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IAUC 5623: 1992u; GRS 1734-292; N Cyg 1992

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                                                  Circular No. 5623
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


PERIODIC COMET VAISALA 1 (1992u)
     J. V. Scotti, Lunar and Planetary Laboratory, reports his
recovery of this comet with the Spacewatch telescope at Kitt Peak.
The object is of stellar appearance and the position is in close
agreement with the prediction on MPC 16379 (ephemeris on MPC 20653).

     1992 UT             R.A. (2000) Decl.        m1
     Sept.26.47353    8 00 37.19   +14 16 31.1
          26.48174    8 00 37.80   +14 16 29.7   21.7
          26.49755    8 00 39.31   +14 16 25.1
          27.47478    8 02 07.37   +14 12 42.6
          27.48235    8 02 07.98   +14 12 41.0   21.6
          27.48815    8 02 08.56   +14 12 37.9


GRS 1734-292
     E. Churazov, M. Gilfanov, B. Cordier, and M. C. Schmitz-
Fraysse, on behalf of the Granat team (Space Research Institute,
Moscow; Service d'Astrophysique du CEA, Saclay; Centre d'Etude
Spatiale des Rayonnements, Toulouse), report:  "The Galactic Center
region has been observed by Granat on Sept. 14, 15, 17, and 18.  An
outburst of hard x-ray emission from GRS 1734-292 (IAUC 5123) has
been detected by the SIGMA telescope on Sept. 15 and 17.  The 40-
to 400-keV flux from the source rose from < 20 mCrab (2-sigma upper
limit, Sept. 14) up to 36 mCrab on Sept. 15 and 17 (5.5-sigma
detection), and then declined to < 20 mCrab on Sept. 18.  The averaged
Sept. 15 and 17 source spectrum was extremely hard, with a 40-
to 400-keV power-law photon index of -0.6 +/- 0.4.  No evidence of
a narrow annihilation line has been detected in the range 450-550
keV, with an upper limit on the narrow-line flux of 2 x 10E-3
photon sE-1 cmE-2 (3 sigma)."


NOVA CYGNI 1992
     D. Hanzl and E. Neureiterova report the following additional
photometry (cf. IAUC 5571, 5598) obtained at the N. Copernicus
Observatory and Planetarium in Brno (comparison star HD 195664): Aug.
30.862 UT, V = 10.06 +/- 0.07, B-V = -0.72 +/- 0.08, U-B = -1.18
+/- 0.10; Sept. 2.856, 9.91 +/- 0.02, -0.64 +/- 0.03, -1.17 +/-
0.05; 17.834, 10.05 +/- 0.06, -0.66 +/- 0.05, -1.26 +/- 0.03;
18.801, 10.04 +/- 0.03, -0.64 +/- 0.02, -1.25 +/- 0.02.


1992 September 28              (5623)            Daniel W. E. Green

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