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IAUC 3303: Prob. SN IN NGC 3780; N Cyg 1978; 1978f

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                                                  Circular No. 3303
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 617-864-5758

     P. Wild, Astronomical Institute, Berne University, telexes
that he has discovered a probable supernova 14" east and 13" south
of the nucleus of NGC 3780 (R.A. = 11h36m.6, Decl. = +56o32', equinox
1950.0).  The object, whose existence has been confirmed, was of
photovisual magnitude 16.5 on Nov. 7.  The object does not appear
on the Palomar Sky Survey and several other Berne exposures, although
there may be a faint trace of it on two Berne exposures obtained
in 1976 February, suggesting that it could be some unusual
variable, rather than a supernova.

     J. Mattei, American Association of Variable Star Observers,
communicates the following photoelectric V magnitudes, obtained by
H. Louth, Sedro Woolley, WA, with a 27-cm Maksutov telescope: Sept.
12.16  UT, 6.17; 13.13, 6.33; 14.16, 6.22; 18.17, 7.23; 19.14, 7.67;
19.22, 7.74; 25.31, 8.17; Oct. 2.13, 8.80; 3.12, 8.79; 4.14, 8.87;
5.22, 9.00; 13.11, 9.67; 14.15, 9.78; 15.11, 9.70.

     Further visual magnitude estimates: Oct. 25.13 UT, 10.0 (C.
Sherrod, North Little Rock, AR); 27.17, 10.2 (J. Morgan, Prescott,
AZ); 29.45, 10.3 (Morgan); Nov. 1.10, 10.4 (J. De Young, Huntington,
WV); 2.17, 10.3 (W. Hawley, Concord, NH); 3.28, 10.2 (Hawley).

     The following precise position was obtained by M. P. Candy
with the 33-cm astrograph at the Perth Observatory.  The images
were poor, but the comet was somewhat condensed.

     1978 UT             R. A. (1950) Decl.        m1
     Nov.  5.84479    13 41 14.75   -27 32 47.2    6

     J. Churms, South African Astronomical Observatory, communicates
the following total visual magnitude estimate by J. C.
Bennett (Pretoria, 12-cm refractor): Nov. 9.09 UT, 6.0; almost
stellar, probably only central condensation seen in the dawn.

1978 November 9                (3303)              Brian G. Marsden

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