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THE ASTRONOMER Electronic Circular No 2377      2007 Sep 18 15.04UT
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 2007iv IN UGC 12917
Tom Boles, Coddenham, England e-mailed us on September 17 to report that 
he had found a possible supernova in the galaxy UGC 12917 during 
searches for the UK Nova/Supernova Patrol.

The new object is very faint at magnitude 19.6 and was recorded on two 
nights: 2007 Sept 14.995UT and 16.051UT using a 0.35-m 
Schmidt-Cassegrain telescope and unfiltered CCD images.

The new object is located at:
RA 00h 01m 53.22s DEC +40 20' 19.2"(2000), which is approximately 11.0" 
east and 7.3" north of the centre of the host galaxy.
On the second night end figures of RA 53.24s and ra 19.0" were derived.

As the object was particularly faint, Tom asked Weidong Li for 
additional confirmation which was obtained using the KAIT on Sept. 
16.379UT.

The suspect is not present on Tom's images of 2006 Nov 20 and 2007 Aug 4 
(limit mag 19.5) and a composite master image (limiting mag 21.0). It 
was also not recorded on DSS II red (1989-08-30
limiting mag 20.5), blue plates (1989-10-04 limiting mag 21.0).

The designation was added on CBET 1070 issued today. Congratulations to 
Tom on the discovery of his 108th supernova.

Guy M Hurst