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IAUC 5235: 1991P; SS LMi; N Cen 1991

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                                                  Circular No. 5235
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

     S. Raychaudhury, Institute of Astronomy, Cambridge; and G.
Williger, Cerro Tololo Interamerican Observatory, report the discovery
of an apparent supernova (R about 20.0) in an anonymous galaxy
(J about 16.5) on CCD images obtained with the CTIO 0.9-m telescope
on Apr. 10.27 UT.  The candidate object is 8".0 east and 8".9 south
of the nucleus of a spiral galaxy centered at R.A. = 13h15m24s.3,
Decl. = -15 02'19".4 (equinox 1950.0).  No star appears in this
position on the first Palomar Sky Survey E and O plates.  Preliminary
inspection of raw CCD images in V and R suggests that the candidate
has decreased in brightness by about 0.3 mag as of Apr. 11.22
and that the candidate is bluer than the spiral arms.

     S. B. Howell, Planetary Science Institute; and T. J. Kreidl,
Lowell Observatory, report:  "Observations of SS LMi with the 1.8-m
Perkins Telescope (+ RCA direct CCD) on 1990 Apr. 20 UT, as part of
our monitoring program of faint novae, gave Johnson magnitudes V =
18.5 +/- 0.1, R about 17.9 +/- 0.1.  Our measures show that SS LMi
has colors typical of dwarf novae or novae; an average value of B-V
for dwarf novae suggests that, during our observations, SS LMi was
about 2.0 mag above the minimum reported by Duerbeck (1987, Space
Sci. Rev. 45, 177).  The agreement with Harrison's I value (cf. IAUC
5233) suggests that this brightened state either has persisted for
at least a year or occurred last April as well.  Duerbeck's maximum
listed magnitude (mpg = 15.9) suggests that this object is likely to
be a high-galactic-latitude dwarf nova with an overall outburst
amplitude of > about 5 mag.  The variation of about 2 mag seen in SS
LMi's minimum magnitude may be similar to others noted by Howell et
al. (1990, P.A.S.P. 102, 758).  The V and R values are unlikely to
be affected by reddening, as the galactic latitude of SS LMi is +60
deg; its position is R.A. = 10h31m17s.2, Decl. = +31 23'39" (equinox
1950.0), in agreement with that listed by Duerbeck."

     W. Liller, Vina del Mar, Chile, reports the following magnitudes
obtained with Tech Pan film (+ UV filter):  Apr. 3.998 UT,
11.3; 4.051, 11.5; 6.107, 11.5; 6.180, 11.8; 10.116, 11.7.

1991 April 11                  (5235)             Daniel W. E. Green

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