolyk 392 R. Schmude 42 D. Sharpe (PEP) 1 N. Simmons 1 W. Sizenski 3 C. Stephan 33 M. Suarez 2 P. Sullivan (PEP) 1 P. Sventek 3 F. Turi 1 G. Wedemayer 6 D. Williams 60 D. Williams (PHOTO) 1 43 observers 1105 ============================================================================= XZ AND JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48478.790 18052 0.016 17 M. Baldwin 48482.863 18055 0.017 10 M. Baldwin 48508.653 18074 0.019 11 M. Baldwin 48531.727 18091 0.019 9 M. Baldwin 48535.800 18094 0.020 19 R. Hill 48546.656 18102 0.018 14 M. Baldwin 48603.662 18144 0.018 16 R. Hill 48656.597 18183 0.020 14 M. Baldwin 48675.598 18197 0.019 13 M. Baldwin 48873.759 18343 0.017 16 R. Hill 48888.694 18354 0.022 12 R. Hill 48888.696 18354 0.024 11 M. Baldwin 48896.838 18360 0.022 13 M. Baldwin 48922.628 18379 0.024 16 G. Samolyk 49013.568 18446 0.027 14 M. Baldwin 49017.640 18449 0.027 14 M. Baldwin 49036.639 18463 0.024 19 G. Samolyk 49158.795 18553 0.025 6 M. Baldwin 49241.595 18614 0.031 13 M. Baldwin 49283.669 18645 0.029 18 D. Williams 49283.669 18645 0.029 16 G. Samolyk 49602.637 18880 0.037 17 G. Samolyk 49754.657 18992 0.042 18 G. Samolyk 49929.751 19121 0.047 18 M. Baldwin 49952.823 19138 0.045 13 M. Baldwin 49978.612 19157 0.046 18 G. Samolyk 49978.613 19157 0.047 18 M. Baldwin 50016.618 19185 0.048 14 G. Samolyk 50050.553 19210 0.051 16 G. Samolyk 50054.619 19213 0.045 18 M. Baldwin 50107.559 19252 0.051 14 G. Samolyk 50290.798 19387 0.058 10 M. Baldwin 50305.727 19398 0.057 13 M. Baldwin 50309.799 19401 0.057 15 M. Baldwin 50339.661 19423 0.059 11 M. Baldwin 50373.595 19448 0.061 7 M. Baldwin 50426.528 19487 0.060 13 C. Stephan 50430.600 19490 0.060 15 S. Cook (CCD) CX AQR JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48864.834 22323 -0.001 6 M. Baldwin 48888.740 22366 -0.002 12 M. Baldwin 48893.750 22375 0.004 14 M. Baldwin 48897.640 22382 0.002 14 M. Baldwin 49235.677 22990 -0.001 13 M. Baldwin 49235.681 22990 0.003 16 D. Williams 49249.577 23015 0.000 10 M. Baldwin 49250.693 23017 0.004 11 M. Baldwin 49254.586 23024 0.005 14 G. Samolyk 49264.590 23042 0.001 12 M. Baldwin 49264.593 23042 0.004 14 S. Cook 49264.594 23042 0.005 14 G. Samolyk 49333.526 23166 -0.005 14 M. Baldwin 49597.624 23641 -0.001 13 M. Baldwin 49602.629 23650 0.000 18 M. Baldwin 49602.635 23650 0.006 13 G. Samolyk 49641.551 23720 0.003 12 C. Stephan 49686.581 23801 -0.002 12 M. Baldwin 49900.643 24186 0.006 9 M. Suarez 49900.644 24186 0.007 9 I. Gomez 49900.648 : 24186 0.011 7 L. Salas 49926.769 24233 0.000 18 M. Baldwin 49960.685 24294 0.001 19 M. Baldwin 49965.688 24303 0.000 15 M. Baldwin 49989.593 24346 -0.002 14 M. Baldwin 49989.600 24346 0.005 18 G. Samolyk 49991.817 24350 -0.002 15 R. Hill 50010.720 24384 -0.003 11 R. Hill 50068.544 24488 -0.001 12 M. Baldwin 50284.819 : 24877 -0.005 11 G. Samolyk 50308.734 24920 0.003 15 M. Baldwin 50313.738 24929 0.003 12 G. Samolyk 50376.568 25042 0.007 14 G. Samolyk 50391.569 25069 -0.004 15 G. Samolyk 50392.682 25071 -0.003 19 R. Hill 50426.600 25132 0.000 12 C. Stephan V346 AQL JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48505.670 5954 0.001 14 D. Williams 48889.573 6301 -0.004 10 M. Baldwin 48889.582 6301 0.005 11 G. Samolyk 48890.677 6302 -0.007 17 M. Baldwin 49161.738 6547 -0.005 11 M. Baldwin 49213.739 6594 -0.003 14 M. Baldwin 49213.740 6594 -0.002 11 D. Williams 49243.613 6621 -0.000 9 M. Baldwin 49264.633 6640 -0.001 12 S. Cook 49284.546 6658 -0.003 13 D. Williams 49597.646 6941 -0.004 12 M. Baldwin 49619.776 6961 -0.001 10 R. Hill 49900.777 7215 -0.016 6 M. Baldwin 49900.793 7215 -0.000 16 R. Hays 49900.795 7215 0.002 12 D. Williams 49940.620 7251 -0.002 11 S. Cook (CCD) 49951.682 7261 -0.004 16 R. Hays 50013.638 7317 -0.004 17 R. Hays 50284.702 7562 0.001 14 G. Samolyk 50325.629 7599 -0.007 16 R. Hays 50387.583 7655 -0.010 18 R. Hays 50628.775 7873 -0.005 17 R. Hays SS ARI JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 44216.592 12779 0.005 13 M. Baldwin 46036.615 17262 -0.042 20 M. Baldwin 47083.655 19841 -0.059 13 M. Baldwin 47118.566 19927 -0.063 16 M. Baldwin 47139.677 19979 -0.064 13 M. Baldwin 48538.716 23425 -0.079 10 M. Baldwin 48547.631 23447 -0.096 13 M. Baldwin 48679.600 23772 -0.075 11 G. Samolyk 48922.585 24370.5 -0.077 12 G. Samolyk 48954.635 24449.5 -0.101 12 G. Samolyk 48976.767 24504 -0.095 10 G. Samolyk 49005.605 24575 -0.083 11 G. Samolyk 49333.627 25383 -0.104 14 G. Samolyk 49777.579 26476.5 -0.106 10 G. Samolyk 49955.800 26915.5 -0.116 11 G. Samolyk 50044.705 27134.5 -0.123 12 G. Samolyk 50051.612 27151.5 -0.118 20 P. Goodwin 50067.655 27191 -0.112 10 G. Samolyk 50320.777 27814.5 -0.127 13 G. Samolyk 50376.798 27952.5 -0.133 14 G. Samolyk 50455.567 28146.5 -0.127 13 G. Samolyk WW AUR JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 49004.666 6360 0.004 12 S. Cook 49051.371 6378.5 -0.003 101 O. Gabzo 49293.776 6474.5 -0.000 19 M. Csukas 49724.300 6645 0.008 12 S. Foglia 49754.607 6657 0.015 19 G. Samolyk 49759.653 6659 0.011 15 G. Samolyk 49778.591 6666.5 0.011 15 G. Samolyk 50043.709 : 6771.5 0.002 9 R. Schmude 50062.655 6779 0.010 18 G. Samolyk 50067.699 6781 0.004 16 G. Samolyk 50096.729 : 6792.5 -0.003 7 R. Schmude 50105.576 : 6796 0.006 6 R. Schmude 50110.623 6798 0.003 21 G. Samolyk 50139.645 6809.5 -0.013 9 R. Schmude 50466.649 6939 0.001 11 R. Schmude 50480.548 6944.5 0.013 10 R. Schmude 50485.574 6946.5 -0.011 10 R. Schmude 50514.629 6958 0.006 17 G. Samolyk VW BOO JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 43262.706 35315 0.082 17 