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IAUC 5974: 1994f; 1994J; GRO J0422+32

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IAUC number

                                                  Circular No. 5974
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

     Kesao Takamizawa and David H. Levy report their discoveries of
what appears to be the same comet, as follows:

     1994 UT            R.A. (2000) Decl.        m1      Observer
     Apr. 14.756      21 24.0      + 4 48       12.5     Takamizawa
          15.4        21 23.0      + 5 45       10.5     Levy

K. Takamizawa (Saku-cho, Minami-Saku-gun, Nagano-ken, Japan).  Two
  4-min photographic films, 0.10-m f/4.0 camera.  Comet is diffuse
  with central condensation and coma diameter about 1'.
  Communicated by S. Nakano.
D. H. Levy (Tucson, AZ).  Visual observation with 0.41-m reflector.
  Comet diffuse with slight condensation and a broad, faint,
  fanshaped tail.  Motion toward northwest at about 0.3 deg/day.

     B. Schmidt and R. Kirshner, Harvard-Smithsonian Center for
Astrophysics (CfA), report that a spectrum (320-900 nm) taken by J.
Huchra (CfA) with the Multiple Mirror Telescope (+ Blue Channel) on
Apr. 12 UT shows this object to be of type Ia, about 3 months past
maximum light.  The redshift of the host galaxy, derived from Ca
H+K absorption and H-alpha emission, is cz about 0.06, in fair
agreement with that reported by Filippenko et al. (IAUC 5971).

GRO J0422+32
     C. Chevalier and S. A. Ilovaisky, Observatoire de Haute-
Provence, write:  "CCD photometry of the optical counterpart of
this x-ray transient has been obtained with the 1.2-m OHP telescope
in the quiescent state during two runs: Feb. 1-9 and Mar. 3-10,
mostly in the Ic and Rc bands.  Variance analysis of this new set
shows power at a period of 5.09 hr (consistent with the value
previously derived from our 1993 data; see IAUC 5692) and also at
one-half, one-third, and even one-fourth of this value.  Folding
the data reveals a complex and variable light curve which is far
from being of an ellipsoidal type.  The maximum full amplitude is
0.2 mag, but it varies from night to night.  The mean V magnitude
for both runs was 20.66 and 20.56, respectively, with V-Ic = +1.83
in February."

1994 April 15                  (5974)            Daniel W. E. Green

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