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IAUC 4554: 1988F; (2060); 1988b

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                                                  Circular No. 4554
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM    Telephone 617-495-7244/7440/7444

     Jean Mueller, Palomar Observatory, reports the discovery of a
supernova in UGC 9288 (MCG +2-37-15A; R.A. = 14h26.6, Decl. = +14 05',
equinox 1950.0) on a Feb. 20 plate taken with the 1.2-m Oschin
Schmidt telescope during the course of the Sky Survey II.  The object
was at mag about 16 and is located 27" west and 23".5 south of the
galaxy's center.  Spectra obtained on Feb. 21 by W. Sargent, C.
Steidel, and L. Zuo with the 5-m Hale reflector show a broad
emission feature centered at 500 nm in a 495-515-nm bandpass, and a
strong, deep absorption at 740 nm and a broad emission at 748 nm
in a 706-772-nm bandpass, suggesting a type-I supernova.
     A. V. Filippenko, University of California at Berkeley,
reports that spectra (range 310-930 nm, resolution 1-2 nm) obtained
with the Shane 3-m reflector (+ CCD spectrograph) at Lick Observatory
on Feb. 24 show that the object is a type-Ia supernova,
probably about one month past maximum.

(2060) CHIRON
     D. J. Tholen, University of Hawaii; W. K. Hartmann, Planetary
Science Institute; and D. P. Cruikshank, Ames Research Center,
report: "We obtained VRIJHK photometry of (2060) Chiron on Feb. 20,
21, and 22 UT with the NASA Infrared Telescope Facility.  The magnitude
on all three nights was V about 17.2, which is 0.7 mag brighter
than the well-determined ephemeris magnitude.  This excess cannot
be attributed to Chiron's lightcurve, which has an amplitude of only
0.09 mag (Bus et al., Icarus, in press).  The J magnitudes were
similarly bright at 16.1.  As-yet-unprocessed CCD images obtained
with the University of Hawaii 2.24-m telescope by S. Lilly on Feb.
21 show no discernible coma, and a low-resolution spectrum (range
about 450-700 nm) shows no detectable emission features.  We note that
the V magnitudes obtained by E. Bowell and A. Hewitt in 1978 were
also abnormally bright by about 0.7 mag.  We urge observers to obtain
additional data to provide an independent confirmation and to
determine the nature of this apparent 'outburst'."

     Corrigendum.  On IAUC 4547, change the description of the comet
on the Shoemaker films to "diffuse with weak condensation and a
very weak tail 0'.5-1'.0 long toward the northwest".

1988 February 24               (4554)            Daniel W. E. Green

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