Central Bureau for Astronomical Telegrams
IAUC 7341: 2000A; 1999gp; 1999gh
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Circular No. 7341
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2000A IN MCG +1-59-81
W. D. Li, University of California at Berkeley, on behalf of
the Lick Observatory Supernova Search (cf. IAUC 6627, 7126),
reports the discovery with the 0.8-m Katzman Automatic Imaging
Telescope (KAIT) of a supernova of mag about 16.5 on unfiltered
images taken on Jan. 1.07 and 1.20 UT, confirmed at about the same
brightness on Jan. 2.10. SN 2000A is located at R.A. =
23h27m58s.90, Decl. = +8 47'02".1 (equinox 2000.0), which is 1".6
east and 4".6 north of the nucleus of MCG +1-59-81, which in turn
is 30" northeast of NGC 7674. A KAIT image of the same field taken
on 1999 Dec. 22.1 shows nothing at the position of SN 2000A
(limiting mag about 19.0).
S. Jha, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum of SN 2000A, taken
by P. Berlind on Jan. 3.08 UT with the F. L. Whipple Observatory
1.5-m telescope (+ FAST spectrograph), reveals it to be a type-Ia
supernova at maximum light. Narrow superimposed H-alpha emission
gives a recession velocity for the host galaxy (MCG +1-59-81) of
8760 km/s, which matches the NASA/IPAC Extragalactic Database
recession velocity for NGC 7674, indicating that the supernova's
host galaxy and NGC 7674 are associated. The supernova
photospheric expansion velocity, measured to the Si II (rest 635.5
nm) absorption trough, is 9500 km/s.
SUPERNOVA 1999gp IN UGC 1993
S. Jha et al. also report that a spectrum of SN 1999gp (cf.
IAUC 7337), obtained by P. Berlind on Jan. 2.21 UT with the F. L.
Whipple Observatory 1.5-m telescope (+ FAST spectrograph), shows it
to be a type-Ia supernova near maximum light. The absence of a
strong Si II 580-nm feature may indicate that the supernova is
overluminous. Narrow superimposed lines of H-alpha yield a
recession velocity of 8300 km/s for the host galaxy. The supernova
expansion velocity, measured to the Si II (rest 635.5 nm)
absorption trough, is 11 500 km/s.
SUPERNOVA 1999gh IN NGC 2986
Unfiltered CCD magnitudes by S. Yoshida and K. Kadota, Ageo,
Saitama, Japan (comparison-star magnitudes from Tycho V data):
1999 Dec. 6.775 UT, 14.7; 9.781, 15.0; 27.765, 15.6.
(C) Copyright 1999 CBAT
2000 January 3 (7341) Daniel W. E. Green
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