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IAUC 3951: Poss. SN IN NGC 6907; 2S 1254-690; 1983 SN; P/ENCKE

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IAUC number 

                                                  Circular No. 3951
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 617-495-7244/7440/7444


POSSIBLE SUPERNOVA IN NGC 6907
     J. Maza, Department of Astronomy, University of Chile, telexes
that L. E. Gonzalez has found a possible supernova in NGC 6907,
located 50" west and 20" south of the galaxy's center (R.A. = 20h22m1,
Decl = -24deg58', equinox 1950.0).  On May 29, the object was at mpg 15.0.


2S 1254-690
     C. Motch, Observatoire de Besancon; H. Pedersen, European
Southern Observatory; and S. A. Ilovaisky and C. Chevalier,
Besancon, telex: "Analysis of a large number of 5-min, V-filter CCD
exposures of 2S 1254-690, obtained between Feb. 1 and May 18 with
the 1.54-m Danish and 2.2-m telescopes at La Silla, shows clear
evidence of a persistent, 3.93-hr periodic modulation, most likely
due to orbital motion.  The light curve has approximately a
sinusoidal shape, with variable amplitude of 0.4-0.7 mag, and resembles
that of MXB 1636-53 (Pedersen et al. 1983, Nature 294, 725)."


1983 SN
     The following semiaccurate positions of an object detected by
the Infrared Astronomical Satellite were reported by S. Green,
University of Leicester, on 1983 Oct. 1.  Although the information
was transmitted at that time to some key observers, the delay of
five days and bad weather at critical ground sites prevented
confirmation.  J. Davies has recently advised us that, of the 50 or
so tentative but unconfirmed reports by the IRAS Preliminary Analysis
Facility, this is by far the most likely to have referred to
a discrete object with unusual motion--presumably an Apollo object.

         1983 UT             R.A. (1950.0) Decl.     Mag.

         Sept.26.26624     17 04.34      + 0 15.4     16
              26.33779     17 05.42      + 0 25.6
              26.40933     17 06.66      + 0 35.8
              26.48088     17 07.64      + 0 45.9
              26.55242     17 08.80      + 0 55.9


PERIODIC COMET ENCKE
     Total visual magnitude estimates by D. Seargent, The Entrance,
N.S.W. (15 x 80 binoculars):  Apr. 11.79 UT, 7.4; 14.75, 8.1 (very
light sky, moonlight); 17.79, 8.5 (bright moonlight).


1984 June 11                   (3951)            Daniel W. E. Green

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