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IAUC 4625: 1988i; CH Cyg; 1988Q

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IAUC number 

                                                  Circular No. 4625
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


PERIODIC COMET CHURYUMOV-GERASIMENKO (1988i)
     J. Gibson, Jet Propulsion Laboratory, and H. Pedersen, European
Southern Observatory, report their independent recoveries of this
comet using the 1.52-m Palomar and 2.2-m La Silla telescopes,
respectively.  The object is close to the prediction on MPC 11502
(ephemeris on MPC 13059).  Both observers find the comet to be
essentially stellar in appearance, and Gibson estimates magnitude
about 20 with a Gunn r filter.

     1988 UT             R.A. (1950) Decl.        m2    Observer
     July  6.35462   20 09 51.96   -29 17 04.7          Gibson
           6.35988   20 09 51.67   -29 17 06.5            "
           6.36514   20 09 51.39   -29 17 07.1            "
           7.36233   20 08 58.12   -29 21 25.8            "
           7.36635   20 08 57.93   -29 21 26.7            "
           7.37039   20 08 57.69   -29 21 27.8            "
          10.14792   20 06 24.55   -29 33 12.1   18.2   Pedersen


CH CYGNI
     Y. Andrillat, Laboratoire d'Astronomie, Universite de Montpellier,
telexes:  "A spectrogram (range 656-1038 nm, dispersion 26 nm/mm)
obtained on June 22.96 UT with a CCD detector at Haute Provence
Observatory shows numerous and intense TiO and VO absorption bands:
TiO at 671.4, 712.6, 759.0, 830.0, 845.2, and 886.0 nm, and VO at
740.0 and 790 nm.  This last band is characteristic of an M7 star,
which is slightly different from the photoelectric classification
(M6; cf. IAUC 4616).  Our spectrum is similar to that of RU Her,
which is classified an M6.5 III star (Turnshek et al. 1985, An
Atlas of Digital Spectra of Cool Stars).  A spectrogram taken on
1987 Sept. 13.89 shows only the preceding TiO bands typical of an
M5 star.  This spectral transition from M5 to M7 corresponds to the
faintest brightness of the star (cf. IAUC 4605)."


SUPERNOVA 1988Q IN ANONYMOUS GALAXY
     C. Pollas, Observatoire de la Cote d'Azur, reports the following
magnitudes:  July 7.92 UT, U = 18.0; 8.92, B = 18.7.


1988 July 11                   (4625)            Daniel W. E. Green

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