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: 0611+15 CZ ORI 1805-14 UZ SER No. 778 0804+28 YZ CNC 1818-24 GU SGR May 3, 2001 1552+72 SS UMI ---------------------------------------------------------------------------- 0611+15 CZ ORIONIS The dwarf nova type (UG subclass) cataclysmic variable CZ ORI appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 26.8319 <13.6 RMQ MAY 01.3829 12.6 SRX ---------------------------------------------------------------------------- 0804+28 YZ CANCRI The dwarf nova type (SU UMA subclass) cataclysmic variable YZ CNC is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials MAY 02.1194 <13.5 DPL MAY 03.2138 12.5 BTH MAY 02.2075 <12.8 BTH MAY 03.2875 12.4 LMK MAY 02.8708 14.5 RMQ ---------------------------------------------------------------------------- 1552+72 SS URSAE MINORIS The dwarf nova type (SU UMA subclass) cataclysmic variable SS UMI is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 22.9273 17.08 DRG APR 29.1902 <13.2 SXN APR 23.9190 <15.4 PYG APR 30.0070 15.4 PYG APR 24.9292 <15.8 RMQ APR 30.0243 <14.7 DPV APR 24.9330 <15.4 PYG APR 30.0534 <14.7 RMQ APR 25.9219 <15.4 PYG APR 30.9229 <14.5 PYG APR 26.9068 <15.4 RMQ MAY 01.0410 15.8: RMQ APR 28.0117 <15.4 RMQ MAY 01.9056 14.5 DPV APR 28.8667 15.5 RMQ MAY 02.0117 14.8 RMQ APR 28.9240 <15.4 PYG MAY 02.9152 15.1 RMQ APR 28.9306 15.4 RMQ ---------------------------------------------------------------------------- 1805-14 UZ SERPENTIS The dwarf nova type (possible Z CAM subclass) cataclysmic variable UZ SER appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 30.4500 <15.9 CCDV JM MAY 01.6099 <13.8 SRX APR 30.5770 <13.8 SRX MAY 02.8530 13.0 PEX ---------------------------------------------------------------------------- 1818-24 GU SAGITTARII The R CRB type variable GU SGR appears to be fading, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 15.2714 <12.4 OSE APR 30.6080 <14.2 SRX APR 16.3305 14.3 CCDV OCN APR 30.8470 <14.5 PEX APR 20.3555 14.3 CCDV OCN MAY 02.8349 <14.6 PEX APR 25.6219 <14.2 SRX According to observations in the AAVSO Inernational Database, the last fading of GU SGR began between December 1987 and February 1988, faded to as faint as visual magnitude 16.3:, and finally returned to full maximum at visual magnitude 10.4 in February 1993. Since then it has been observed around maximum until the current fading. ---------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BTH - T. BURROWS, USA OSE - S. OTERO, ARGENTINA DPL - P. DOMBROWSKI, USA PEX - A. PEARCE, AUSTRALIA DPV - P. DUBOVSKY, SLOVAKIA PYG - G. POYNER, ENGLAND DRG - R. DIETHELM, SWITZERLAND RMQ - M. RESZELSKI, POLAND JM - R. JAMES, USA SRX - R. STUBBINGS, AUSTRALIA LMK - M. LINNOLT, USA SXN - M. SIMONSEN, USA OCN - S. O'CONNOR, CANADA Please monitor these and other variable stars closely and phone-in, fax, or e-mail your observations to the AAVSO. Good observing! Kerri Malatesta, Technical Assistant On behalf of Janet A. Mattei, Director ____________________________________________________________________________ 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! ____________________________________________________________________________