G. Samolyk 43286.842 35385.5 0.084 13 G. Samolyk 43351.691 : 35575 0.062 9 G. Samolyk 44670.859 39428.5 0.080 13 G. Samolyk 44766.712 39708.5 0.082 10 G. Samolyk 45131.781 40775 0.061 9 G. Samolyk 46229.761 43982.5 0.032 13 P. Atwood 46939.731 46056.5 0.020 11 P. Atwood 46940.738 46059.5 0.000 10 P. Atwood 48709.704 51227 0.000 14 G. Samolyk 49485.7219 1) 53494 -0.0337 31 G. Lubcke (CCD) 49801.670 54417 -0.052 16 M. Baldwin 49812.638 54449 -0.038 11 M. Baldwin 49840.720 54531 -0.027 16 M. Baldwin 49858.823 54584 -0.067 19 G. Samolyk 49867.748 54610 -0.043 19 M. Baldwin 50217.7644 2) 55632.5 -0.0539 40 G. Lubcke (CCD) 50225.649 55655.5 -0.043 10 M. Baldwin 50226.678 55658.5 -0.041 14 M. Baldwin 1) Reduction by Lubcke, standard error +/-.0004 2) Reduction by Lubcke, standard error +/-.0004 ZZ BOO JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 42843.847 857 0.003 11 G. Wedemayer 42843.852 857 0.008 13 G. Samolyk 42908.736 870 -0.000 15 G. Samolyk 42923.737 873 0.025 13 G. Samolyk 43275.643 943.5 0.013 11 G. Samolyk 44635.891 1216 0.011 15 G. Samolyk 44670.835 1223 0.013 17 G. Samolyk 44720.728 1233 -0.012 13 M. Heifner 44725.722 1234 -0.009 25 M. Heifner 44735.725 1236 0.010 8 E. Halbach 44760.709 1241 0.035 13 D. Williams 46120.970 1513.5 0.046 11 P. Atwood 46210.814 1531.5 0.039 16 P. Atwood 46874.703 1664.5 0.026 26 R. Browning 46889.683 1667.5 0.031 15 G. Samolyk 47336.439 1757 0.026 10 G. Samolyk 47361.394 1762 0.022 8 G. Samolyk 48736.630 2037.5 0.032 12 S. Cook 49899.698 2270.5 0.024 14 G. Samolyk 50166.778 : 2324 0.046 9 S. Cook (CCD) 50201.712 2331 0.038 17 J. Mc Kenna 50216.690 : 2334 0.040 14 J. Mc Kenna 50221.656 2335 0.015 17 J. Mc Kenna 50221.658 2335 0.017 9 R. Schmude 50226.644 2336 0.011 10 R. Schmude AD BOO JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 42860.876 1379 -0.012 6 C. Hesseltine 42917.765 1434 -0.015 11 G. Samolyk 43190.826 : 1698 -0.036 14 G. Samolyk 43219.825 1726 0.000 16 G. Samolyk 44334.900 : 2804 -0.010 11 G. Hanson 44779.686 3234 -0.016 10 M. Heifner 45082.781 3527 -0.001 13 G. Samolyk 45442.761 : 3875 0.008 18 G. Samolyk 46169.922 4578 -0.016 10 P. Atwood 47161.910 : 5537 -0.019 15 G. Samolyk 47219.865 5593 0.010 18 G. Samolyk 48357.704 6693 0.007 18 G. Samolyk 49501.7627 3) 7799 0.0182 81 G. Lubcke (CCD) 49829.661 8116 0.011 17 S. Cook (CCD) 50189.636 8464 0.015 10 S. Cook (CCD) 3) Reduction by Lubcke, standard error +/-.0003 AK CMI JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 43170.712 122 0.001 15 G. Wedemayer 43175.799 131 -0.006 11 G. Wedemayer 44593.945 2637 0.001 15 G. Samolyk 44622.805 2688 0.001 14 G. Samolyk 44634.697 2709 0.009 13 G. Samolyk 45352.820 3978 0.008 13 G. Samolyk 46413.873 5853 0.003 13 G. Samolyk 46756.809 6459 0.005 14 G. Samolyk 47185.764 7217 0.010 19 R. Hill 48297.740 9182 -0.003 15 G. Samolyk 48645.770 9797 0.000 13 R. Hill 48654.825 9813 0.001 12 G. Samolyk 48976.815 10382 -0.005 13 G. Samolyk 49311.826 10974 -0.005 18 G. Samolyk 49418.775 11163 -0.011 14 R. Hill 49743.616 11737 0.005 16 G. Samolyk 50503.607 13080 -0.004 16 G. Samolyk 50513.772 13098 -0.025 21 R. Hill RZ CAS JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 49727.574 5461 0.024 14 C. Stephan 49776.579 5502 0.024 10 C. Stephan 49801.676 5523 0.021 14 G. Samolyk 49906.858 5611 0.021 11 D. Williams 49954.667 5651 0.020 12 D. Williams 49957.057 4) 5653 0.019 74 M. Nowak 50003.674 5692 0.022 14 D. Williams 50014.432 5) 5701 0.023 60 R. Schmude 50015.628 5702 0.023 17 G. Samolyk 50027.580 5712 0.023 12 R. Schmude 50033.554 5717 0.021 13 G. Samolyk 50039.533 5722 0.023 12 R. Schmude 50052.685 5733 0.028 9 R. Schmude 50064.630 5743 0.020 17 J. Mc Kenna 50095.712 5769 0.026 14 C. Stephan 50107.667 5779 0.028 11 R. Schmude 50113.642 5784 0.027 18 G. Samolyk 50125.591 5794 0.024 14 R. Schmude 50131.569 5799 0.025 14 R. Schmude 50309.653 5948 0.018 17 D. Williams 50321.615 5958 0.027 12 D. Williams 50321.615 5958 0.027 20 G. Chaple 50332.369 5967 0.024 25 S. Foglia 50370.618 5999 0.025 13 R. Schmude 50370.620 5999 0.027 18 G. Samolyk 50376.5945 5a) 6004 0.0252 37 D. Williams (PEP) 50376.594 6004 0.025 18 G. Samolyk 50376.595 6004 0.026 15 R. Schmude 50387.350 6013 0.023 23 S. Foglia 50395.723 6020 0.030 19 C. Stephan 50419.618 6040 0.020 19 R. Schmude 50425.595 6045 0.021 15 G. Samolyk 50425.598 6045 0.024 16 R. Schmude 50431.576 6050 0.025 14 C. Stephan 50456.680 6071 0.029 14 R. Schmude 50462.657 6076 0.030 16 R. Schmude 50468.631 6081 0.028 11 R. Schmude 50474.604 6086 0.024 23 G. Samolyk 50474.606 6086 0.026 14 R. Schmude 50474.607 6086 0.027 11 J. Mc Kenna 50480.580 6091 0.024 14 R. Schmude 50486.561 6096 0.029 15 J. Mc Kenna 50517.636 6122 0.028 23 G. Samolyk 50523.611 6127 0.026 11 D. Williams 50523.611 6127 0.026 23 G. Chaple 50523.613 6127 0.028 15 C. Stephan 4) Observations combined from 49896 to 50019 5) Observations combined from 49978 to 50052 5a) Reduction by Williams, standard error .0001 AB CAS JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48683.626 4367 0.025 20 M. Baldwin 48888.663 4517 0.031 13 M. Baldwin 48914.633 4536 0.031 15 M. Baldwin 49007.582 4604 0.032 16 G. Samolyk 49007.583 4604 0.033 15 M. Baldwin 49220.816 4760 0.034 14 M. Baldwin 49268.659 4795 0.036 13 M. Baldwin 49443.625 4923 0.043 11 M. Baldwin 49581.675 5024 0.038 10 M. Baldwin 49607.649 5043 0.042 10 M. Baldwin 49659.588 5081 0.040 12 M. Baldwin 49767.574 5160 0.042 13 M. Baldwin 49920.664 5272 0.043 10 M. Baldwin 49928.868 5278 0.045 11 M. Baldwin 49965.769 5305 0.041 15 M. Baldwin 50013.615 5340 