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IAUC 4982: 1990G; MWC 560; SW UMa

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                                                  Circular No. 4982
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


SUPERNOVA 1990G IN IC 2735
     Jean Mueller reports her discovery of a supernova in IC 2735
(UGC 6364; R.A. = 11h18m22s.2, Decl. = +34 37'04", equinox 1950.0);
the object, at mpg about 15 and located 34".6 west and 13".3 north
of the galaxy's center, was found on a plate taken Mar. 19 UT in
the course of the second Palomar Sky Survey with the 1.2-m Oschin
Schmidt Telescope.  R. Kirshner and B. Leibundgut, Center for
Astrophysics, report the independent discovery of this object by
Ann I. Zabludoff, CfA, using the TV guider of the 1.5-m Tillinghast
reflector at Mount Hopkins on Mar. 20; the supernova's position is
R.A. = 11h18m19s.4, Decl. = +34 37'18" (equinox 1950.0; 34" west,
14" north of the galaxy's nucleus).  R. Schild, CfA, estimated mag
R about 16.3 on the same night with the 0.61-m telescope (+ CCD);
C. Smith, CfA, obtained a spectrum with the Multiple Mirror
Telescope, indicating a type-Ia supernova about 1-2 weeks past
maximum and showing a deep absorption at 635 nm.  The CfA redshift
survey gives a radial velocity of about 10 400 km/s for IC 2735.


MWC 560
     A. Dapergolas, E. Kontizas, and M. Kontizas, National Observatory
of Greece at Kryonerio; and A. G. Michalitsianos and S. P.
Maran, Laboratory for Astronomy and Solar Physics, Goddard Space
Flight Center, write:  "We report the following new photometric
observations of MWC 560:  Mar. 12.75 UT, V = 9.45, B = 9.77, U =
9.71; Mar. 14.75, 9.85, 10.20, 9.81; Mar. 16.75, 9.66, 10.01, 9.61.
This object is continuing to increase slowly in U.  Short-term
variations in U are indicated on a timescale of approximately 15 to
20 min, as also reported by Buckley et al. (IAUC 4980), with
approximately 0.1- to 0.2-mag fluctuations."
     Visual magnitude estimates by P. Schmeer, Bischmisheim, W.
Germany: Mar. 14.91 UT, 9.6; 15.93, 9.5; 16.90, 9.6; 17.89, 9.1;
18.85, 9.1.


SW URSAE MAJORIS
     Visual magnitude estimates (cf. IAUC 4979):  Mar. 13.46 UT,
11.6 (H. Narumi, Ehime, Japan); 14.92, 9.9 (H. Feijth, Goutum, The
Netherlands); 15.82, 9.4 (S. Korth, Dusseldorf, West Germany); 17.28,
9.3 (P. Sventek, Houston, TX); 18.80, 10.5 (B. H. Granslo, Blindern,
Oslo, Norway); 19.30, 10.4 (J. McKenna, Upper Montclair, NJ).


1990 March 20                  (4982)             Daniel W. E. Green

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