Central Bureau for Astronomical Telegrams
IAUC 7530: 2000ew; 2000ex
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Circular No. 7530
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 2000ew IN NGC 3810
T. Puckett and A. Langoussis, Mountain Town, GA, report the
discovery of an apparent supernova (mag 14.9) on an unfiltered CCD
frame (limiting mag 18.5) taken with the Puckett Observatory 0.30-m
automated supernova patrol telescope on Nov. 28.48 UT. The candidate
is located at R.A. = 11h40m58s.52, Decl. = +11o27'55".9 (equinox
2000.0), which is 1".9 west and 20".7 south of the center of NGC
3810. The new object was also present and confirmed (measured end figures
58s.56, 56".4) on unfiltered CCD frames taken with a 0.6-m reflector by
G. J. Garradd, Biosphere 2 Observatory, on Nov. 29.39. The candidate does
not appear on unfiltered images taken by Puckett during Feb. 8-May 8,
and it does not appear on Palomar Sky Survey images taken on 1989 Apr. 4
and 1991 Apr. 17 (each limiting mag about 21.0). SN 1997dq was located
in this same galaxy (cf. IAUC 6770).
SUPERNOVA 2000ex IN ESO 419-G3
A. B. Aazami and W. D. Li, University of California, Berkeley (UCB),
on behalf of LOTOSS (cf. IAUC 7514), report the discovery with the 0.8-m
Katzman Automatic Imaging Telescope (KAIT) of an apparent supernova on
unfiltered images taken on Nov. 26.4 (mag about 17.6) and 27.3 UT (mag about
17.8). The new object is located at R.A. = 3h42m11s.71, Decl. = -27o51'48".0
(equinox 2000.0), which is 7".6 east and 3".4 north of the nucleus of ESO
419-G3 + MCG -05-09-022. A KAIT image of the same field on Nov. 17.4
also showed the supernova at mag about 17.8, while an image on Oct. 19.4
showed nothing at this position (limiting mag about 19.0). SN 1978C was
located in this same galaxy (cf. IAUC 3254).
T. Matheson, S. Jha, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum of SN 2000ex,
obtained by K. Rines on Nov. 28.28 UT with the F. L. Whipple Observatory
1.5-m telescope (+ FAST spectrograph), shows it to be a type II supernova
approximately one week after maximum light. The spectrum consists of
a blue continuum with superposed P-Cyg lines of hydrogen and Ca II.
Narrow H-alpha emission superposed on the spectrum of the supernova
indicates a recession velocity of 4090 km/s for the host galaxy. The
expansion velocity derived from the minimum of the H-beta line is
about 5000 km/s.
A. V. Filippenko and R. Chornock, UCB, report that inspection of
noisy CCD spectra (range 330-760 nm) obtained on Nov. 29 with the Shane
3-m reflector at Lick Observatory reveals that the object is a normal
type II supernova.
(C) Copyright 2000 CBAT
2000 November 29 (7530) Brian G. Marsden
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