0.046 9 M. Baldwin 50054.619 5370 0.044 18 M. Baldwin 50110.663 5411 0.046 16 M. Baldwin 50308.859 5556 0.045 11 M. Baldwin 50326.632 5569 0.049 12 M. Baldwin 50546.705 5730 0.055 14 M. Baldwin IR CAS JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48252.682 8651 0.019 13 R. Hill 48866.657 9553 0.015 12 M. Baldwin 48872.783 9562 0.015 10 R. Hill 48885.724 9581 0.023 15 G. Samolyk 48943.577 9666 0.018 10 M. Baldwin 49271.667 10148 0.018 12 M. Baldwin 49299.576 10189 0.018 10 M. Baldwin 49333.620 10239 0.028 19 G. Samolyk 49687.565 10759 0.017 11 M. Baldwin 49768.571 10878 0.021 12 M. Baldwin 49906.752 11081 0.023 17 G. Samolyk 49953.717 11150 0.021 7 M. Baldwin 49955.754 11153 0.016 12 M. Baldwin 50290.656 11645 0.021 17 M. Baldwin 50367.573 11758 0.020 15 G. Samolyk IV CAS JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48866.760 8024 0.002 11 M. Baldwin 48890.725 8048 0.003 6 M. Baldwin 48894.719 8052 0.003 7 M. Baldwin 48896.719 8054 0.006 15 M. Baldwin 48898.713 8056 0.003 15 M. Baldwin 48914.688 8072 0.001 18 M. Baldwin 48982.581 8140 -0.005 12 M. Baldwin 48983.582 8141 -0.003 12 M. Baldwin 49007.548 8165 -0.002 12 M. Baldwin 49508.802 8667 -0.007 17 G. Samolyk 49572.703 8731 -0.011 17 M. Baldwin 49580.697 8739 -0.006 21 M. Baldwin 49581.692 8740 -0.009 17 M. Baldwin 49594.673 8753 -0.009 13 M. Baldwin 49597.668 8756 -0.010 17 M. Baldwin 49602.658 8761 -0.012 14 M. Baldwin 49607.655 8766 -0.008 17 M. Baldwin 49614.644 8773 -0.008 15 M. Baldwin 49624.629 8783 -0.009 17 M. Baldwin 49635.615 8794 -0.006 19 G. Samolyk 49637.610 8796 -0.009 11 M. Baldwin 49653.588 8812 -0.007 16 M. Baldwin 49663.573 8822 -0.007 16 M. Baldwin 49698.523 8857 -0.005 10 G. Samolyk PV CAS JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 43100.773 1641.5 -0.028 12 D. Ruokonen 43100.774 1641.5 -0.027 15 G. Samolyk 43436.855 1833.5 -0.036 13 G. Samolyk 44525.644 2455.5 -0.039 12 G. Samolyk 45584.710 3060.5 -0.007 16 G. Samolyk 46020.562 3309.5 -0.022 9 D. Williams 46321.640 3481.5 -0.025 9 G. Samolyk 46363.647 3505.5 -0.029 12 G. Samolyk 47170.618 3966.5 -0.025 13 G. Samolyk 47744.774 4294.5 -0.023 13 G. Samolyk 47851.552 4355.5 -0.024 13 G. Samolyk 48917.596 4964.5 -0.016 14 G. Samolyk 49983.615 5573.5 -0.033 15 G. Samolyk 50053.649 5613.5 -0.018 15 G. Samolyk 50067.651 5621.5 -0.020 15 G. Samolyk 50284.704 5745.5 -0.025 15 G. Samolyk 50348.602 : 5782 -0.019 16 S. Cook (CCD) V364 CAS JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 43351.755 5844.5 -0.004 13 D. Ruokonen 43395.715 5873 -0.021 16 G. Samolyk 43436.628 5899.5 0.000 12 G. Samolyk 43777.629 6120.5 -0.017 12 G. Samolyk 44111.725 6337 0.005 13 G. Samolyk 44236.705 6418 -0.003 16 G. Samolyk 44493.619 6584.5 -0.010 8 G. Samolyk 44837.730 : 6807.5 -0.003 10 G. Samolyk 44915.651 6858 -0.007 13 G. Samolyk 45671.756 7348 -0.006 15 G. Samolyk 46445.587 7849.5 -0.023 15 G. Samolyk 46472.585 7867 -0.029 12 G. Samolyk 46759.598 8053 -0.027 17 G. Samolyk 47073.633 8256.5 -0.006 13 G. Samolyk 47466.322 8511 -0.028 15 G. Samolyk 48251.744 9020 -0.027 20 G. Samolyk 48501.722 9182 -0.026 21 G. Samolyk U CEP JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48652.687 1649 0.049 14 S. Cook 48662.666 1653 0.055 25 M. Baldwin 48682.608 1661 0.053 16 D. Williams 48869.596 : 1736 0.062 16 G. Samolyk 48954.356 1770 0.059 29 M. Csukas 48976.789 1779 0.054 24 G. Samolyk 49021.669 1797 0.060 22 M. Baldwin 49133.843 1842 0.046 14 M. Baldwin 49188.703 1864 0.059 23 M. Baldwin 49253.528 1890 0.065 20 M. Csukas 49390.646 1945 0.066 17 M. Baldwin 49400.623 1949 0.070 9 M. Baldwin 49744.659 2087 0.066 14 M. Baldwin 49749.650 2089 0.071 21 M. Baldwin 49754.640 2091 0.075 21 G. Samolyk 49759.621 2093 0.069 20 G. Samolyk 49906.714 2152 0.073 19 D. Williams 49906.714 2152 0.073 22 G. Samolyk 49916.686 2156 0.072 20 D. Williams 50270.706 2298 0.080 19 D. Williams 50487.596 6) 2385 0.075 24 G. Samolyk 50614.752 2436 0.085 25 G. Samolyk 50624.732 2440 0.093 18 W. Sizensky 50634.690 2444 0.079 17 W. Sizensky 6) Observations combined from 50482 to 50492 EG CEP JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48425.661 10707 0.013 11 S. Cook 48601.582 11030 0.021 17 G. Samolyk 48822.681 11436 0.003 15 M. Baldwin 48822.686 11436 0.008 12 D. Williams 48835.763 11460 0.014 8 D. Williams 48835.766 11460 0.017 16 G. Samolyk 48896.763 11572 0.017 10 M. Baldwin 48944.692 11660 0.019 12 R. Hill 49010.580 11781 0.008 12 M. Baldwin 49164.713 12064 0.013 15 G. Samolyk 49194.666 12119 0.012 12 S. Cook 49238.777 12200 0.008 10 M. Baldwin 49243.683 12209 0.013 12 M. Baldwin 49270.921 12259 0.019 11 G. Samolyk 49273.629 12264 0.004 12 G. Samolyk 49311.758 12334 0.010 15 G. Samolyk 49450.640 12589 0.013 9 R. Crumrine 49712.596 13070 0.006 9 M. Baldwin 49743.648 13127 0.015 15 G. Samolyk 49755.631 13149 0.016 13 M. Baldwin 49779.593 13193 0.015 16 G. Samolyk 49835.690 13296 0.016 18 M. Baldwin 49859.654 13340 0.016 14 M. Baldwin 49928.810 13467 0.005 9 M. Baldwin 49963.676 13531 0.016 15 D. Williams 50190.775 13948 0.007 12 M. Baldwin 50226.715 14014 0.002 16 M. Baldwin 50298.605 14146 0.002 9 S. Cook (CCD) 50438.581 14403 0.010 14 M. Baldwin 50462.546 14447 0.012 19 G. Chaple EK CEP JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 42447.547 778 0.000 14 C. Stephan 43204.697 949 -0.002 14 C. Hesseltine 43204.702 949 0.003 16 G. Samolyk 43970.703 1122 -0.004 19 G. Samolyk 45710.838 1515 0.008 17 D. Williams 45936.650 1566 0.003 10 D. Williams 46029.638 1587 0.007 15 D. Williams 46060.631 1594 0.006 15 D. Williams 46237.742 