Central Bureau for Astronomical Telegrams
IAUC 5163: 1991B; X-RAY TRANSIENT IN Mus; (2060); 1990c
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Read IAUC 5164
Circular No. 5163
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 1991B IN NGC 5426
S. Perlmutter, C. Pennypacker, S. Carlson, N. Hamilton, H.
Marvin, R. Muller, and C. Smith, University of California, communicate:
"The Berkeley Automated Supernova Search reports the discovery
of a supernova of mv about 16 located 10" west and 20" south of
the core of NGC 5426 (R.A. = 14h00m47s.0, Decl. = -5 49'52", equinox
1950.0) in two separate images obtained Jan. 11 UT. Subsequent to
discovery, the supernova was found to be present on images taken
1990 Dec. 23, Dec. 30, 1991 Jan. 1, and Jan. 5. The most recent
previous image was observed on 1990 May 4 and showed no supernova to
a limit of mag 18 (90-percent confidence level)."
X-RAY TRANSIENT IN MUSCA
R. H. McNaught, University of Adelaide, reports that P.
Camilleri observed the area within the Ginga error box (cf. IAUC
5161) on Jan. 12.6 UT and found nothing new to mag 13-14 in comparison
with Atlas Stellarum. R. M. West, European Southern Observatory,
reports that a deep ESO Schmidt plate (limiting mag 22) taken Jan.
13 UT shows nothing new in this vicinity to mag 16.
(2060) CHIRON
C.-I. Lagerkvist, Uppsala Observatory; A. Fitzsimmons, Queens
University of Belfast; and P. R. Magnussen, Queen Mary and Westfield
College, communicate: "With regard to the possible cometary outburst
of (2060) Chiron reported by Meech on IAUC 5159, we observed
this object on the night of 1990 Dec. 11-12 with the Faint Object
Spectrograph on the 4.2-m William Herschel Telescope at La Palma.
Four 20-min exposures were obtained through cirrus. Preliminary
inspection of the individual spectra (range 350-960 nm, resolution 1.0
nm, S/N about 40 at 388.3 nm) yields no sign of cometary CN (0-0)
emission."
COMET LEVY (1990c)
R. H. McNaught, University of Adelaide, reports that an
exposure on Tech Pan film (200-mm lens) taken Jan. 12.62 UT by P.
Camilleri, Cobram, Victoria, shows a 30' tail in p.a. 260 deg and a
fainter 40' anti-tail in p.a. 150 deg.
1991 January 14 (5163) Daniel W. E. Green
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