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Alert Notice 158: Supernova in NGC 4411B AND Successful launch of NASA's Extreme Ultraviolet Explorer and detection of first light

THE AMERICAN ASSOCIATION OF VARIABLE STAR OBSERVERS
25 Birch Street, Cambridge, MA 02138 USA
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Tel. 617-354-0484 FAX 617-354-0665

AAVSO ALERT NOTICE 158 (July 2, 1992)

SUPERNOVA IN NGC 4411B

We have been informed by Robert O. Evans (Hazelbrook, Australia), Chairman of the AAVSO Supernova Search Committee, and the Central Bureau for Astronomical Telegrams (IAU Circular 5552) of the visual discovery by Robert Evans of a supernova in NGC 4411B on July 1.375 UT at magnitude approximately 13.5. The supernova was visually confirmed by Thomas Cragg (Anglo-Australian Telescope, Coonabarabran, Australia) on July 2.4 UT.

The supernova is situated 40 seconds east and 40 seconds south of the nucleus of the galaxy. The supernova's 1950 position, measured by Robert NcNaiught (Anglo-Australian Observatory), is:

R.A. 12 24 17.04   Dec. +09 09 14.2

There is a magnitude 13.0 star on the northwest side of the galaxy at R.A. 12 24 10.24, Dec. +09 10 24.4.

IAU Circular 5552  reports that spectroscopic observations at the AAT on July 2 exhibited "hydrogen Balmer lines with characteristic P-Cyg line progiles, indicating a type-II supernova."

Accompanying are finder charts of the field from the Photographic Atlas for Supernova Search, Volume II, by Manuel Lopez Alvarez, and from the AAVSO Variable Star Atlas. Also accomanying is the AAVSO 'c'  scale chart gfor R Vir, which is fairly close to the galaxy.

Our congratulations to Bob on his first discovery of 1992!

SUCCESSFUL LAUNCH OF NASA's EXTREME ULTRAVIOLET EXPLORER AND DETECTION OF FIRST LIGHT

NASA's Extreme Ultraviolet Explorer (EUVE) was successfully launched on June 7, 1992, from Cape Canaveral in Florida on a Delta rocket. All seven detectors of the EUVE observatory were turned on successfully on June 21, and the first EUV sky images were obtained. The satellite will begin its survey in late July. Together with the EUVE Science Team, we have finalized the targets that variable star observers worldwide will be monitoring for EUVE. All observers will be informed of these targets and finder chart information for them very soon. Please keep a close eye on observable cataclysmic variables, as most of the objects on our EUVE observing list are cataclysmic variables.

Thank you very much for your efforts and your observations. Good observing!

Janet A. Mattei
Director

files: [all charts on one page]  SN in NGC 4411B - small charts from AAVSO Variable Star Atlas and Photographic Atlas for Supernovae Search Vol. II; R Vir 'c' scale chart

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