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IAUC 5689: 1993a; 1H 0857-242

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                                                  Circular No. 5689
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@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


COMET MUELLER (1993a)
     Preliminary parabolic orbital elements from 18 observations,
Jan. 2-6 (including means of the trail positions on IAUC 5687):

     T = 1994 Jan.  2.303 TT          Peri. = 135.334
                                      Node  = 144.413   2000.0
     q = 1.72810 AU                   Incl. = 124.668

1993 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Jan.  3     9 46.09   +47 11.9   3.731   4.512  138.2    8.4   14.4
      8     9 39.84   +48 32.2   3.656   4.467  141.4    7.9   14.3
     13     9 32.59   +49 52.0   3.589   4.422  143.9    7.5   14.2
     18     9 24.33   +51 09.8   3.532   4.377  145.3    7.4   14.2
     23     9 15.05   +52 23.9   3.484   4.331  145.5    7.4   14.1
     28     9 04.83   +53 32.9   3.447   4.286  144.4    7.7   14.0
Feb.  2     8 53.79   +54 35.3   3.418   4.241  142.2    8.2   13.9
      7     8 42.08   +55 29.9   3.400   4.195  139.1    8.9   13.9
     12     8 29.92   +56 15.8   3.390   4.149  135.2    9.6   13.8


1H 0857-242
     H. Barwig and W. Wimmer, Universitats-Sternwarte, Munchen; and
I. Bues, Remeis-Sternwarte, Bamberg, write:  "Extensive high-speed
photometry of the newly-detected cataclysmic variable 1H 0857-242
(IAUC 5481) has been performed with the European Southern Observatory
1-m telescope at La Silla and the MCCP fiberoptic multichannel
photometer of the University of Munich.  The star was in quiescence
(V = 15.0 +/- 0.5) during 1992 Dec. 26-1993 Jan. 1.  It showed
intense flickering activity at an amplitude in B of 40-60 percent of
the mean brightness.  On Jan. 2 UT, the object was found in
outburst, having brightened 2.7 mag in B and 2.8 mag in V.  Four CCD
spectrograms obtained with the 1.52-m ESO telescope (+ Boller &
Chivens spectrograph; range 360-700 nm, resolution 0.2 nm) show
changes in flux and line structure.  On Jan. 1.34, all the Balmer
and He I lines appear in emission at intermediate strengths.  The
outburst spectrum of Jan. 2.34 reveals the Balmer lines with n >/=
5 as well as He I (447.2 nm) in pure absorption, whereas H-beta has
an emission core and H-alpha a P-Cyg profile.  The two spectra of
Jan. 3.25 and 3.35 demonstrate a steep decrease in intensity in the
blue and a change from the absorption profiles via P-Cyg profiles
to emission features stronger than those of Jan. 1.34."


1993 January 7                 (5689)            Daniel W. E. Green

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