Central Bureau for Astronomical Telegrams
IAUC 5472: 1992c; GALACTIC CENTER; N Cen 1991
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Read IAUC 5473
Circular No. 5472
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
PERIODIC COMET HOWELL (1992c)
This comet has been recovered by S. M. Larson and J. V. Scotti
on CCD images obtained with the Steward Observatory's 2.3-m reflector
(on Mar. 5, with D. Means assisting) and the University of Arizona's
Spacewatch telescope (on Mar. 6 and 7), both on Kitt Peak.
The observations with the former telescope were made with a Cousins
R filter, and the positions were reduced using secondary field stars
from a scan with the latter telescope. The first Mar. 6 image was
very slightly diffuse. The positions are in good agreement with the
prediction on MPC 16379 (ephemeris on MPC 19527).
1992 UT R.A. (2000) Decl. m1
Mar. 5.44889 11 14 53.66 +11 22 03.7 20.8
5.45630 11 14 53.31 +11 22 05.5
5.46184 11 14 52.95 +11 22 08.2
5.47157 11 14 52.39 +11 22 11.9
6.43866 11 14 00.29 +11 27 38.2 21.7
6.47059 11 13 58.49 +11 27 48.2 22.2
7.38851 11 13 08.73 +11 32 58.2
7.41396 11 13 07.20 +11 33 04.6
GALACTIC CENTER
M. C. Schmitz-Fraysse, B. Cordier, M. Gilfanov, and E. Churazov,
on behalf of the Granat SIGMA team (Centre d'Etude Spatiale des
Rayonnements, Toulouse; Service d'Astrophysique, CEA, Saclay; Space
Research Institute, Moscow), report: "During the observations of
the Galactic Center performed by the SIGMA telescope on Feb. 18, 22,
and 23, corresponding to a total effective exposure of 181 000 s,
the hard-x-ray, soft-gamma-ray source 1E 1740.7-2942 was detected
in the 40- to 150-keV energy range at the 8-sigma significance level,
with a flux of about 45 mCrab. Its averaged photon spectrum
appears compatible with a power law of index -2.5."
NOVA CENTAURI 1991
Photometry by P. M. Kilmartin with the 0.6-m Boller & Chivens
Cassegrain reflector at Mt. John University Observatory: 1991 Dec.
17.60 UT, V = 14.72 +/- 0.11, B-V = +1.06 +/- 0.04.
1992 March 11 (5472) Daniel W. E. Green
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