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IAUC 6118: 1988ad; GRO J0422+32; 1994l

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                                                  Circular No. 6118
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444     TWX 710-320-6842 ASTROGRAM CAM

     C. Pollas, Observatoire de la Cote d'Azur, reports his
discovery of an apparent supernova (V = 19.5) on two technical pan
plates obtained by J. Heudier and himself with the OCA Schmidt
telescope on 1988 Dec. 28.77 and 31.79 UT.  SN 1988ad is located at
R.A. = 1h22m50s.65, Decl. = -1o38'26".1 (equinox 1950.0), which is
5".7 west and 0".6 north of the center of an S0 galaxy numbered 36
by Dressler in his study of the cluster Abell 194 (1980, Ap.J.
Suppl. 42, 565).  A nearby star (mag about 16.5) is at position end
figures 47s.58, 37'07".6.  SN 1988ad does not appear on the
digitized SRC J survey, although the background brightness of the
galaxy is high in this vicinity.  Nothing is present at the position
of SN 1988ad on films of similar resolution and limiting magnitude
(21-22) obtained in 1994 December.  Pollas notes that the host
galaxy is not a member of Abell 194 since its heliocentric radial
velocity is 20~269 km/s (Lucey and Carter 1988, MNRAS 235, 1177).

GRO J0422+32
     C. Chevalier and S. A. Ilovaisky, Haute-Provence Observatory,
communicate:  "CCD photometry of this x-ray transient's quiescent
optical counterpart has been obtained with the 1.2-m Haute-Provence
telescope during 8 nights between Oct. 30 and Dec. 6, mainly in the
Cousins R band.  The periodogram of these data shows two peaks: one
at 0.106133 day, and the other at twice this value, 0.212265 +/-
0.000072 day (5.0944 +/- 0.0017 hr).  This latter value excludes
that reported by Orosz and Bailyln (IAUC 6103).  This new period
could fit the Haute-Provence data obtained during the active state,
and it differs by only 0.06 percent our previous result (A.Ap., in
press).  The 5.094-hr R-band lightcurve is double-waved (maximum
peak-to-peak amplitude 0.2 mag) and shows variations in shape and
amplitude superposed onto night-to-night variations in mean
brightness.  The average magnitudes for the counterpart are Rc =
21.03 +/- 0.10, V = 21.96 +/- 0.20, Ic = 19.88 +/- 0.15."

     Total visual magnitude estimates:  Nov. 28.25 UT, 7.8 (C. E.
Spratt, Victoria, BC, 0.20-m reflector); 30.93, 8.4 (K. Sarneczky,
Raktanya, Hungary, 20x60 binoculars); Dec. 4.44, 7.9 (J. E. Bortle,
Stormville, NY, 10x50 binoculars); 11.12, 7.9 (S. Foglia,
Lumezzane, Italy, 0.40-m reflector).

1994 December 23               (6118)            Daniel W. E. Green

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