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THE ASTRONOMER Electronic Circular No 1497      2000 Feb 15 07.39UT
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.demon.co.uk/astronomer
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SUPERNOVA 2000H IN IC 454
The supernova candidate found by Mark Armstrong has now been
confirmed (cf E1495):

     P. Garnavich, University of Notre Dame; and P. Challis, S.
Jha, and R. Kirshner, Harvard-Smithsonian Center for Astrophysics,
report that a spectrum of SN 2000H was obtained by K. Rines on Feb.
9.2 UT with the F. L. Whipple Observatory 1.5-m telescope, showing
it to be a type-Ia supernova.  The characteristic Si II 615-nm
absorption is present, but with a pronounced asymmetric profile,
being very steep on the red side of the line.  Assuming a recession
velocity of 4170 km/s, based on the narrow emission from the host
galaxy, the photospheric velocity from the Si II absorption minimum
is only -4100 km/s.  The 580-nm feature is deep relative to the Si
II, which suggests that this is a subluminous, fast-declining event.
The peak observed magnitude of 17 (IAUC 7361) also suggests a very
low luminosity for a type-Ia event.
IAUC 7366 (extract)

Guy M Hurst