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IAUC 7505: 2000dr; 2000dp; C/1999 T1

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                                                  Circular No. 7505
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 2000dr IN IC 1610
     M. Modjaz, D. Weisz, and W. D. Li, University of California at
Berkeley, on behalf of the Lick Observatory Supernova Search (cf.
IAUC 6627, 7126), report the discovery with the 0.8-m Katzman
Automatic Imaging Telescope (KAIT) of an apparent supernova on
unfiltered images taken on Oct. 5.3 (mag about 18.1) and 6.3 UT
(mag about 17.8).  The new object is located at R.A. =
1h01m44s.04, Decl. = -15o34'09".1 (equinox 2000.0), which is 20".9
east and 5".5 south of the nucleus of IC 1610.  A KAIT image of the
same field taken on Sept. 27.3 UT showed nothing at the position of
SN 2000dr (limiting mag about 19.0).

SUPERNOVA 2000dp IN NGC 1139
     T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report:  "A spectrum of SN
2000dp (cf. IAUC 7503), obtained by P. Berlind on Oct 4.38 UT with
the F. L. Whipple Observatory 1.5-m telescope (+ FAST spectrograph),
shows it to be a type-Ia supernova at maximum light.  The spectrum
exhibits a blue continuum, with well-defined Si II, S II, Fe II, Mg
II, and Ca II features.  From a separate exposure of the nucleus,
we derive a recession velocity for NGC 1139 of 10 350 km/s.  The
supernova expansion velocity is 12 700 km/s for Si II (rest 635.5
nm).  The spectral feature age of the supernova (Riess et al. 1997,
A.J. 114, 722) is 0 +/- 2 days before maximum light."
     A. V. Filippenko and R. Chornock, University of California at
Berkeley, report that inspection of CCD spectra (range 330-780 nm)
of SN 2000dp obtained on Oct. 6 UT with the Shane 3-m reflector at
Lick Observatory reveals that the object is a normal type-Ia
supernova, 3 +/- 2 days past maximum brightness (using the spectral
feature aging method of Riess et al., op. cit.).  Cross-correlation
of the spectrum with that of type-Ia SN 1994D at a similar epoch
yields a redshift (cz) of about 10 000 km/s.

     Total visual magnitude estimates:  Sept. 23.85 UT, 9.9 (A.
Pearce, Nedlands, W. Australia, 0.20-m reflector); Oct. 2.71, 9.6
(D. A. J. Seargent, The Entrance N.S.W., 25x100 binoculars); 4.81,
9.8 (Pearce); 6.29, 10.0: (A. Amorim, Florianopolis, Brazil, 0.14-m

                      (C) Copyright 2000 CBAT
2000 October 7                 (7505)            Daniel W. E. Green

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