1634 0.005 12 D. Williams 46671.662 1732 0.001 12 D. Williams 47105.590 1830 0.006 16 G. Samolyk 49248.654 2314 0.018 14 S. Cook 49713.564 2419 0.010 17 G. Samolyk 49983.659 2480 0.009 14 S. Cook (CCD) 50284.744 2548 0.004 16 S. Cook (CCD) 50284.751 2548 0.011 18 G. Samolyk 50324.593 2557 0.003 7 S. Cook (CCD) RW CRB JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 43260.752 3454 -0.003 10 D. Ruokonen 43260.767 3454 0.012 11 G. Samolyk 43281.812 3483 -0.009 13 G. Samolyk 43701.682 4061 -0.005 11 G. Samolyk 44022.755 4503 -0.006 14 G. Samolyk 44038.748 4525 0.006 14 G. Samolyk 44399.766 5022 -0.002 15 G. Hanson 44402.666 5026 -0.008 12 G. Hanson 44431.724 5066 -0.006 16 G. Samolyk 44731.719 5479 -0.019 14 G. Samolyk 44731.726 5479 -0.012 13 G. Wedemayer 45193.724 : 6115 -0.012 12 G. Samolyk 45541.685 6594 -0.002 15 G. Samolyk 46210.712 7515 0.000 11 D. Williams 49906.681 12603 -0.012 17 G. Samolyk 50222.668 13038 -0.014 13 S. Cook (CCD) 50572.806 13520 -0.006 16 G. Samolyk W CRV JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48741.666 23433 0.002 10 M. Baldwin 48746.711 23446 0.002 9 M. Baldwin 48748.651 23451 0.001 8 M. Baldwin 49079.687 24304 0.005 13 C. Stephan 49089.779 24330 0.006 11 M. Baldwin 49105.693 24371 0.009 7 M. Baldwin 49133.632 24443 0.006 10 M. Baldwin 49423.722 25190.5 0.006 11 C. Stephan 49443.706 25242 0.004 12 M. Baldwin 49450.693 25260 0.005 15 M. Baldwin 49451.664 25262.5 0.006 10 M. Baldwin 49455.736 25273 0.003 7 M. Baldwin 49457.678 25278 0.005 11 M. Baldwin 49780.752 26110.5 0.001 10 M. Baldwin 49786.776 26126 0.010 11 M. Baldwin 49787.738 26128.5 0.002 13 M. Baldwin 49788.710 26131 0.004 15 M. Baldwin 49801.711 26164.5 0.004 9 M. Baldwin 49810.648 26187.5 0.015 10 M. Baldwin 49829.654 26236.5 0.005 9 M. Baldwin 49835.672 26252 0.008 15 M. Baldwin 49868.659 26337 0.008 15 G. Samolyk 49868.660 26337 0.009 12 M. Baldwin 50153.705 27071.5 0.009 11 M. Baldwin 50154.674 27074 0.008 10 M. Baldwin 50158.751 27084.5 0.010 11 M. Baldwin 50165.736 27102.5 0.009 10 M. Baldwin 50182.616 27146 0.008 7 M. Baldwin 50190.766 27167 0.008 11 M. Baldwin 50191.731 27169.5 0.003 11 M. Baldwin 50194.645 27177 0.006 7 M. Baldwin 50226.673 27259.5 0.018 11 M. Baldwin 50514.813 28002 0.008 13 M. Baldwin 50518.695 28012 0.009 11 M. Baldwin 50539.649 28066 0.006 10 M. Baldwin 50541.789 28071.5 0.012 7 M. Baldwin 50553.624 28102 0.011 7 M. Baldwin RV CRV JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 42880.744 : 2485.5 0.065 8 C. Hesseltine 42895.675 : 2505.5 0.051 8 G. Samolyk 43244.650 : 2972.5 0.059 10 G. Samolyk 46172.709 6891 0.011 11 S. Cook 46184.648 6907 -0.006 10 S. Cook 46568.744 7421 0.002 11 P. Atwood 46902.784 7868 0.020 13 P. Sventek 46920.729 7892 0.031 14 G. Samolyk 47644.782 8861 -0.003 14 P. Atwood 47996.712 9332 -0.029 12 P. Sventek 48297.890 9735 0.007 22 G. Samolyk 48357.662 9815 -0.001 16 G. Samolyk 49099.707 10808 0.022 9 M. Nall 49117.625 10832 0.006 12 M. Nall 49460.608 : 11291 0.001 10 G. Samolyk 49832.709 11789 -0.030 11 M. Baldwin 50196.671 : 12276 0.020 12 R. Hill 50518.699 12707 -0.017 13 S. Cook (CCD) ZZ CYG JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48525.625 5608 -0.013 10 P. Sventek 48855.646 6133 -0.016 12 D. Williams 48863.819 6146 -0.015 12 M. Baldwin 48875.774 6165 -0.003 14 R. Hill 48889.594 6187 -0.013 9 G. Samolyk 48889.602 6187 -0.005 9 M. Baldwin 49122.804 6558 -0.020 11 M. Baldwin 49124.687 6561 -0.022 13 M. Baldwin 49241.613 6747 -0.019 14 G. Samolyk 49275.558 6801 -0.019 11 M. Baldwin 49430.825 7048 -0.021 6 M. Baldwin 49508.773 7172 -0.021 12 G. Samolyk 49625.692 7358 -0.025 12 M. Baldwin 49688.555 7458 -0.023 11 M. Baldwin 49867.706 7743 -0.028 13 M. Baldwin 49899.775 7794 -0.019 12 G. Samolyk 49901.655 7797 -0.024 9 M. Baldwin 49906.682 7805 -0.026 13 G. Samolyk 49918.628 7824 -0.024 11 M. Baldwin 49962.631 7894 -0.024 12 D. Williams (PHOTO) 49962.632 7894 -0.023 9 D. Williams 50226.649 8314 -0.025 7 M. Baldwin 50309.626 8446 -0.025 11 M. Baldwin 50363.690 8532 -0.022 7 M. Baldwin 50370.607 8543 -0.020 14 G. Samolyk 50542.840 8817 -0.028 7 M. Baldwin 50639.658 8971 -0.017 11 C. Stephan BR CYG JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48480.795 5209 0.003 12 M. Baldwin 49089.775 5666 0.001 11 M. Baldwin 49133.751 5699 0.003 13 M. Baldwin 49197.712 5747 0.000 16 M. Baldwin 49213.705 5759 0.003 12 D. Williams 49241.690 5780 0.004 11 D. Williams 49241.693 5780 0.007 18 G. Samolyk 49894.649 6270 0.006 12 S. Cook (CCD) 49918.632 6288 0.003 14 M. Baldwin 49926.626 6294 0.002 8 S. Cook (CCD) 49954.600 6315 -0.008 9 M. Baldwin 49970.598 6327 -0.001 21 R. Hays 49978.592 6333 -0.002 8 M. Baldwin 49978.597 6333 0.003 17 G. Samolyk 50006.575 6354 -0.003 17 G. Samolyk 50026.566 6369 -0.000 22 R. Hays 50046.555 6384 0.000 12 M. Baldwin 50050.554 6387 0.001 21 R. Hays 50054.554 6390 0.004 15 M. Baldwin 50287.745 6565 -0.004 15 R. Hays 50327.728 6595 0.002 16 D. Williams 50339.721 6604 0.002 9 M. Baldwin 50363.709 6622 0.004 12 M. Baldwin V456 CYG JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 42998.854 -2146 -0.001 13 D. Ruokonen 43008.658 -2135 0.000 11 G. Samolyk 43269.780 -1842 0.003 9 D. Ruokonen 43326.820 -1778 0.007 14 G. Samolyk 43646.748 -1419 -0.003 11 G. Samolyk 44138.701 -867 0.012 14 G. Samolyk 44457.726 -509 -0.010 13 G. Samolyk 44752.713 : -178 -0.008 14 G. Samolyk 45235.756 364 0.009 15 G. Samolyk 45965.643 1183 0.010 12 D. Williams 47299.761 2680 0.013 12 G. Samolyk 47799.726 3241 0.019 14 G. Samolyk 48537.631 4069 0.017 18 G. Samolyk 48914.612 