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IAUC 7911: C/2002 K4; 2002cv

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                                                  Circular No. 7911
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)


COMET C/2002 K4 (NEAT)
     Additional observations (cf. IAUC 7909) and the following
preliminary parabolic orbital elements appear on MPEC 2002-K69:

     T = 2002 Aug.  8.013 TT          Peri. =  32.810
                                      Node  = 308.814   2000.0
     q = 2.74229 AU                   Incl. =  95.939


SUPERNOVA 2002cv IN NGC 3190
     P. Meikle and S. Mattila, Imperial College, London, report
that infrared magnitudes of SN 2002cv obtained by A. Glasse at the
U.K. Infrared Telescope (UKIRT) on May 17.3 UT (H = 14.3, K = 13.9)
indicate a brightening since May 13.8 (cf. IAUC 7901).  Infrared
spectra (range 0.83-1.35 and 1.98-2.5 microns) were obtained by J.
Buckle at the UKIRT on May 22.3 and 23.3.  A spectrum covering
bands I and J (and of fairly low S/N) shows a continuum declining
by about 30 percent from the short- to long-wavelength limits.  No
strong features are present.  The K-band spectrum (with good S/N)
shows a number of broad, prominent emission/absorption features
superimposed on a continuum that declines toward longer wavelengths.
The presence of these features means that the infrared spectrum is
not that of a type-II supernova.  An infrared spectrum (range
0.83-2.5 microns) of the type-Ia SN 2002bo (IAUC 7846), also in NGC
3190, was obtained at the UKIRT by A. Adamson on Apr. 3.3, about 10
days after maximum light (B-band); by reddening the SN 2002bo
infrared spectrum relative to that of SN 2002cv, by an absolute
V-band extinction of A(V) about 6 (using the extinction law of
Cardelli et al. 1989, Ap.J. 345, 245), the two infrared spectra
become quite similar in appearance, with SN 2002cv being about 0.4
mag brighter than the dereddened SN 2002bo.  Meikle and Mattila add:
"We conclude that the absolute (d = 22 Mpc) dereddened magnitudes
of SN 2002cv (cf. Meikle 2000, MNRAS 314, 782) and the appearance
of its infrared spectra indicate a type-Ia event with maximum light
(B-band) around May 23.  Given the earlier, higher-temperature
epoch of the SN 2002cv infrared spectra, compared with SN 2002bo,
it is likely that the value A(V) toward SN 2002cv actually exceeds
6, making this probably the highest ever recorded for an identified
type-Ia supernova.  Unlike SN 2002bo, the SN 2002cv I-band spectrum
does not show strong Ca II triplet emission/absorption.  However,
weak Ca II has been observed in some type-Ia supernovae such as the
peculiar SN 1991T at maximum light."

                      (C) Copyright 2002 CBAT
2002 May 29                    (7911)            Daniel W. E. Green

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