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IAUC 5723: 1993d; 1993H; U Gem

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                                                  Circular No. 5723
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

     Jean Mueller, Palomar Mountain Observatory, reports her discovery
of a comet on a 75-min exposure obtained on Mar. 19 by J. D.
Mendenhall and herself with the 1.2-m Oschin Schmidt telescope in the
course of the second Palomar Sky Survey.  The comet had a very obvious
tail to the northwest.  A confirmatory plate was taken on Mar. 24 by
Mueller and C. Brewer through clouds.   Mueller has measured the
following positions:

     1993 UT             R.A. (2000) Decl.       m1
     Mar. 19.35903   13 01 45.39   +64 20 47.6   17
          19.38507   13 01 44.55   +64 20 49.4
          19.41112   13 01 43.92   +64 20 50.5
          24.35938   12 58 12.31   +64 22 47.3

     M. Hamuy, Cerro Tololo Interamerican Observatory; and J. Maza,
University of Chile, report that M. Wischnjewsky has discovered a
supernova 1" east and 12" north of the nucleus of the spiral galaxy
ESO 445-G66 (R.A. = 13h49m58s, Decl. = -30d27'.9, equinox 1950.0).  The
supernova, of mpg about 16.5, was found on a 20-min unfiltered IIa-O
plate taken by G. Valladares and R. Antezana with the CTIO Curtis
Schmidt telescope on Mar. 18.20 UT.  Confirmation was made by D.
Geisler from CCD R and I images obtained on Mar. 21.275 with the CTIO
0.9-m telescope.  Spectra obtained by M. M. Phillips with the CTIO 4-m
telescope on Mar. 21.22 and by M. Hamuy with the CTIO 1.5-m telescope
on Mar. 23.13 reveal that the supernova is of type Ia.  The second
spectrum is intermediate in appearance between the maximum-light
spectra of the type Ia supernovae 1992A and 1986G.  The minimum of the
Si II (635.5 nm) line yields an expansion velocity of 10 100 km/s with
respect to the galaxy's rest frame.

     Visual magnitude estimates by P. Schmeer, Bischmisheim, Germany:
Mar. 19.88 UT, 9.7; 20.86, 9.3.

     Corrigendum.  On IAUC 5722, for Kibbutz Sheffagim read Kibbutz

1993 March 24                  (5723)              Brian G. Marsden

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