4492 0.024 13 G. Samolyk 49241.669 : 4859 0.013 14 G. Samolyk 50304.8899 7) 6052 0.0417 63 G. Lubcke (CCD) 7) Reduction by Lubcke, standard error +/-.0025 V466 CYG JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 43019.854 10237 0.001 8 E. Halbach 43079.687 10280 -0.003 9 G. Samolyk 43100.569 10295 0.005 14 G. Samolyk 43271.728 : 10418 0.001 8 D. Ruokonen 43344.793 10470.5 0.009 14 G. Samolyk 43413.668 10520 0.002 14 G. Samolyk 43646.753 10687.5 -0.001 13 G. Samolyk 44133.797 11037.5 -0.005 18 G. Samolyk 44138.664 11041 -0.008 13 G. Samolyk 44410.728 11236.5 0.004 14 G. Samolyk 44700.871 11445 0.006 14 G. Samolyk 44792.717 11511 0.008 17 G. Samolyk 45167.731 11780.5 -0.005 17 E. Halbach 45643.639 12122.5 -0.012 17 G. Samolyk 45876.735 12290 -0.004 14 G. Samolyk 46583.657 12798 0.003 12 G. Samolyk 49899.769 15181 0.012 18 G. Samolyk V548 CYG JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 43008.697 -802 -0.002 12 G. Samolyk 43304.741 -638 -0.016 13 G. Samolyk 43703.705 -417 -0.009 13 G. Samolyk 44111.700 -191 0.004 16 G. Samolyk 44445.656 -6 -0.008 12 G. Samolyk 44463.730 4 0.013 24 G. Hanson 44880.722 235 -0.004 17 G. Samolyk 45492.700 574 0.000 9 G. Samolyk 45622.681 646 0.005 18 G. Samolyk 45900.695 800 0.013 16 D. Williams 45956.644 831 -0.000 13 D. Williams 46068.588 893 0.019 14 G. Samolyk 49904.701 3018 0.012 19 S. Cook (CCD) 49989.559 : 3065 0.024 13 G. Samolyk 50312.692 3244 0.020 17 S. Cook (CCD) YY DEL JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48838.713 7413 0.009 10 M. Baldwin 48888.655 7476 -0.014 16 G. Samolyk 48923.556 7520 -0.009 11 M. Baldwin 49198.765 7867 -0.003 19 M. Baldwin 49206.700 7877 0.001 7 M. Baldwin 49237.626 7916 -0.004 15 G. Samolyk 49264.593 7950 -0.002 16 G. Samolyk 49264.595 7950 0.000 12 M. Baldwin 49271.726 7959 -0.007 17 M. Baldwin 49616.727 8394 -0.001 13 M. Baldwin 49655.593 8443 0.004 12 M. Baldwin 49659.550 8448 -0.005 14 M. Baldwin 49926.821 8785 -0.006 14 M. Baldwin 49992.639 8868 -0.015 18 G. Samolyk 50310.671 : 9269 -0.013 11 S. Cook (CCD) 50345.583 9313 0.003 10 M. Baldwin 50364.608 9337 -0.006 10 M. Baldwin FZ DEL JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48483.713 21909 -0.021 9 M. Baldwin 48527.574 21965 -0.020 12 C. Stephan 48852.603 22380 -0.024 12 M. Baldwin 48888.631 22426 -0.024 12 G. Samolyk 48917.607 22463 -0.027 13 G. Samolyk 49122.812 22725 -0.023 9 M. Baldwin 49195.644 22818 -0.030 8 M. Baldwin 49213.661 22841 -0.027 11 D. Williams 49213.665 22841 -0.023 9 S. Cook 49220.710 22850 -0.027 13 M. Baldwin 49235.592 22869 -0.026 10 D. Williams 49625.626 23367 -0.032 15 G. Samolyk 49899.758 23717 -0.024 17 G. Samolyk 49906.805 23726 -0.026 10 D. Williams 49921.686 23745 -0.026 12 S. Cook (CCD) 50243.579 24156 -0.034 12 F. Turi 50243.584 24156 -0.029 11 J. Bueno 50243.586 24156 -0.027 12 M. Suarez 50306.241 8) 24236 -0.029 11 S. Cook (CCD) 50391.607 24345 -0.033 18 G. Samolyk 50402.575 24359 -0.030 9 M. Baldwin 8) Observations combined from 50304 to 50308 Z DRA JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48914.558 3989 -0.070 13 G. Samolyk 49104.601 4129 -0.071 11 G. Samolyk 49199.622 4199 -0.072 14 D. Williams 49271.564 4252 -0.075 8 M. Baldwin 49275.637 4255 -0.074 9 M. Baldwin 49283.783 4261 -0.073 15 G. Samolyk 49442.600 4378 -0.078 12 G. Samolyk 49450.743 4384 -0.080 16 M. Baldwin 49488.750 4412 -0.082 11 M. Baldwin 49594.634 4490 -0.079 13 M. Baldwin 49685.582 4557 -0.081 13 M. Baldwin 49723.590 4585 -0.082 14 M. Baldwin 49742.594 4599 -0.082 17 M. Baldwin 49780.601 4627 -0.084 13 M. Baldwin 49868.833 4692 -0.087 16 M. Baldwin 49955.708 4756 -0.089 15 M. Baldwin 49978.786 4773 -0.087 14 M. Baldwin 50194.616 4932 -0.093 11 M. Baldwin 50202.763 4938 -0.091 17 R. Hill 50217.697 4949 -0.089 13 R. Hill 50270.637 4988 -0.090 11 D. Williams 50376.514 : 5066 -0.094 8 G. Samolyk 50578.768 5215 -0.101 15 G. Samolyk 50627.634 5251 -0.103 16 G. Chaple AI DRA JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48501.678 4346 0.003 16 D. Williams 48893.695 4673 0.007 10 N. Simmons 49074.696 4824 -0.013 9 M. Nall 49104.680 4849 0.001 14 S. Cook 49134.649 4874 -0.000 11 M. Nall 49193.401 4923 0.010 7 M. Csukas 49223.365 4948 0.003 16 M. Csukas 49253.347 4973 0.015 12 M. Csukas 49603.407 : 5265 0.021 15 M. Csukas 49634.559 5291 0.004 13 C. Stephan 49840.754 5463 0.003 19 R. Hays 49888.703 5503 -0.001 18 R. Hays 49900.699 5513 0.007 15 D. Williams 49954.637 5558 -0.002 15 D. Williams 49972.607 5573 -0.014 11 R. Schmude 49978.609 5578 -0.006 19 G. Samolyk 50002.598 5598 0.007 16 R. Hays 50026.559 5618 -0.008 12 R. Schmude 50044.528 : 5633 -0.022 9 R. Schmude 50250.744 5805 -0.002 16 R. Hays 50268.726 5820 -0.002 15 R. Hays 50274.729 5825 0.007 19 R. Schmude 50304.696 5850 0.004 9 R. Schmude 50310.689 5855 0.003 16 R. Hays 50370.634 5905 0.007 17 G. Samolyk 50376.624 5910 0.003 21 G. Samolyk 50636.775 6127 0.011 11 W. Sizensky YY ERI JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 50043.720 26321 0.048 8 R. Schmude 50078.614 26429.5 0.060 12 C. Stephan 50095.648 26482.5 0.055 18 C. Stephan 50097.579 26488.5 0.057 14 C. Stephan 50101.601 26501 0.061 12 C. Stephan 50127.627 26582 0.046 14 C. Stephan 50128.603 26585 0.057 16 C. Stephan 50376.803 27357 0.064 17 G. Samolyk 50395.768 27416 0.060 15 C. Stephan 50396.732 27419 0.060 11 C. Stephan 50428.567 27518 0.067 15 C. Stephan 50455.566 27602 0.060 13 G. Samolyk 50461.526 27620.5 0.073 8 C. Stephan 50466.658 27636.5 0.061 15 C. Stephan 50474.378 27660.5 0.065 15 M. Csukas 50481.603 27683 0.056 12 