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IAUC 3355: SN IN NGC 4321; NOVALIKE OBJECT IN Vul; Notice

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IAUC number 

                                                  Circular No. 3355
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM     Telephone 617-864-5758


SUPERNOVA IN NGC 4321
     G. de Vaucouleurs, University of Texas, writes that provisional
reductions of visual observations made by him with the 30-cm
finder of the 205-cm reflector at the McDonald Observatory and of
photoelectric observations by B. Smith and B. Beardsley with the
75-cm reflector yield the following:

     1979 UT        mv      V      B-V     U-B
     Apr. 23.2    12.08   12.05   +0.10   -0.49
          24.2    12.14   12.09   +0.12   -0.45
          25.2    12.03
          26.2    12.4:

The supernova is very blue in U-B and apparently unobscured, corresponding
to Pskovskij's (1977, Soviet Astron. 21, 675) beta class 10
at or near maximum.  The observed value B = 12.2 at maximum is
consistent with the characteristic M_B = -18.5 for type I supernovae at
maximum if the Virgo S cloud modulus is B - A_B - M_B = 30.5 and A_B =
0.2 (Astrophys. J. 1979, 227, 729).  The three previously recorded
supernovae in this galaxy, 1901B, 1914A and 1959E, were of magnitudes
15.6, 15.7 and 17.5 at maximum, respectively.

     G. F. O. Schnur, European Southern Observatory, informs us
that his observations on IAUC 3351 refer to the wrong star and
should therefore be ignored.


NOVALIKE OBJECT IN VULPECULA
     Photoelectric observations by R. E. Zissell, Williston
Observatory: Apr. 21.34 UT, V = 8.85; 25.33, 8.81.


NOTICE TO CONTRIBUTORS
     Several contributors are still telexing information to the
Smithsonian Astrophysical Observatory's Communications Center,
rather than to the TWX number 710-320-6842 ASTROGRAM CAM.  This is
a source of both inconvenience and delay.  Those sending information
by cablegram or regular telegram should also use the TWX number
and answerback in the address.  The words Smithsonian Astrophysical
Observatory should not be used.  The Central Bureau's TWX
machine is officially registered under the address CENTRAL BUREAU
FOR ASTRON, CAMBRIDGE, MASS, and use of this is optional.


1979 May 4                     (3355)              Brian G. Marsden

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