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			THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
				25 Birch Street, Cambridge, MA 02138 USA 
				BITNET: aavso@cfa8 SPAN: nssdca::cfa8::aavso
					Tel. 617-354-0484 FAX 617-354-0665

				AAVSO ALERT NOTICE 144 (May 6, 1991)

SUPERNOVA IN NGC 4902

Robert McNaught, Anglo-Australian Telescope, informs us of the discovery of a 
supernova in NGC 4902 by AAVSO member Robert O. Evans, Hazelbrook, Australia. 
The discovery was made on May 5.49 UT at visual magnitude 13.5-14. The supernova 
is offset from the nucleus of the galaxy 13.9" east, 10.7" north. The position 
of the supernova (1950.0, from R. McNaught) is:

			RA 12h 58m 22.55s	Decl. -14deg 14' 29.8"

According to McNaught, "The supernova ... is situated just on the edge of the 
bar and inside the ring" of the galaxy. Please use the accompanying AAVSO 
preliminary "d" scale chart of SV Vir and the Thompson/Bryan chart of NGC 4856 
for sequences for observing the supernova, and report your observations to 
AAVSO HQ so we may forward them to the Central Bureau for Astronomical Telegrams.

Our congratulations to Bob on his latest discovery!

MONITORING OF 1910-33 RY SAGITIARII

Observers are reminded of the upcoming observing run with the IUE on R Y Sgr (see 
AAVSO Alert Notice 138). This R Coronae Borealis star is gradually returning to 
maximum light after its recent minimum. Please monitor R Y Sgr throughout the 
month of May, particularly on May 22 and 31, when the IUE observations will be 
made, and please telephone your estimates in on May 20 and May 29, so we may 
inform the astronomers.

The AAVSO HQ answering machine (617-354-0484) is on nights and weekends. Thank 
you very much for your efforts and astronomical contributions.

Clear Skies! Good Observing!

Janet A. Mattei
Director