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IAUC 5494: 1992Q, 1992R, 1992S; OY Car

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                                                  Circular No. 5494
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams, MS 18
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

SUPERNOVAE 1992Q, 1992R, 1992S
     J. Mueller, Palomar Observatory, reports her discovery of three
probable supernovae on plates taken with the 1.2-m Oschin telescope by
C. Brewer, J. D. Mendenhall and herself in the course of the Second
Palomar Sky Survey.  SN 1992Q, at R.A. = 12 08 27.77, Decl. =
-1 36 09.5 (equinox 1950.0, reduction by D. Levy), is 4".7 west and
10".7 south of the center of an anonymous galaxy; on the Apr. 7
discovery plate the object was of blue mag about 18.5; observations in
nonphotometric conditions by J. Mould and J. Jensen with the Palomar
1.5-m reflector confirm this to be a blue object, and examination by
N. Reid of a similar PSS II plate taken some years ago does not show
any object at the position.  SN 1992R is clearly visible on a spiral
arm of the galaxy MCG +10-24-007 (R.A. = 16 36.2, Decl. = +58 16,
equinox 1950.0), 12".7 east and 4" south of the nucleus; on the Apr.
8 discovery plate it was of blue mag about 18.  SN 1992S, at R.A. =
14 15 31.36, Decl. = +31 16 49.0 (equinox 1950.0), is 14".8 east of the
nucleus of an anonymous galaxy on what appears to be a spiral arm;
this object, of blue mag about 18.5, was found on an Apr. 9 exposure
and confirmed on Apr. 11.

     K. Horne, Space Telescope Science Institute, communicates: "Dwarf
nova OY Car (R.A. = 10 06 22.5, Decl. = -70 14 04.9, equinox 2000.0)
entered a superoutburst (V = 11.5) on Apr. 7.  The Hubble Space
Telescope will observe 13 eclipses of OY Car in six weeks starting on
Apr. 12.  The HST observations are time-resolved ultraviolet
spectroscopy (range 115-240 nm) with the Faint Object Spectrograph
with 6-s time resolution covering eclipse phases.  The first HST
eclipses are scheduled as follows: Apr. 12d10h56m-12d11h33m UT,
13d11h02m-13d11h47m, 13d14h15m-13d14h49m, 15d16h02m-15d16h42m,
16d17h44m-16d18h29m and 20d06h54m-20d07h24m.  We request ground-based
observations in Apr.-May, including spectra, spectrophotometry, high-
speed photometry, or, ideally, time-resolved spectrophotometry
covering the 1.5-hr binary orbit, to extend the wavelength and binary
orbit coverage and to place HST eclipses in the context of the
outburst cycle.  There is a finding chart by Vogt and Bateson (1982,
A.Ap.Suppl. 48, 383).  Please notify Tom Marsh (SPAN 19464::TRM) if
you plan to make or if you succeed in making observations."

1992 April 11                  (5494)              Brian G. Marsden

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