Central Bureau for Astronomical Telegrams
IAUC 7328: 1999gh; 1999fz, 1999gb, 1999gd, 1999gf
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Circular No. 7328
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 1999gh IN NGC 2986
S. Nakano, Sumoto, Japan, reports the discovery by Kesao
Takamizawa, Saku-machi, Nagano-ken, of a supernova (mag 14.6) on
two T-Max 400-120 films taken with 5-min exposures on Dec. 3.806 UT
(and 6 min later) with a 0.10-m f/4.0 lens. Takamizawa provides a
position for SN 1999gh of R.A. = 9h44m20s.2, Decl. = -21o16'13"
(equinox 2000.0), which is east-northeast of the center of NGC
2986. Nothing is visible on 14 patrol films (limting mag
14.5-15.6) taken by Takamizawa between 1995 Jan. 1 and 1998 Nov.
26. Nakano also forwards the following precise position end
figures, measured by Y. Kushida (Yatsugatake South Base
Observatory) from an unfiltered CCD frame taken by R. Kushida with
a 0.40-m f/6.3 Schmidt-Cassegrain reflector on Dec. 5.819, when the
supernova was at mag 14.8: 19s.75, 25".0 (which is 52" east and
15".8 north of the galaxy's center). Nothing is visible on
previous CCD images taken by Kushida between 1996 Dec. and 1999
Feb. (limiting mag 18).
A. V. Filippenko, University of California at Berkeley, and P.
Garnavich, Harvard-Smithsonian Center for Astrophysics, report that
a CCD spectrum (range 390-1040 nm) obtained on Dec. 5 UT with the
Keck-II telescope shows that SN 1999gh is of type Ia, near maximum
brightness. The photospheric velocity, measured from the minimum
of the Si II 615-nm absorption, is 11 200 km/s. The ratio of the
580-nm absorption depth to that of the Si II 615-nm feature is
similar to that seen in SN 1992A, which was somewhat less luminous
than normal. Note that the host galaxy has Hubble type E2.
SUPERNOVAE 1999fz, 1999gb, 1999gd, 1999gf
Filippenko and Garnavich also report spectral confirmations of
supernovae, obtained as above. SN 1999fz in UGC 8164 (cf. IAUC
7314) is of type Ia, probably about 1.5-2 months past maximum
brightness. SN 1999gb in NGC 2532 (cf. IAUC 7316) is indeed of
type IIn, as noted on IAUC 7326. SN 1999gd in NGC 2623 (cf. IAUC
7319) is superposed on a tidal tail in the interacting host galaxy;
it is of type Ia, near maximum brightness, and exhibits prominent,
narrow Na D absorption, suggesting the possibility of significant
extinction. SN 1999gf in UGC 5515 (cf. IAUC 7321) is of type Ia,
probably about 2 months past maximum brightness.
(C) Copyright 1999 CBAT
1999 December 5 (7328) Daniel W. E. Green
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