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IAUC 5233: 1991O; N Her 1991; SS LMi

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                                                  Circular No. 5233
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

     J. Mueller reports her discovery of a supernova of red magnitude
about 18, located at R.A. = 14h23m33s.9, Decl. = +65 59'06".8
(equinox 1950.0); the galaxy's center is located at R.A. =
14h23m32s.3, Decl. = +65 59'01".6.  The discovery plate was taken by
Mueller on Mar. 18 UT with the 1.2-m Oschin Telescope in the course
of the second Palomar Sky Survey.  A. V. Filippenko, University of
California at Berkeley, reports that a spectrogram (range 390-700
nm, resolution 1.5 nm) of SN 1991O, obtained on Apr. 7 UT with the
Shane 3-m reflector at Lick Observatory, shows it to be a type-Ia
supernova about 1-2 months past maximum brightness.

     M. W. Feast, South African Astronomical Observatory, reports:
"Spectra obtained at SAAO by T. L. Evans on Apr. 4 and 5 show the
broad H-alpha emission (FWHM about 5000 km/s) is split into five
main components with approximate velocities relative to line center
0, +/- 780, and +/- 1900 km/s.  In each of the two pairs, the
redshifted peak is about 0.7 the intensity of the blueshifted peak.
This is consistent with absorption of the receding components by a
dust shell 'McLaughlin effect' (cf. IAUC 5230).  Note similarity to
Nova Cyg 1978 (V1668 Cyg)."
     J. A. Mattei, AAVSO, forwards photoelectric observations by L.
F. Snyder, Crystal City, NV, noting the presence of modulation with
amplitude of 0.096 mag on Mar. 30 and 0.061 mag on Mar. 31 (the
durations of the observations were not long enough to determine
periodicity):  Mar. 30.466 UT, V = 9.54; 30.473, 9.47; 30.489,
9.55; 30.496, 9.51; 31.488, 9.69; 31.491, 9.65; 31.524, 9.71.

     T. E. Harrison, Mt. Stromlo Observatory, reports:  "B, V, R,
and I CCD images, obtained with the Siding Spring 1.02-m telescope
on Apr. 4.5 and 5.5 UT, of the field of SS LMi show an object at the
position marked by Duerbeck (1987, Space Sci. Rev. 45, 177) for this
supposed 1980 nova.  The object is fairly red, at Cousins-Kron
magnitude I about 17.7 (the object to the immediate north has I =
16.4).  Advantage should be taken of this apparent brightening to
determine the nature of this object."

1991 April 8                   (5233)             Daniel W. E. Green

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