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IAUC 7535: 2000ez; 2000fa; C/2000 W1

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                                                  Circular No. 7535
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 2000ez IN NGC 3995
     T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that spectra of SN
2000ez (cf. IAUC 7533), obtained by J. Huchra on Dec. 3.49 UT with
the F. L. Whipple Observatory 1.5-m telescope (+ FAST spectrograph)
and by N. Caldwell on Dec. 3.53 with the MMT 6.5-m telescope (+
Blue Channel spectrograph), show it to be a type-II supernova
several days after maximum light.  The spectra consist of a
continuum with superposed P-Cyg lines of H, He, and Ca II.
Adopting the NASA/IPAC Extragalactic Database recession velocity of
3254 km/s for the host galaxy, the expansion velocity derived from
the minimum of the H-beta line is 4000 km/s.


SUPERNOVA 2000fa IN UGC 3770
     Matheson et al. also report that spectra of SN 2000fa,
obtained as above by Huchra on Dec. 3.46 UT and by Caldwell on Dec.
3.43, show it to be a type-Ia supernova well before maximum light.
The spectra consist of a very blue continuum with well-defined Si
II and Ca II features.  Adopting the NASA/IPAC Extragalactic
Database recession velocity of 6378 km/s for the host galaxy, the
supernova expansion velocity is 16~000 km/s for Si II (rest 635.5
nm) and 27~000 km/s for Ca II (rest 395.1 nm).  These expansion
velocities imply an age of about 2 weeks before maximum (following
Jha et al. 1999, Ap.J. Supp. 125, 73).
     Corrigenda.  Regarding their discovery report on IAUC 7533, W.
Li revises the position of SN 2000fa to be R.A. = 7h15m29s.88,
Decl. = +23o25'42".4 (equinox 2000.0), which is 6".6 east and 4".2
north of the nucleus of UGC 3770.  Magnitudes for SN 2000fa:  Nov.
30.5 UT, 17.3; Dec. 1.2, 17.0.


COMET C/2000 W1 (UTSUNOMIYA-JONES)
     Total visual magnitude and coma-diameter estimates: Nov. 27.50
UT, 7.1, 5' (M. Mattiazzo, Wallaroo, S. Australia, 7x50 binoculars);
28.82, 7.2, 8'.0 (A. Pearce, Nedlands, W. Australia, 20x80
binoculars); 30.53, 6.8, 8'.5 (Pearce); Dec. 1.91, 6.5, 5' (P. M.
Raymundo, Salvador, Brazil, 11x80 binoculars); 2.94, 6.8, 12' (J. G.
de S. Aguiar, Sousas, Brazil, 11x80 binoculars); 3.96, 6.9, 8' (A.
Amorim, Florianopolis, Brazil, 20x50 binoculars).

                      (C) Copyright 2000 CBAT
2000 December 4                (7535)            Daniel W. E. Green

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