Central Bureau for Astronomical Telegrams
IAUC 4946: N LMC 1990; 1989b1; 1989c1; GALACTIC CENTER
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Circular No. 4946
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
NOVA IN THE LARGE MAGELLANIC CLOUD 1990
R. H. McNaught, Siding Spring Observatory, reports that Gordon
Garradd, Tamworth, N.S.W., has discovered a nova in the LMC on Tech
Pan 2415 exposures using a 0.3-m lens. On Jan. 16.47 UT the object was
of mag 11.5. Nothing appears at the position of the nova to mag 15 on
Jan. 3.61 UT. The following position was measured by McNaught from a
10-s exposure by him with the Uppsala Southern Schmidt on Jan. 17.44 UT:
R.A = 5h23m44s.73, Decl. = -69d32'27".2 (equinox 1950.0). The nova lies
94".6 west and 22".1 north of SAO 249266. There is no star on the
Hodge-Wright atlas in the position of the nova. Visual magnitude
estimates: Jan. 17.47 UT, 12.4 (D. A. J. Seargent, The Entrance,
N.S.W.); 17.55, 12.5 (A. Pearce, Scarborough, Western Australia).
PERIODIC COMET TUTTLE-GIACOBINI-KRESAK (1989b1)
Total visual magnitude estimates by Pearce (0.41-m reflector):
Jan. 5.81 UT, 12.7; 7.82, 13.0.
COMET AUSTIN (1989c1)
Total visual magnitude estimates: Jan. 14.08 UT, 9.9 (A. Hale, Las
Cruces, NM, 0.41-m reflector); 16.57, 9.2 (Pearce, 20 x 80 binoculars).
GALACTIC CENTER
F. Yusef-Zadeh, Northwestern University, reports the detection of a
number of new features associated with the compact radio source at the
Galactic center. These small-scale features with scale size less than
900 AU (0".1) and typical flux density of 1 mJy or greater appear to
arise from the VLBI source at the dynamical center and follow
predominantly in the direction toward the minor axis of the Galaxy and
away from the IRS 16 complex. This result gives additional evidence to
the uniqueness of this object in the Galaxy and supports the view that
the compact radio source is a source of outflow influencing the
immediate interstellar environment of the Galactic center. These new
substructures are based on high-resolution (FWHM = 0".1 by 0".2)
observations made with the VLA at 2 cm, where both ordinary CLEAN and
Maximum Entropy algorithms were used to reconstruct images with dynamic
range greater than 15 000.
1990 January 17 (4946) Brian G. Marsden
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