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Name
  AR Lac  
AAVSO UID
000-BCQ-021 (5180 observations)  
Constellation
Lacerta Sequence
J2000.0
22 08 40.82 +45 44 32.1  (332.17008 +45.74225) Search nearby
B1950.0 22 06 39.49 +45 29 45.5
Proper motion
RA: -52.302 +/- 0.021 mas/yDec: 46.949 +/- 0.021 mas/ySource: Gaia DR1
Galactic coord. 95.557 -8.301
Other names

(Internal only)
1RXS J220840.9+454432 AAVSO 2204+45 AN 126.1907
BD+45 3813 HD 210334 HIP 109303
HR 8448 HV 2980 SAO 51684
X 22066+455    
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Variability type
EA/AR/RS
Spectral type G2IV-V+K0IV
Mag. range
6.08 - 6.77 V
Discoverer --
Epoch
28 Oct 2003 (HJD 2452941.4403) Ephemeris
Outburst --
Period 1.9832112 d
Rise/eclipse dur. 15%  (7.140 h)
Remarks
Some references may be clicked to view in new window. Roll over index number to view submission details.
1 GCVS Team Min II 6.43; Min II - Min I = 0.5018P; dI = 0.045P; DII = 0.13P; dII = 0.00P. P var. Min I = 2426624.378 + 1.983244d*E (JD2415300 - 26800) [H.Ruegemer, AN 245, 39, 1931.]; Min I = 2429535.739 + 1.9832125d*E (JD2426800 - 36000) [C.R.Chambliss, PASP 88, 762, 1976.]; Min I = 2437018.414 + 1.983252d*E (JD2436000 - 37500) [General Catalogue of Variable Stars, 4th Edition, Volumes I-III, P.N. Kholopov et al.]; since JD2437500 - see Table. There is a square term in the elements given in the Table: - 5.24d*10**(-9)*E**2. Shape of the light curve varies; there is a distortion wave with A up to 0.13mV migrating in the direction of decreasing phases with P ~2.5 yr. Spectrum investigations [R.F.Sanford, ApJ 113, 299, 1951., S.A.Naftilan, S.A.Drake, ApJ 216, 508, 1977., U.Kiziloglu, E.Derman, H.Ogelman, F.Tokdemir, AsAp 123, N1, 17, 1983.].
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References
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1 C. Lloyd, 2018, Summer Eclipsing Binaries BAA-VSS Circular #176, 2018
2 Bob Nelson's O-C files, 2016 --
3 J.S. Nichols et al., 2010, ApJS 188, 473 (online data) 2010ApJS..188..473N
4 S.Evren, C.Ibanoglu, O.Tuemer, Z. Tunca, A.Y.Ertan, ApSS 95, N2, 401, 1983. 1983Ap&SS..95..401E
5 F.W.Wright, HA 89, N10, 1937. 1932AnHar..89..171W
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Catalog Data
Information from selected catalogs obtained by cross-matching to 2 arc seconds using the CDS X-Match Service. These data may not be complete.
2MASS J = 5.08H = 4.33K = 4.27J - K = 0.81
AllWISE W1 = 4.18W2 = 3.81W3 = 4.20W4 = 4.15W1 - W2 = 0.37W3 - W4 = 0.05
Images
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Supporting Documents
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Revision History
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3 Otero, Sebastian Alberto 2018-06-04 19:40 UTC Elements from BAA-VSS Circular #176.
2 Admin, VSX 2010-01-04 23:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-17 20:33 UTC Initial upload.