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IAUC 7881: 2002ci; 2002cg; 2002ch; C/2002 F1

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IAUC number

                                                  Circular No. 7881
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVA 2002ci IN UGC 10301
     P. Martin and W. D. Li, University of California at Berkeley
(UCB), report the LOTOSS (cf. IAUC 7514) discovery of an apparent
supernova on unfiltered CCD images taken with the 0.8-m Katzman
Automatic Imaging Telescope (KAIT) on Apr. 19.5 (mag about 17.2)
and 20.4 UT (mag about 17.1).  SN 2002ci is located at R.A. =
16h15m37s.95, Decl. = +31o19'17".4 (equinox 2000.0), which is 2".0
east and 0".1 north of the nucleus of UGC 10301.  A KAIT image
taken on Apr. 4.5 showed nothing at this position (limiting mag
about 19.0).  R. Chornock, W. D. Li, and A. V. Filippenko, UCB,
report that inspection of CCD spectra (range 330-1000 nm) obtained
on Apr. 20 with the Shane 3-m reflector at Lick Observatory reveals
that the object is a supernova of type Ia.  The spectral-feature
age (cf. IAUC 7774) is -1 +/- 2 days relative to maximum light.
Strong Na I D absorption at the redshift of the host galaxy (0.4-nm
equivalent width) implies that this object may be somewhat reddened.

SUPERNOVA 2002cg IN UGC 10415
     T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum (range
370-750 nm) of SN 2002cg (cf. IAUC 7877), obtained by M. Calkins on
Apr. 15.36 UT with the F. L. Whipple Observatory 1.5-m telescope (+
FAST spectrograph), shows it to be a supernova of type I, but the
exact classification is uncertain.  It resembles SN 2002ap about a
month past discovery.  Chornock et al. remark that spectra
(obtained at Lick Observatory, as above) indicate that SN 2002cg is
a relatively normal supernova of type Ic.

     Chornock et al. also note that spectra (obtained as above)
show that SN 2002ch (IAUC 7879) is a type-II supernova.  Broad
H-alpha emission greatly dominates over the absorption component.
A redshift of approximately 10 200 km/s is derived from narrow
nebular emission lines associated with the host galaxy.

     Visual m_1 estimates (B = binoculars):  Apr. 9.13 UT, 6.6 (K.
Hornoch, Lelekovice, Czech Republic, 10x80 B); 11.38, 5.6 (J.
Bortle, Stormville, NY, 10x50 B); 16.12, 4.1 (W. Hasubick, Buchloe,
Germany, 10x50 B); 19.09, 4.5 (B. H. Granslo, Fjellhamar, Norway,
7x50 B).

                      (C) Copyright 2002 CBAT
2002 April 21                  (7881)            Daniel W. E. Green

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