Central Bureau for Astronomical Telegrams
IAUC 5309: 1991ak; SVS 13; 1991T; N Cen 1991; N Oph 1991
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Read IAUC 5310
Circular No. 5309
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1991ak IN NGC 5378
P. Wild, Astronomical Institute, Berne, reports his discovery
of a supernova of mpg about 15.5 on July 15.9 UT, located 28" west
and 19" south of the center of NGC 5378. The supernova's position
is R.A. = 13h54m40s.01, Decl. = +38 02'08".4 (equinox 1950.0). The
object was of the same brightness on the night of July 17-18.
SVS 13
G. C. MacLeod, M. J. Gaylard, and D. P. Smits, Hartebeesthoek
Radio Astronomical Observatory, Johannesburg, communicate: "In
response to the request for follow-up radio observations of the optical
outburst of SVS 13 (cf. IAUC 5298), we have observed the ground
state 18-cm transitions of OH. The central velocity is 7.3 +/- 0.2
km/s and its velocity width is 2.3 +/- 0.3 km/s. The antenna
temperatures are < 100 mK, 85 +/- 13 mK, 162 +/- 17 mK, and < 20 mK at
1612, 1665, 1667, and 1720 MHz, respectively. The ratios of the
antenna are: T(1667)/T(1665) = 2, T(1667)/T(1612) > 1.6, and
T(1667)/T(1720) > 8. These values are consistent with optically
thin, thermal emission in LTE, from OH in the underlying molecular
cloud. We did not detect any OH maser emission from this region in
the velocity range -77 to 95 km/s."
SUPERNOVA 1991T IN NGC 4527
Further photometry by A. C. Gilmore, Mt. John University
Observatory (cf. IAUC 5256): July 2.33 UT, V = 14.03 +/- 0.09, B-V =
+0.88 +/- 0.05; 3.37, 14.00 +/- 0.06, +0.92 +/- 0.02.
NOVA CENTAURI 1991
Additional photometry reported by Gilmore (cf. IAUC 5262):
July 14.43, V = 13.74 +/- 0.04, B-V = +1.74 +/- 0.05.
NOVA OPHIUCHI 1991
Photometry by Gilmore (cf. IAUC 5273): July 3.61, V = 14.12 +/-
0.02, B-V = +0.75 +/- 0.05; 14.55, 14.45 +/- 0.04, +0.60 +/- 0.03.
1991 July 18 (5309) Daniel W. E. Green
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