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THE ASTRONOMER Electronic Circular No 2687      2010 Nov 10 12.28UT
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 2010jn IN NGC 2929
The Central Bureau has received reports of the independent discoveries 
of an apparent supernova in NGC 2929 on unfiltered CCD images -- the 
first by Tom Boles (Coddenham, England, 0.35-m reflector) recorded on 
2010 Oct 21 at magnitude 17.0 during searches for the UK Nova/Supernova 
Patrol, and the second by Jack Newton and Tim Puckett (0.40-m reflector 
at Portal, AZ, U.S.A.). Tom reports the position of 2010jn as: RA 09h 
37m 30.24s DEC +23o 09' 33.3" (2000), which is approximately 5.9"E and 
8.7"S of the centre of the host galaxy's nucleus.

Available magnitudes, from unfiltered CCD images: 1995 Nov. 30, [21.0 
(Digitised Sky Survey, blue via Boles); 1998 Apr. 22, [20.5 (DSS, red; 
via Boles); 2009 Jan. 6, [19.5 (Boles); 2009 Oct. 4, [19.9 (Puckett); 
2010 Oct. 21.160, 17.0 (Boles; discovery); Nov. 5.47, 17.2 (Newton and 
Puckett; discovery); 6.48, 16.9 (Puckett).
Tom Boles subsequently noted that 2010jn was reported by Howell et
al. on 'The Astronomer's Telegram 2934', where they reported position 
end figures 30.30s, 33.6" and the following R-band
magnitudes:  Oct. 8.5, [20.3; 11.5, 19.6 (marginal); 12.5, 19.2
discovery); 13.5, 18.7.  Howell et al. add that a spectrogram obtained 
on Oct. 13 with the "Gemini North" telescope showed 2010jn to be a 
type-Ia supernova around 15 days before maximum light, noting that the 
blueshift of the Si II 635.5-nm feature indicates velocities in excess 
of 20000 km/s ("among the highest ever seen for non-detached features" 
in a type-Ia event).

Congratulations to Tom on the discovery of his 137th supernova.

Guy Hurst