THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS 25 Birch Street, Cambridge, MA 02138 USA Tel. 617-354-0484 Fax 617-354-0665 INTERNET: aavso@aavso.org * * * AAVSO NEWS FLASH * * * Subject: UU Aql, GO Com, V516 Cyg, X Leo, RZ LMi, No. 289 CN Ori, V1159 Ori, UY Pup, UZ Ser April 22, 1998 ____________________________________________________________________________ UU AQUILAE The dwarf nova type cataclysmic variable UU Aql is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 08.4910 <15.4 HSG APR 18.4688 12.0 HSG APR 14.0 <12.2 OB APR 20.4674 12.0 HSG APR 17.128 11.3 OB APR 20.6674 11.7 SRX APR 18.402 11.8 MRV APR 21.4542 12.2 HSG ------------------------------------------------------------------------------ GO COMAE BERENICES The dwarf nova type (SU UMa subclass) cataclysmic variable GO Com is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 18.4417 <14.4 HSG APR 20.6527 13.6 SRX APR 18.951 <14.8 PYG APR 20.867 13.7 PYG APR 19.2424 <14.9 HSG APR 20.867 13.7 PYG APR 19.87 13.8: SPK APR 21.1785 13.8 HSG APR 20.4271 13.5 HSG APR 21.4285 13.9 HSG APR 20.4521 13.4 HSG APR 21.4632 13.9 HSG APR 20.4778 13.4 HSG ------------------------------------------------------------------------------ V516 CYGNI The dwarf nova type (SS Cyg subclass) cataclysmic variable V516 Cyg appears to be in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 13.3670 18.09 CCDV ZRE APR 20.4597 14.2 HSG APR 18.4604 14.0 HSG APR 21.4479 14.1 HSG APR 19.4458 14.1 HSG ------------------------------------------------------------------------------ X LEONIS The dwarf nova type cataclysmic variable X Leo is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 19.1681 15.0: HSG APR 21.0701 12.8 BRJ APR 19.2278 14.8 HSG APR 21.074 12.6 CGF APR 19.2549 14.7 HSG APR 21.0799 12.1 TSC APR 19.88 12.0 GUN APR 21.1104 12.4 MKJ APR 20.4347 12.5 SRX APR 21.1840 12.5 HSG APR 20.894 12.3 PYG APR 22.0889 13.3 BRJ ------------------------------------------------------------------------------ RZ LEONIS MINORIS The dwarf nova type (SU UMa subclass) cataclysmic variable RZ LMi is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 21.1 15.1 CGF APR 22.049 13.8 CGF APR 21.1875 15.5: HSG APR 22.0910 14.0 BRJ ------------------------------------------------------------------------------ CN ORIONIS The dwarf nova type (Z Cam subclass) cataclysmic variable CN Ori is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 17.3833 14.0 SRX APR 19.1528 12.7 HSG APR 18.3924 13.0 SRX APR 20.4160 12.5 SRX ------------------------------------------------------------------------------ V1159 ORIONIS The dwarf nova type (SU UMa subclass) cataclysmic variable V1159 Ori is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 15.3146 <14.6 SRX APR 19.1535 14.0: HSG APR 17.3826 13.6 SRX APR 20.4167 14.1 SRX APR 18.3910 14.0 SRX ------------------------------------------------------------------------------ UY PUPPIS The dwarf nova type (Z Cam subclass) cataclysmic variable UY Pup is in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 18.4375 15.0 SRX APR 20.4965 14.2 SRX APR 19.1521 <14.1 HSG APR 21.1715 13.9: HSG APR 20.4403 14.3 SRX ------------------------------------------------------------------------------ UZ SERPENTIS The dwarf nova type (possible Z Cam subclass) cataclysmic variable UZ Ser in outburst, as indicated by the following observations: AAVSO Observer AAVSO Observer UT Mag. Initials UT Mag. Initials APR 14.0 <13.5 OB APR 20.5458 13.2 SRX APR 14.6021 <13.4 SRX APR 20.6590 13.2 SRX APR 19.0 13.5 OB APR 21.037 12.8 OB APR 20.037 13.3 OB APR 21.4521 13.1 HSG ----------------------------------------------------------------------------- We thank the following contributors for the data that they have provided for this News Flash: BRJ - J. Bortle, USA OB - D. Overbeek, South Africa CGF - G. Chaple, USA PYG - G. Poyner, England GUN - J. Gunther, France SPK - P. Schmeer, Germany HSG - G. Hanson, USA SRX - R. Stubbings, Australia MKJ - J. McKenna, USA TSC - S. Tracy, USA MRV - R. Modic, USA ZRE - R. Zissell, USA Please monitor these and other variable stars closely and phone-in, fax, or e-mail your observations to the AAVSO. Good observing! Rebecca Pellock, 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 sending a message to: observations@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 We look forward to including your observations in future editions of AAVSO NEWS FLASH! ____________________________________________________________________________