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IAUC 7922: 2002dn; 2002dg; C/2002 L6

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IAUC number 

                                                  Circular No. 7922
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 2002dn IN IC 5145
     W. D. Li, University of California at Berkeley (UCB), reports
the LOTOSS (cf. IAUC 7906) discovery of a supernova on unfiltered
KAIT CCD images taken on June 15.5 (mag about 18.6) and 17.5 UT
(mag about 18.7).  SN 2002dn is located at R.A. = 21h54m22s.47,
Decl. = +15o09'42".2 (equinox 2000.0), which is 8".8 west and 18".3
north of the nucleus of IC 5145.  A KAIT image taken on May 31.5
showed nothing at this position (limiting mag about 19.0).  A. V.
Filippenko, R. Chornock, and R. J. Foley (UCB) report that
inspection of a CCD spectrum (range 330-1000 nm), obtained on June
17 UT with the Shane 3-m reflector at Lick Observatory, shows that
SN 2002dn is a supernova, probably of type Ic, resembling SN 1987M
about 1-2 weeks past maximum brightness (Filippenko et al. 1990,
A.J. 100, 1575).  The Ca II near-infrared triplet and O I 777.4-nm
troughs are strong, and the Si II 635.5-nm absorption line is
unusually prominent for a type-Ic object.


SUPERNOVA 2002dg
     M. Riello, S. Benetti, G. Altavilla, A. Pastorello, and M.
Turatto, Osservatorio Astronomico di Padova; E. Cappellaro,
Osservatorio Astronomico di Capodimonte, write:  "A spectrum (range
400-975 nm, resolution 1.0 nm) of SN 2002dg (cf. IAUC 7915),
obtained on June 15.13 UT with the European Southern Observatory's
New Technology Telescope (+ EMMI) at La Silla, shows that it is a
type-Ib supernova, 2-3 weeks after maximum.  The spectrum closely
resembles that of SN 1999dn at the same epoch, although the
absorption at 627.8 nm (rest frame) possibly due to H-alpha (Branch
et al. 2002, Ap.J. 566, 1005) appears stronger.  The expansion
velocity, measured from the He I absorptions, is about 8400 km/s,
while that deduced from H-alpha is about 13000 km/s (the recession
velocity measured from the parent galaxy emission lines is 14000
km/s)."


COMET C/2002 L6 (SOHO)
     Further to IAUC 7919, D. Hammer reports measurements of an
additional Kreutz-sungrazing comet found by D. Hanson on SOHO
website C2 images.  Reduced astrometry and orbital elements by B.
G. Marsden appear on MPEC 2002-L65.

    Comet         2002 UT           R.A. (2000) Decl.
    C/2002 L6     June  8.229       5 02.4   +20 58

                      (C) Copyright 2002 CBAT
2002 June 17                   (7922)            Daniel W. E. Green

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