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IAUC 7497: P/2000 S1; 2000dm

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                                                  Circular No. 7497
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 P/2000 S1 (SKIFF)
     Prediscovery observations made by LINEAR on Aug. 26, together
with additional astrometry on Sept. 26, are given on MPEC 2000-S60,
along with the following orbital elements:

     T = 2000 July  8.217 TT          Peri. = 305.699
     e = 0.62614                      Node  =  29.547   2000.0
     q = 2.48410 AU                   Incl. =  20.689
       a =  6.64442 AU     n = 0.057547     P =  17.13 years

2000 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Sept.13     0 40.61   -15 22.3   1.588   2.550  158.1    8.5   15.1
     23     0 32.32   -14 41.8   1.593   2.570  163.3    6.4   15.1
Oct.  3     0 23.71   -13 46.3   1.624   2.593  161.9    6.9   15.2
     13     0 15.86   -12 35.3   1.680   2.619  155.1    9.2   15.3
     23     0 09.62   -11 10.6   1.762   2.647  146.1   12.1   15.5


SUPERNOVA 2000dm IN UGC 11198
     S. Jha, P. Challis, T. Matheson, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that spectra of SN
2000dm (cf. IAUC 7495), obtained by Z. Balog on Sept. 25.1 UT with
the F. L. Whipple Observatory 1.5-m telescope (+ FAST spectrograph),
show it to be a type-Ia supernova at maximum light.  The spectra
exhibit a blue continuum and Si II, S II, Fe II, Mg II, and Ca II
features.  Adopting the NASA/IPAC Extragalactic Database recession
velocity of 4507 km/s for the host galaxy yields an expansion
velocity for the supernova of 10 800 km/s, measured with the Si II
(rest 635.5 nm) profile.  The age of the supernova based on its
spectral features (Riess et al. 1997, A.J. 114, 722) is 1 +/- 2
days before maximum light.  The spectrum also shows significant
interstellar Na I D absorption (equivalent width = 0.1 nm) from our
Galaxy, and the reddening towards this direction is estimated to be
E(B-V) = 0.19 mag (Schlegel et al. 1998, Ap.J. 500, 525).
     A. V. Filippenko and R. Chornock, University of California at
Berkeley, also write:  "Inspection of CCD spectra (range 330-1000
nm) of SN 2000dm, obtained on Sept. 26 UT with the Shane 3-m
reflector at Lick Observatory, reveals that the object is a normal
type-Ia supernova very close to maximum brightness.  The presence
of interstellar Na I absorption suggests that SN 2000dm is somewhat
reddened."

                      (C) Copyright 2000 CBAT
2000 September 26              (7497)            Daniel W. E. Green

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