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THE ASTRONOMER Electronic Circular No 2688      2010 Nov 16 19.48UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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SUPERNOVA 2010js IN UGC 4294
We received an e-mail from Tom Boles advising that he had recorded a 
suspected supernova of magnitude 18.1 on 2010 Nov 7.075UT in UGC 4294 
during searches for the UK Nova/Supernova Patrol. The discovery was made 
with a 0.35-m Schmidt-Cassegrain telescope on an unfiltered CCD 
exposure. Confirmation was subsequently obtained with the Sierra Stars 
0.61-m Cassegrain telescope on Nov 9.544UT.

The new object is located at:
RA 08h 16m 49.66s DEC +60 29' 46.1" (2000), which is approximately 2.6"E 
and 11.2"N of the centre of the host galaxy.

Nothing is present at this position on Tom's images of 2010 Jan 17 and 
Mar 4 (limiting mag 19.5) or on Digitised Sky Survey Plates from 
1989-12-21 (limiting red mag 20.5), and 1990-01-01 (limiting blue mag 
21.0).

P. Challis and R. Kirshner, Harvard-Smithsonian Center for Astrophysics 
(CfA); and N. Smith, University of Arizona, on behalf of the CfA 
Supernova Group, report on CBET 2548 that spectroscopic observation of 
2010js shows the symmetric Balmer lines with widths of approximately 
4000 km/s (FWZI) seen in type-IIn supernovae; the redshift for this 
object in UGC 4294 is z = 0.039.

The object was announced on CBET 2546 on Nov 14 and designated SN 
2010js. Congratulations to Tom on the discovery of his 138th supernova.

Guy M Hurst