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IAUC 7915: 2002df; 2002dg; 2002db; 2002de

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IAUC number 

                                                  Circular No. 7915
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


SUPERNOVA 2002df IN MCG -01-53-6
     M. Papenkova and W. D. Li, University of California at
Berkeley, report the LOTOSS (cf. IAUC 7906) discovery of an
apparent supernova on unfiltered CCD images taken with the 0.8-m
Katzman Automatic Imaging Telescope (KAIT) on June 2.5 (mag about
17.4) and 3.5 UT (mag about 17.1).  SN 2002df is located at R.A. =
20h45m39s.33, Decl. = -4 57'04".7 (equinox 2000.0), which is 27".1
west and 4".2 south of the nucleus of MCG -01-53-6.  A KAIT image
of the same field on May 10.5 showed nothing at this position
(limiting mag about 18.5).


SUPERNOVA 2002dg
     Further to IAUC 7905, W. M. Wood-Vasey, G. Aldering, and P.
Nugent report the discovery of another apparent supernova (mag
18.5) on unfiltered NEAT images taken with the Palomar 1.2-m
Schmidt telescope on May 31.3 and June 3.2 UT.  SN 2002dg is
located at R.A. = 14h57m16s.29, Decl. = +5 54'00".6 (equinox
2000.0), which is 4" east of the apparent host galaxy.  No object
is apparent at this position on NEAT images from 2002 May 5
(limiting mag 21.5; S/N = 3) or 2001 July 21 (limiting mag 20.5).


SUPERNOVA 2002db IN NGC 5683
     T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum (range
370-750 nm) of SN 2002db (cf. IAUC 7906), obtained by M. Calkins on
June 1.29 UT with the F. L. Whipple Observatory 1.5-m telescope (+
FAST spectrograph), shows it to be a type-Ia supernova near maximum.
Adopting the NASA/IPAC Extragalactic Database (NED) recession
velocity of 10859 km/s for the host galaxy, the supernova expansion
velocity is about 12200 km/s for Si II (rest 635.5 nm).  The
spectral-feature age of the supernova was 2 +/- 2 days before
maximum light.


SUPERNOVA 2002de IN NGC 6104
     Matheson et al. also report that a spectrum (range 370-750 nm)
of SN 2002de (cf. IAUC 7914), obtained by Calkins as above on June
2.23 UT, shows it to be a type-Ia supernova before maximum.
Adopting the NED recession velocity of 8428 km/s for the host
galaxy, the supernova expansion velocity is about 12000 km/s for Si
II (rest 635.5 nm).  The spectral-feature age of the supernova was
4 +/- 2 days before maximum light.

                      (C) Copyright 2002 CBAT
2002 June 4                    (7915)            Daniel W. E. Green

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