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IAUC 4800: 1989n; V404 Cyg; 1988h

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                                                 Circular No. 4800
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 GEHRELS 2 (1989n)
     J. Gibson reports his recovery of this comet with the 1.5-m
reflector (+ CCD + Gunn r filter) at Palomar, the following
positions being very close to the prediction on MPC 12124.
The June 14 images are diffuse with eccentric condensation; the
June 15 images show a tail about 40" long in p.a. 255 deg.

     1989 UT             R.A. (1950) Decl.        m1
     June 14.46010    0 56 51.06   +10 18 51.8    19
          14.46424    0 56 51.43   +10 18 54.0
          14.46841    0 56 51.80   +10 18 56.2
          15.45765    0 58 20.73   +10 27 35.5
          15.46222    0 58 21.15   +10 27 38.1
          15.46669    0 58 21.55   +10 27 40.3


V404 CYGNI
     R. Sunyaev and the Kvant Team (Space Research Institute,
U.S.S.R. Academy of Sciences; Birmingham University; Netherlands
Space Research Organization, Utrecht; Max-Planck-Institut fur
Extraterrestrische Physik; and Astronomisches Institut, University
of Tubingen) telex:  "V404 Cyg = GS 2023+338 was observed several
times during June 9-10 by the instruments of the Kvant module of
the Mir space station.  The source was localized at R.A. =
20h22m06s, Decl. = +33 42.2 (equinox 1950.0) with approximately
0'.4 error using the positions of Cygnus X-1 and Cygnus X-3 in
the field-of-view of the Coded Mask Imaging Spectrometer (TTM).
The star V404 Cyg is inside this error box.  The source is
significantly detected up to 300 keV by the HEXE and Pulsar X-1
instruments.  It has a flat spectrum with a strong absorption and
high energy exponential cut-off at energies > 100 keV.  The
source is strongly variable.  Maximal detected fluxes are 0.1 Crab
at 5 keV, 1.5 Crab at 20 keV, and 3.5 Crab at 100 keV."


COMET SHOEMAKER-HOLT-RODRIQUEZ (1988h)
     Total visual magnitude estimates (cf. IAUC 4675):  May 5.67
UT, 11.7 (D. A. J. Seargent, The Entrance, N.S.W., 0.15-m reflector);
12.89, 11.3 (A. Pearce, Perth, W. Australia, 0.20-m reflector);
June 4.91, 11.3 (Pearce); 24.50, 11.7 (Pearce).


1989 July 3                    (4800)             Daniel W. E. Green

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