C. Stephan 50491.572 27714 0.059 12 C. Stephan 50499.606 27739 0.056 20 G. Samolyk 50503.631 27751.5 0.062 15 G. Samolyk SX GEM JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 42873.671 : 17443 -0.035 11 G. Wedemayer 43577.621 17958 -0.026 15 G. Samolyk 43883.791 18182 -0.037 14 G. Samolyk 44598.663 18705 -0.041 16 G. Samolyk 44635.573 18732 -0.037 14 G. Samolyk 44989.578 18991 -0.053 13 G. Samolyk 45060.652 19043 -0.057 14 G. Samolyk 45373.680 : 19272 -0.044 12 G. Samolyk 45671.663 19490 -0.040 14 G. Samolyk 45753.649 19550 -0.066 21 G. Samolyk 46413.857 20033 -0.060 17 G. Samolyk 46431.633 20046 -0.053 13 D. Williams 46442.573 20054 -0.048 14 D. Williams 46472.632 20076 -0.061 17 G. Samolyk 49743.581 22469 -0.048 17 G. Samolyk 50492.615 23017 -0.063 20 G. Samolyk SZ HER JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48414.793 8007 -0.025 19 R. Hill 48801.765 8480 -0.014 13 D. Williams 48901.572 8602 -0.015 13 M. Baldwin 49134.726 8887 -0.019 14 M. Baldwin 49165.817 8925 -0.015 11 D. Williams 49184.632 8948 -0.017 13 G. Samolyk 49238.628 9014 -0.015 10 M. Baldwin 49247.627 9025 -0.015 12 S. Cook 49480.784 9310 -0.016 17 G. Samolyk 49507.7793 9) 9343 -0.0181 81 G. Lubcke (CCD) 49602.680 9459 -0.017 14 M. Baldwin 49607.588 9465 -0.017 10 M. Baldwin 49616.586 9476 -0.018 15 M. Baldwin 49625.586 9487 -0.018 17 G. Samolyk 49625.587 9487 -0.017 12 M. Baldwin 49840.745 9750 -0.018 12 M. Baldwin 49867.740 9783 -0.021 13 M. Baldwin 49899.650 9822 -0.016 12 G. Samolyk 49917.645 9844 -0.020 12 D. Williams 49953.642 9888 -0.019 13 D. Williams 49962.641 9899 -0.019 14 D. Williams 50191.708 10179 -0.020 10 M. Baldwin 50213.792 10206 -0.024 17 R. Hill 50308.693 10322 -0.023 9 M. Baldwin 50349.600 10372 -0.021 17 M. Baldwin 50367.601 10394 -0.018 14 G. Samolyk 50376.600 10405 -0.018 17 G. Samolyk 50523.855 10585 -0.020 16 G. Samolyk 50546.764 10613 -0.018 14 M. Baldwin 50578.665 10652 -0.023 14 R. Hays 50596.669 10674 -0.017 23 D. Beard 50614.662 10696 -0.022 14 R. Hays 50614.667 10696 -0.017 22 D. Beard 50641.655 10729 -0.027 10 R. Crumrine 50650.659 10740 -0.022 25 D. Beard 9) Reduction by Lubcke, standard error .0002d BETA LYR JD(min) OBSERVING HEL. CYCLE O-C N OBSERVER INTERVAL 2400000 + JD 49650.57 51 0.20 67 R. Schmude 49223 to 50080 49657.22 51.5 0.38 67 R. Schmude 49223 to 50080 49844.50 66 0.06 62 E. Anderson 49659 to 50017 49851.19 66.5 0.28 63 E. Anderson 49659 to 50017 49896.48 70 0.29 60 G. Samolyk 49843 to 49943 49902.69 70.5 0.03 60 G. Samolyk 49843 to 49943 49909.35 71 0.22 47 S. Laskowski 49857 to 49960 49915.66 71.5 0.06 47 S. Laskowski 49857 to 49960 49961.08 75 0.20 44 E. Colombo 49859 to 50072 49961.13 10) 75 0.25 6 D. Williams 49935 to 49999 49961.24 75 0.36 47 J. Mc Kenna 49841 to 50068 49967.44 75.5 0.09 47 J. Mc Kenna 49841 to 50068 49967.53 75.5 0.18 45 E. Colombo 49859 to 50072 50025.55 80 -0.02 27 G. Chaple 49964 to 50079 50025.87 80 0.30 17 W. Dillon 49980 to 50062 50032.28 80.5 0.24 17 W. Dillon 49980 to 50062 50032.29 80.5 0.25 27 G. Chaple 49964 to 50079 50142.01 : 89 0.00 98 R. Schmude 50025 to 50264 50148.54 : 89.5 0.06 98 R. Schmude 50025 to 50264 50207.05 94 0.35 137 G. Chaple 49964 to 50448 50213.18 94.5 0.01 137 G. Chaple 49964 to 50448 50220.09 95 0.46 117 E. Anderson 50026 to 50414 50232.66 96 0.09 111 E. Colombo 50024 to 50447 50239.31 96.5 0.27 94 J. Mc Kenna 50053 to 50416 50271.41 99 0.02 26 G. Samolyk 50216 to 50326 50271.40 99 0.01 54 S. Laskowski 50205 to 50349 50368.53 106.5 0.11 120 R. Schmude 50265 to 50448 50387.97 108 0.14 33 S. Foglia 50333 to 50447 10) Time of minimum determined by Williams from mean phase of his observations at 4.3 magnitude or fainter. BO MON JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 45405.706 853 -0.003 25 G. Samolyk 46097.747 1164 -0.005 13 P. Atwood 46413.728 1306 -0.005 15 G. Samolyk 46442.656 1319 -0.005 12 M. Baldwin 46482.711 1337 -0.004 15 P. Atwood 46511.639 1350 -0.004 20 M. Baldwin 46887.698 1519 -0.007 10 P. Atwood 47203.673 1661 -0.013 13 P. Atwood 47212.580 1665 -0.007 12 G. Samolyk 47232.605 1674 -0.010 11 M. Baldwin 47539.674 1812 -0.020 13 G. Samolyk 48251.728 2132 -0.037 17 G. Samolyk 48685.635 2327 -0.047 6 M. Baldwin 50109.742 2967 -0.081 14 R. Hill 50503.607 3144 -0.079 18 G. Samolyk 50523.627 3153 -0.086 17 G. Samolyk EP MON JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 43556.732 9292 0.017 15 G. Samolyk 43820.799 9522 0.021 14 G. Samolyk 44238.703 9886 0.017 14 G. Samolyk 44238.704 9886 0.018 12 G. Wedemayer 44672.672 10264 0.005 16 G. Samolyk 45021.695 10568 0.006 15 G. Samolyk 46091.731 11500 0.013 25 G. Samolyk 46820.780 12135 0.019 18 G. Samolyk 47161.752 12432 0.006 19 G. Samolyk 47540.642 12762 0.023 23 G. Samolyk 48308.717 13431 0.019 23 M. Baldwin 49021.705 14052 0.038 17 M. Baldwin 49036.632 14065 0.039 13 M. Baldwin 49036.634 14065 0.041 18 G. Samolyk SX OPH JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 42921.702 : 4615 -0.002 8 E. Halbach 42923.768 4616 0.001 14 G. Samolyk 42925.816 4617 -0.015 13 G. Samolyk 42985.652 : 4646 -0.014 6 D. Ruokonen 42985.662 : 4646 -0.004 7 G. Samolyk 43315.779 4806 -0.016 9 G. Samolyk 43672.719 : 4979 -0.028 12 G. Samolyk 43672.736 4979 -0.011 10 M. Baldwin 44780.759 5516 0.018 11 E. Halbach 45463.686 5847 -0.008 14 G. Samolyk 45888.721 6053 -0.014 12 G. Samolyk 46606.758 6401 -0.007 10 P. Atwood 46606.774 6401 0.009 15 G. Samolyk 47295.933 6735 0.025 11 P. Atwood 47681.763 6922 0.017 15 G. Samolyk 47714.744 6938 -0.015 11 P. Atwood 48133.601 7141 -0.008 12 G. Samolyk U PEG JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48885.800 33017 -0.027 13 G. Samolyk 48888.595 33024.5 -0.043 11 G. Samolyk 48897.587 33048.5 -0.046 12 G. Samolyk 48954.561 33200.5 -0.038 15 G. Samolyk 49241.652 33966.5 -0.030 14 G. Samolyk 49270.862 34044.5 -0.053 12 G. Samolyk 49333.651 34212 -0.040 15 G. Samolyk 49625.600 34991 -0.046 16 G. Samolyk 49637.607 35023 -0.032 14 G. Samolyk 49679.571 35135 -0.043 13 G. Samolyk 49925.794 35792 -0.051 8 A. Filho 49955.788 35872 -0.040 11 G. Samolyk 50000.569 35991.5 -0.045 15 G. Samolyk 50003.574 35999.5 -0.039 15 G. Samolyk 50301.690 : 36795 -0.061 12 S. Cook (CCD) 50320.810 36846 -0.055 13 G. Samolyk 50376.660 36995 -0.048 12 G. Samolyk 50390.522 : 37032 -0.052 11 C. Stephan 50425.556 37125.5 -0.061 15 G. Samolyk 50455.550 37205.5 -0.049 14 G. Samolyk RT PER JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48267.777 17532 0.032 11 R. Hill 48278.8130 17545 0.0261 19 P. Sullivan (PEP) 48296.651 17566 0.027 16 M. Baldwin 48538.732 17851 0.029 15 M. Baldwin 48601.589 17925 0.030 14 M. Baldwin 48888.681 18263 0.025 13 M. Baldwin 48893.779 18269 0.026 20 M. Baldwin 48894.628 18270 0.026 12 M. Baldwin 48950.698 18336 0.035 13 R. Hill 48955.792 18342 0.033 19 R. Hill 49007.605 18403 0.033 15 G. Samolyk 49220.798 18654 0.026 17 M. Baldwin 49243.730 18681 0.024 8 M. Baldwin 49266.664 18708 0.025 17 M. Baldwin 49270.918 18713 0.032 14 G. Samolyk 49316.787 18767 0.033 15 R. Hill 49327.827 18780 0.031 13 R. Hill 49333.776 18787 0.034 16 G. Samolyk 49673.537 19187 0.035 7 M. Baldwin 49707.511 19227 0.033 11 M. Baldwin 49746.588 19273 0.037 15 R. Hays 49774.614 19306 0.033 15 R. Hays 49774.614 19306 0.033 7 M. Baldwin 49965.723 19531 0.027 12 M. Baldwin 50044.728 19624 0.038 17 G. Samolyk 50045.576 19625 0.036 17 C. Stephan 50096.542 19685 0.038 10 R. Hays 50152.599 19751 0.035 16 R. Hays 50456.681 20109 0.032 15 R. Hays 50462.632 20116 0.037 15 R. Hays XZ PER JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48893.646 4677 -0.024 13 M. Baldwin 48923.588 4703 -0.025 12 M. Baldwin 49220.703 4961 -0.031 14 M. Baldwin 49243.737 4981 -0.030 8 M. Baldwin 49250.647 4987 -0.030 10 M. Baldwin 49266.771 5001 -0.029 16 M. Baldwin 49326.660 5053 -0.025 10 R. Hill 49327.802 5054 -0.034 15 R. Hill 49333.560 5059 -0.034 16 M. Baldwin 49455.638 5165 -0.030 6 M. Baldwin 49637.594 5323 -0.032 10 M. Baldwin 49637.596 5323 -0.030 19 G. Samolyk 49713.599 5389 -0.035 19 M. Baldwin 49713.602 5389 -0.032 14 G. Samolyk 49774.636 5442 -0.034 9 M. Baldwin 49789.608 5455 -0.034 19 M. Baldwin 49965.807 5608 -0.035 23 M. Baldwin 50041.817 5674 -0.032 13 M. Baldwin 50047.570 5679 -0.038 18 M. Baldwin 50047.573 5679 -0.035 18 C. Stephan 50154.674 5772 -0.036 13 M. Baldwin 50337.776 5931 -0.043 12 M. Baldwin 50397.671 5983 -0.033 11 J. Mc Kenna 50420.693 6003 -0.044 14 M. Baldwin 50427.605 6009 -0.042 15 J. Mc Kenna 50488.642 6062 -0.041 18 G. Samolyk 50495.557 6068 -0.036 24 G. Chaple 50518.583 6088 -0.043 10 M. Baldwin 50541.611 6108 -0.048 11 M. Baldwin WY TAU JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 43098.829 8223 0.019 14 G. Samolyk 43100.896 8226 0.007 9 D. Ruokonen 43100.898 8226 0.009 9 G. Samolyk 43184.722 8347 0.010 14 G. Samolyk 43436.872 8711 -0.004 13 G. Samolyk 44160.837 9756 0.028 16 G. Samolyk 44614.584 10411 0.018 13 G. Samolyk 44616.666 10414 0.022 19 G. Hanson 44995.589 10961 0.006 13 G. Samolyk 45315.662 11423 0.025 12 G. Samolyk 45405.682 11553 -0.014 12 G. Samolyk 45671.722 11937 0.007 17 G. Samolyk 47115.799 14021.5 0.029 11 R. Hill 48219.714 15615 0.034 18 G. Samolyk 49060.704 16829 0.015 16 G. Samolyk AC TAU JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 43098.744 -1242 0.002 17 G. Samolyk 43895.663 -852 0.012 21 M. Heifner 44222.589 -692 0.001 14 G. Samolyk 44226.702 : -690 0.028 11 M. Heifner 44271.635 -668 0.007 17 G. Samolyk 45352.584 : -139 0.020 10 G. Samolyk 45732.634 47 0.006 14 G. Samolyk 46108.598 231 -0.007 11 S. Cook 46112.700 233 0.008 16 P. Atwood 46437.593 392 0.007 10 G. Samolyk 46439.634 393 0.005 16 D. Williams 46441.677 394 0.005 11 D. Williams 46735.925 538 0.009 15 P. Atwood 46819.700 579 0.007 12 R. Hill 47152.771 742 0.011 19 P. Atwood V TRI JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48655.584 41321 -0.006 19 M. Baldwin 48893.766 41728 -0.002 13 M. Baldwin 48896.692 41733 -0.002 12 M. Baldwin 48954.630 41832 0.000 16 G. Samolyk 49397.624 42589 -0.007 16 G. Samolyk 49713.647 43129 0.005 9 M. Baldwin 49716.573 43134 0.005 17 C. Stephan 49723.589 43146 -0.001 13 M. Baldwin 49954.746 43541 -0.000 14 M. Baldwin 49978.740 43582 0.000 9 M. Baldwin 50094.614 43780 0.003 11 S. Cook (CCD) 50097.534 43785 -0.003 10 M. Baldwin 50097.534 : 43785 -0.003 12 C. Stephan 50104.557 43797 -0.002 17 M. Baldwin 50308.796 44146 0.000 16 M. Baldwin 50349.760 44216 -0.000 13 M. Baldwin 50363.808 44240 0.003 10 M. Baldwin 50372.588 44255 0.005 12 M. Baldwin 50373.753 44257 -0.001 13 M. Baldwin 50376.683 44262 0.003 18 G. Samolyk 50420.571 44337 0.001 17 M. Baldwin 50461.542 44407 0.007 17 G. Chaple RV TRI JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48654.544 3478 -0.016 12 M. Baldwin 48864.815 3757 -0.018 7 M. Baldwin 48914.554 3823 -0.021 10 M. Baldwin 48923.601 3835 -0.018 11 M. Baldwin 49247.681 4265 -0.015 10 S. Cook 49330.583 4375 -0.016 12 M. Baldwin 49333.595 4379 -0.019 14 M. Baldwin 49688.575 4850 -0.015 12 M. Baldwin 49743.595 4923 -0.013 17 G. Samolyk 49926.738 5166 -0.011 11 M. Baldwin 49978.742 5235 -0.010 9 M. Baldwin 50308.848 5673 -0.010 10 