Central Bureau for Astronomical Telegrams
IAUC 5210: 1991j; GALACTIC CENTER
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Read IAUC 5211
Circular No. 5210
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 HARTLEY 1 (1991j)
Ephemeris from the elements on IAUC 5209:
1991 ET R.A. (1950) Decl. Delta r m1
Mar. 5 14 17.31 +13 30.7 1.123 1.923 17.0
15 14 15.30 +12 29.0
25 14 08.89 +11 04.6 0.951 1.875 16.5
Apr. 4 13 58.42 + 9 07.8
14 13 44.89 + 6 32.7 0.857 1.841 16.1
24 13 30.19 + 3 20.8
May 4 13 16.56 - 0 17.6 0.860 1.822 16.1
14 13 05.80 - 4 07.3
24 12 59.08 - 7 55.5 0.957 1.819 16.3
June 3 12 56.69 -11 34.2
13 12 58.42 -15 00.1 1.121 1.832 16.7
23 13 03.89 -18 13.1
July 3 13 12.59 -21 14.0 1.325 1.861 17.2
13 13 24.08 -24 03.9
23 13 38.02 -26 43.6 1.552 1.904 17.6
GALACTIC CENTER
J.-H. Zhao, D. A. Roberts, W. M. Goss, and D. A. Frail, National
Radio Astronomy Observatory; K. Y. Lo, University of Illinois;
and R. D. Ekers, Australia Telescope National Facility report: "We
have discovered a transient radio source in Sgr A West, located
16".79 east and 31".29 south of Sgr A* (offset from Sgr A* by 35".5
at p.a. = 151.8 deg, CCW). Using the most accurate position known
for Sgr A*, the transient source is at R.A. = 17h42m30s.597 +/-
0s.005, Decl. = -28 59'49".68 +/- 0".08 (equinox 1950.0). The radio
source was first detected on 1990 Dec. 28 during an ongoing VLA program
to monitor Sgr A*. It reached its peak flux density of 231 mJy
at 8.4 GHz on 1991 Jan. 20. The source has an average spectral
index, alpha, between 8.4 and 22 GHz of -0.9 (S(nu) = nu**alpha).
This source is not associated with the transient source reported by
Davies et al. (1976, Nature 261, 476). The following list provides
the dates and radio flux densities (in mJy) for 8.4 GHz, 15 GHz, and
22 GHz: 1990 Dec. 11, < 5, < 5, < 7; Dec. 28, 87, 48, 39; 1991 Jan.
20, 231, 143, 99; Feb. 4, -, 55, 37; Feb. 15, -, -, 57; Feb. 19,
184, -, -; Feb. 27, -, 85, 33."
1991 March 16 (5210) Daniel W. E. Green
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