THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS 25 Birch Street, Cambridge, MA 02138 USA Tel. 617-354-0484 Fax 617-354-0665 http://www.aavso.org * * * AAVSO NEWS FLASH * * * Subject: 0915+51 SN 1999BY 1801-27 V4444 SGR No. 433 1617-55 IK NOR 1805-14 UZ SER May 6, 1999 ---------------------------------------------------------------------------- 0915+51 SN 1999by Below is an update on the new supernova SN 1999by: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 30.838 15.7: CCD BEN MAY 04.956 14.1 GRL MAY 03.875 14.0 OJR MAY 05.1806 14.0 CCDV RR MAY 03.8896 14.3 CMG MAY 05.204 13.6 MRV MAY 03.958 14.3 MOK MAY 05.87 13.7 KTO MAY 03.981 14.5C TRO MAY 05.8780 13.6: SJZ MAY 04.005 <13.8 GRL MAY 05.974 13.7 GRL MAY 04.207 14.0 MRV MAY 05.989 14.1 OJR MAY 04.86 13.5 KTO ---------------------------------------------------------------------------- 1617-55 IK NORMAE The dwarf nova type cataclysmic variable IK NOR may be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 04.4104 <14.5 SRX MAY 06.5076 14.3 SRX MAY 06.4264 14.2 SRX According to the AAVSO International Database this star is fainter than visual magnitude 15.5 during quiescence. ---------------------------------------------------------------------------- 1801-27 V4444 SAGITTARII (N SGR 99) Beow is an update on the new, bright nova v4444 Sgr (N Sgr 99): AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 30.712 8.9 MMZ MAY 03.1236 9.7 PPB APR 30.920 9.2 MLF MAY 03.1250 10.1 KHL MAY 01.2854 9.4 GRI MAY 03.403 10.0 MRV MAY 01.405 9.5 MRV MAY 03.5000 9.8 CVR MAY 01.5417 9.4 SRX MAY 03.5701 10.0 SRX MAY 01.640 9.6 PEX MAY 04.3951 10.7: BVE MAY 01.971 9.5 MLF MAY 04.399 10.3 MRV MAY 02.1701 10.0 NTA MAY 04.6000 10.2 CVR MAY 02.3380 9.78 CCDV ZRE MAY 05.385 10.5 MRV MAY 02.399 9.8 MRV MAY 06.5917 10.6 SRX ---------------------------------------------------------------------------- 1805-14 UZ SERPENTIS The dwarf nova type (possible Z CAM subclass) cataclysmic variable UZ SER may be in outburst, as indicated by the following observation: AAVSO Observer UT Mag. Initials MAY 06.5042 13.4 SRX According to the AAVSO International Database this star is fainter than visual magnitude 14.9 during quiescence. ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BEN - E. BERKO, HUNGARY MRV - R. MODIC, USA BVE - E. VAN BALLEGOY, NETHERLANDS NTA - T. NAPOLEAO, BRAZIL CMG - G. COMELLO, NETHERLANDS OJR - J. OSORIO, SPAIN CVR - R. CARVER, AUSTRALIA PEX - A. PEARCE, AUSTRALIA GRI - J. GRIESE III, USA PPB - P. PECORELLI, ARGENTINA GRL - B. GRANSLO, NORWAY RR - R. ROYER, USA KHL - M. KOHL, SWITZERLAND SJZ - J. SPEIL, POLAND KTO - T. KINNUNEN, FINLAND SRX - R. STUBBINGS, AUSTRALIA MLF - L. MONARD, SOUTH AFRICA TRO - O. TRONDAL, NORWAY MMZ - M. MATTIAZZO, AUSTRALIA ZRE - R. ZISSELL, USA MOK - O. MIDTSKOGEN, NORWAY Please monitor these and other variable stars closely and phone-in, fax, or e-mail your observations to the AAVSO. Good observing! Janet A. Mattei, Director Rebecca Pellock, Technical Assistant ____________________________________________________________________________ Symbols may include: < = fainter than magnitude given (variable not seen) : = uncertain CCDV = Charge-coupled device with (V) filter If you would like to contribute to AAVSO NEWS FLASH, please send observations of unusual variable star activity to: observations@aavso.org Those who wish to subscribe (free of charge) or unsubscribe to NEWS FLASH may do so by visiting the following web page: http://www.aavso.org If you would like data from the AAVSO International Database for research purposes, please send your request to: Janet Mattei, AAVSO Director, at aavso@aavso.org An archive of past issues of the News Flash is available at the following web page: http://www.aavso.org/newsflash/ We look forward to including your observations in future editions of AAVSO NEWS FLASH! ____________________________________________________________________________