M. Baldwin 50370.647 5755 -0.012 18 G. Samolyk 50373.665 5759 -0.008 7 M. Baldwin 50376.679 5763 -0.009 17 G. Samolyk 50422.653 5824 -0.009 13 M. Baldwin 50453.551 5865 -0.011 12 S. Cook (CCD) 50456.568 5869 -0.009 7 M. Baldwin W UMA JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48733.437 8895 -0.007 16 M. Csukas 48976.826 9624.5 -0.007 11 G. Samolyk 49060.728 9876 -0.014 12 G. Samolyk 49333.817 10694.5 -0.008 13 G. Samolyk 49426.888 10973.5 -0.021 17 G. Samolyk 49500.635 11194.5 -0.008 12 G. Samolyk 49702.483 11799.5 -0.011 9 M. Csukas 49858.785 12268 -0.018 15 G. Samolyk 49868.631 12297.5 -0.015 12 G. Samolyk 50098.670 12987 -0.019 8 R. Schmude 50104.664 : 13005 -0.030 9 R. Schmude 50107.658 : 13014 -0.039 9 R. Schmude 50122.687 13059 -0.023 14 S. Cook (CCD) 50125.866 13068.5 -0.014 12 G. Samolyk 50130.692 13083 -0.026 11 S. Cook (CCD) 50131.693 13086 -0.026 11 R. Schmude 50152.723 13149 -0.015 15 G. Samolyk 50191.594 13265.5 -0.013 11 G. Samolyk 50473.671 14111 -0.026 31 K. Luedeke (PEP) 50478.676 14126 -0.026 28 K. Luedeke (PEP) 50479.674 14129 -0.029 25 K. Luedeke (PEP) 50488.692 14156 -0.019 15 G. Samolyk 50511.704 14225 -0.028 49 K. Luedeke (PEP) 50523.715 14261 -0.028 33 K. Luedeke (PEP) 50572.766 14408 -0.021 11 G. Samolyk ZZ UMA JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 43083.784 3102 -0.005 10 G. Samolyk 43290.713 3192 -0.009 9 D. Ruokonen 43290.726 3192 0.004 12 G. Samolyk 43982.805 3493 0.006 16 G. Samolyk 44281.716 3623 0.013 12 G. Hanson 44626.584 3773 -0.008 14 G. Hanson 44635.800 3777 0.011 17 G. Samolyk 45026.665 3947 0.002 14 G. Samolyk 45541.687 4171 -0.010 15 G. Samolyk 46240.675 4475 0.003 9 D. Williams 46893.667 : 4759 0.005 6 R. Hill 47861.654 5180 0.003 14 G. Samolyk 48661.806 5528 0.013 15 G. Samolyk 48976.796 5665 0.004 18 G. Samolyk 49397.554 5848 -0.002 10 G. Samolyk 50151.706 6176 -0.008 18 S. Cook (CCD) 50496.597 6326 -0.006 15 S. Cook (CCD) 50519.599 6336 0.004 12 G. Samolyk AG VIR JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 42897.802 -3944 0.002 13 D. Sharpe (PEP) 43262.813 -3376 -0.013 19 G. Samolyk 43262.829 -3376 0.003 16 D. Ruokonen 43577.696 : -2886 -0.029 16 G. Samolyk 44334.759 -1708 -0.008 20 G. Samolyk 46165.685 1141 0.006 11 S. Cook 46174.682 1155 0.006 9 S. Cook 46181.747 1166 0.002 8 P. Atwood 46206.801 1205 -0.008 12 P. Atwood 46530.710 1709 0.005 11 P. Atwood 46915.668 : 2308 0.015 10 G. Samolyk 46940.723 2347 0.007 10 P. Atwood 47629.645 : 3419 0.007 15 G. Samolyk 48003.656 4001 -0.004 12 G. Samolyk 50163.613 7362 0.004 6 S. Cook (CCD) AH VIR JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 43176.892 -6472 -0.017 16 G. Samolyk 43243.712 -6308 -0.031 11 G. Samolyk 43948.709 -4578 -0.045 18 G. Samolyk 44324.651 -3655.5 -0.041 10 G. Samolyk 44635.808 -2892 -0.026 16 G. Samolyk 45797.698 -41 0.021 20 G. Samolyk 46875.601 2604 0.031 11 G. Samolyk 46875.800 2604.5 0.027 18 G. Samolyk 46924.694 2724.5 0.018 16 G. Samolyk 47161.895 3306.5 0.042 18 G. Samolyk 47658.653 4525.5 0.032 13 G. Samolyk 49830.7902 11) 9855.5 0.0820 49 G. Lubcke (CCD) 50514.635 11533.5 0.107 13 G. Samolyk 50523.793 11556 0.095 19 G. Samolyk 50545.603 : 11609.5 0.103 12 M. Baldwin 50547.629 11614.5 0.091 22 G. Samolyk 50572.692 11676 0.092 19 G. Samolyk 11) Reduction by Lubcke, standard error +/-.0009 BE VUL JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 42999.739 1861 0.004 10 D. Ruokonen 43013.712 1870 0.009 14 G. Samolyk 44101.697 2571 0.011 19 G. Samolyk 44520.743 2841 0.005 13 G. Samolyk 45591.653 3531 0.005 20 G. Samolyk 45622.690 3551 0.001 19 G. Samolyk 45937.765 3754 0.011 13 D. Williams 45965.698 3772 0.007 13 D. Williams 46021.572 3808 0.007 12 D. Williams 47084.733 4493 0.018 12 R. Hill 47474.272 : 4744 -0.006 6 G. Samolyk 48501.744 5406 0.013 20 G. Samolyk 48914.583 5672 0.008 13 G. Samolyk 49988.600 6364 0.011 19 G. Samolyk 50258.664 6538 0.019 10 S. Cook (CCD) 50275.7303 12) 6549 0.0131 65 G. Lubcke (CCD) 50320.739 6578 0.013 15 D. Williams 50320.745 6578 0.019 21 G. Samolyk 12) Reduction by Lubcke, standard error .0004d BU VUL JD(min) HEL. CYCLE O-C N OBSERVER 2400000 + 48885.682 26981 -0.001 12 M. Baldwin 48885.688 26981 0.005 17 G. Samolyk 48893.655 26995 0.006 19 M. Baldwin 48897.626 27002 -0.006 15 G. Samolyk 48897.636 27002 0.004 14 M. Baldwin 48898.776 27004 0.006 11 M. Baldwin 48901.617 27009 0.002 15 M. Baldwin 49223.675 27575 0.010 8 S. Cook 49235.620 27596 0.006 11 S. Cook 49264.627 27647 -0.005 14 G. Samolyk 49264.632 27647 0.000 10 S. Cook 49480.853 28027 0.003 14 G. Samolyk 49594.653 28227 0.005 14 M. Baldwin 49602.614 28241 -0.000 14 G. Samolyk 49602.620 28241 0.006 11 M. Baldwin 49635.619 28299 0.003 17 G. Samolyk 49680.575 28378 0.009 14 M. Baldwin 49713.561 28436 -0.007 14 G. Samolyk 49713.570 28436 0.002 14 M. Baldwin 49867.768 28707 0.003 16 M. Baldwin 49928.654 28814 0.007 11 S. Cook (CCD) 49928.655 28814 0.008 12 M. Baldwin 49958.811 28867 0.007 16 M. Baldwin 49962.790 28874 0.003 16 M. Baldwin 49965.636 28879 0.004 15 M. Baldwin 49978.724 28902 0.005 13 M. Baldwin 50006.606 28951 0.007 18 G. Samolyk 50043.588 29016 0.004 17 G. Samolyk 50226.804 29338 0.004 13 M. Baldwin 50304.758 29475 0.006 13 G. Samolyk 50320.697 29503 0.014 18 G. Samolyk 50336.620 29531 0.005 12 M. Baldwin 50337.764 29533 0.011 11 M. Baldwin 50422.542 29682 0.009 11 M. Baldwin ======================================================================== END OF OBSERVED MINIMA TIMINGS OF ECLIPSING BINARIES NUMBER 4 ========================================================================