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THE ASTRONOMER Electronic Circular No 1999      2004 May 24 08.45UT
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             GMH at AST.STAR.RL.AC.UK
WORLD WIDE WEB                         http://www.theastronomer.org
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SUPERNOVA 2004bu IN UGC 10089
On May 19 we received an e-mail from Tom Boles of Coddenham, England in 
which he reported detection of a possible magnitude 17.1 supernova in 
UGC 10089. The object appeared on multiple unfiltered CCD images secured 
for the UK Nova/Supernova Patrol with a 0.35-m Schmidt-Cassegrain 
telescope, but these related to a single night only centred at May 
18.981UT.

He derived the following position from astrometry:
RA 15h 54m 52.03s DEC +21 07'11.0" (2000), 1.2"W and 10.5"N of the 
centre of the parent galaxy.

Tom added that the suspect was not present on his images of 2004 Jan 29 
and Mar 20 (limiting mag 19.5) and it was not found on DSS II red 
(1992.201) or blue plates (1993.316).

In a later e-mail, also received on May 19, Tom relayed that a 
confirmatory image of the suspect had been obtained on May 19.896UT. The 
end figures from the second night were RA: 52.04s, DEC 10.7".

Although an announcement was made on Electronic Telegram 67 by the 
Central Bureau on May 20 designating the object as supernova 2004bu, an 
IAU Circular has not yet been received.

Congratulations to Tom on the discovery of his 65th supernova.

Jean-Marie Llapasset, France has relayed via VSNET an unfiltered red CCD 
magnitude for this object obtained by Joel Nicolas, Observatory 
Vallauris, France. On May 21.873UT, the measurement was 16.1.

Hitoshi Yamaoka, Japan reports that the galaxy is an edge-on spiral 
(Scd:) galaxy.  The expected maximum for a typical SN Ia is mag about 
16.2.

Guy M Hurst