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IAUC 8151: C/2003 L2; 2002ic; 2003ga

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IAUC number

                                                  Circular No. 8151
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)

     An apparently asteroidal object found by LINEAR (discovery
observation below), and posted on the NEO Confirmation Page, has
been found to be cometary on CCD images taken by S. Sanchez, R.
Stoss, and J. Nomen (Mallorca, 0.30-m f/9 reflector; 10" coma on
June 12.95 UT) and by S. Gajdos (Modra, 0.6-m f/5.5 reflector;
diffuse with coma diameter about 5" on June 13.97; m_1 = 18.0).

     2003 UT             R.A. (2000) Decl.        m2
     June 12.32879   19 30 27.04   +56 54 17.6   18.2

The available astrometry, the following preliminary parabolic
orbital elements, and an ephemeris appear on MPEC 2003-L55.

     T = 2004 Feb. 14.914 TT          Peri. = 139.542
                                      Node  = 272.220   2000.0
     q = 2.25126 AU                   Incl. =  81.546

     M. Hamuy and M. Phillips, Carnegie Observatories; N. Suntzeff,
Cerro Tololo Inter-American Observatory; and J. Maza, University of
Chile, report that spectroscopic observations (range 380-930 nm) of
SN 2002ic (cf. IAUC 8019), obtained between 2002 Nov. 29 and 2003
Jan. 27 with the Baade telescope (+ Boller & Chivens spectrograph)
and the Dupont telescope (+ WFCCD), show a persistent, strong
H_alpha emission and a weaker H_beta emission.  The H_alpha profile
exhibits a double component, one unresolved (FWHM < 300 km/s) and
the other with FWHM about 1800 km/s -- both of which remained
strong over the first two months of evolution.  This feature is
reminiscent of type-IIn supernovae and suggests that this is the
first detection of interaction between the ejecta of a type-Ia
supernova (cf. IAUC 8028) and a hydrogen-rich circumstellar medium.
Hamuy et al. add that SN 2002ic is about to reappear from behind
the sun, so further observations are urged in order to check or
rule out this possibility.

     Further to IAUC 8148, R. Ellis et al. report that a spectrum
of SN 2003ga (cf. IAUC 8149), obtained on June 2 with the Keck I
telescope, shows it to be an early type-II supernova with a
featureless blue spectrum (and galaxy redshift 0.29).

                      (C) Copyright 2003 CBAT
2003 June 14                   (8151)            Daniel W. E. Green

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