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IAUC 5912: 1993ai; GRO J0422+32; N Cas 1993

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                                                  Circular No. 5912
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

SUPERNOVA 1993ai IN UGC 3483
     Jean Mueller reports her discovery of a supernova (blue mag
about 18) located 23".5 west of the nucleus of UGC 3483 (R.A. =
6h29m.3, Decl. = +51o23', equinox 1950.0).  The object was found on
a plate taken on Dec. 10 UT by D. J. Griffith, J. D. Mendenhall,
and Mueller with the 1.2-m Oschin Schmidt Telescope in the course
of the second Palomar Sky Survey.
     A. V. Filippenko and L. C. Ho, University of California at
Berkeley; and W. L. W. Sargent, California Institute of Technology,
report that an uncalibrated spectrum (range 350-750 nm) obtained on
Dec. 21 with the 5-m Hale reflector at Palomar Observatory suggests
that the supernova is of type Ia, roughly 1 month past maximum
brightness.  A redshift of about 0.034 was measured for the parent
galaxy from the Na I D absorption line.

GRO J0422+32
     C. Chevalier and S. A. Ilovaisky, Observatoire de Haute-
Provence, write:  "CCD photometry of this repeating transient (IAUC
5842, 5901) obtained with the 1.2-m Haute-Provence telescope on
Dec. 17.0 UT gives V = 15.38, B-V = +0.37, V-Ic = +0.67.  Observations
on Dec. 18 give essentially the same colors at a level 0.05
mag fainter in V.  Although the source is now at a level comparable
with that reached during its brief August outburst, it is slightly
bluer than when measured on Aug. 16 with the same instrument (V =
15.36, B-V = +0.42, V-Ic = +0.71).  During that brief outburst,
which started on Aug. 10, maximum brightness was reached on Aug. 14
(V = 15.2), and the phase of rapid decline started around Aug. 30,
with the object reaching V = 16.8 on Sept. 6."

     Photoelectric photometry:  Dec. 17.77 UT, V = 5.76 +/- 0.03,
B-V = +0.69 +/- 0.04 (H. Mikuz, Ljubljana, Slovenia; cf. IAUC 5905);
17.86, V = 5.69 (E. Poretti, Merate Observatory; comparison star HR
8985, V = 6.24).
     Further visual magnitude estimates (cf. IAUC 5910): Dec. 18.23
UT, 5.8 (E. Waagen, Cambridge, MA); 18.73, 6.1 (S. Meister, Bulach,
Switzerland); 19.07, 6.7 (P. Collins, Scottsdale, AZ); 19.666, 7.3
(L. Szentasko, Budapest, Hungary); 19.73, 6.9 (G. Comello, Groningen,
The Netherlands); 20.24, 6.4 (R. Royer, Lakewood, CA).

1993 December 21               (5912)            Daniel W. E. Green

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