Central Bureau for Astronomical Telegrams
IAUC 7268: 1999eb; 1999ec; 1999dj
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Circular No. 7268
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 1999eb IN NGC 664
M. Modjaz and W. D. Li, University of California at Berkeley,
on behalf of the Lick Observatory Supernova Search (LOSS; cf. IAUC
6627, 7126), report the discovery with the 0.8-m Katzman Automatic
Imaging Telescope (KAIT) of a supernova in NGC 664. SN 1999eb was
discovered on an unfiltered image taken on Oct. 2.4 UT (mag about
16.2) and was confirmed on earlier images taken on Sept. 29.4 (mag
about 16.8), 22.4 (mag 18.0), and 19.4 (at the limiting mag of
19.0). The new object is located at R.A. = 1h43m45s.45, Decl. =
+4 13'25".9 (equinox 2000.0), which is 4".8 west and 4".1 north of
the nucleus of NGC 664. A KAIT image of the same field on Sept.
13.4 (limiting mag about 19.0) showed nothing at the position of SN
1999eb. SN 1996bw and SN 1997W also appeared in NGC 664.
P. Garnavich, S. Jha, P. Challis, and R. Kirshner, Harvard-
Smithsonian Center for Astrophysics, report that a spectrum, taken
by P. Berlind on Oct. 3.3 UT with the F. L. Whipple Observatory
1.5-m telescope (+ FAST spectrograph), shows SN 1999eb to be a
type-IIn supernova with narrow and intermediate-width Balmer
emission lines superimposed on a blue continuum. He I 587.5-nm is
also seen, but only as a broad component with a width of 4500 km/s
(FWHM). The Balmer lines show a narrow absorption blueshifted by
900 km/s relative to the peak emission. Permitted Fe II features
with P-Cyg profiles are also present. The spectrum is similar to
SN 1995G (IAUC 6139).
SUPERNOVA 1999ec IN NGC 2207
Modjaz and Li also report the discovery of an apparent
supernova in NGC 2207 by the LOSS on unfiltered KAIT images taken
on Oct. 2.5 and 3.5 (both with SN 1999ec at mag about 17.9). SN
1999ec also appeared on an image taken on Sept. 20.5 (mag about
17.5). The new object is located at R.A. = 6h16m16s.16, Decl. =
-21 22'09".8 (equinox 2000.0), which is 81".7 west and 12".1 north
of the nucleus of NGC 2207. A KAIT image of the same field on 1998
Oct. 14.5 (limiting mag about 19.0) showed nothing at the position
of SN 1999ec. SN 1975A also appeared in NGC 2207, which is a
galaxy interacting with IC 2613.
SUPERNOVA 1999dj IN UGC 1258
Unfiltered CCD magnitude estimate by L. Kiss, K. Sarneczky,
and G. Szabo, Piszkesteto, Konkoly Observatory: Sept. 24.13 UT,
17.4 +/- 0.3.
(C) Copyright 1999 CBAT
1999 October 4 (7268) Daniel W. E. Green
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