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IAUC 5596: 1992p; 1E 1740.7-2942

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                                                  Circular No. 5596
Central Bureau for Astronomical Telegrams
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

     Howard J. Brewington reports the discovery of his fourth comet,
and S. Nakano, Sumoto, Japan, communicates precise confirmatory
positions, as follows:

     1992 UT             R.A. (2000) Decl.        m1    Observer
     Aug. 28.41       7 15         +36.5         10     Brewington
          28.73646    7 14 20.74   +36 52 54.7   13     Sugie
          28.74688    7 14 22.32   +36 52 52.3            "
          28.76059    7 14 24.03   +36 52 54.1   13.5   Kojima
          28.76389    7 14 25.28   +36 52 50.8          Sugie

H. J. Brewington (Cloudcroft, NM).  0.40-m reflector, 55 x.  Object
   very small and diffuse.
A. Sugie (Dynic Astronomical Observatory).  0.25-m f/3.4 Schmidt.
   Comet very faint and diffuse.
T. Kojima (YGCO Chiyoda Station).  0.25-m f/3.4 Wright-Schmidt.
   Weak image detected only following Sugie's identification.

1E 1740.7-2942
     S. Djorgovski, D. Thompson and J. Mazzarella, California
Institute of Technology; and A. Klemola, Lick Observatory, report: "We
attempted infrared imaging of the field of 1E 1740.7-2942, the
proposed counterpart of the Galactic center e+e- gamma-ray source,
also a radio source (cf. IAUC 5395; Mirabel et al. 1992, Nature 358,
215).  Deep images obtained at the Palomar 5-m Hale telescope reveal no
counterpart of the radio source down to K = 17.0 and L' = 13.0.  There
might be a very marginal detection of a source at L' = 13 +/- 1 right
at the radio core position, but at this stage this should be regarded
as an upper limit only.  There are numerous other infrared-bright
sources within the x-ray error circle, reaching up to L' = 8.0, and
these may be heavily obscured supergiants in the nearby molecular
cloud.  Repeat observations in L' by G. Neugebauer, K. Matthews and L.
Armus, California Institute of Technology, did not reveal any strongly
variable infrared sources and were not deep enough to check on the
possible radio-source counterpart."

1992 August 28                 (5596)              Brian G. Marsden

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