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IAUC 3627: Poss. SN IN ESO 356-G20; 1981g; 1980 S 6 = 1981 S 3 = 1981 S 5

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IAUC number 

                                                  Circular No. 3627
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


POSSIBLE SUPERNOVA IN ESO 356-G20
     J. Maza, Department of Astronomy, University of Chile, telexes
that M. Wischnjewsky has discovered a possible supernova in the Sa
galaxy ESO 356-G20 = MCG -7-6-13 (R.A. = 2h55m.6, Decl. = -35o46', equinox
1950.0).  On a plate taken by Maza on Aug. 10.38 UT the object appears
at mpg = 15.0 and is located 14" east and 7" south of the
galaxy's nucleus.


COMET GONZALEZ (1981g)
     Maza also communicates the following new and revised (cf. IAUC
3617, 3618) measurements, obtained at Cerro El Roble:

     1981 UT             R. A. (1950) Decl.        Observer
     June 29.26389     0 08 28.40   -51 24 25.6    Gonzalez
          29.28472     0 08 29.26   -51 25 15.4      "
          29.28889     0 08 29.50   -51 25 34.0      "
          29.30972     0 08 30.28   -51 26 22.4      "
     July 22.24508     0 17 46.73   -68 54 19.2    Torres
          22.27703     0 17 45.94   -68 55 43.0      "
          22.41453     0 17 44.11   -69 01 40.8      "
          29.25139     0 14 16.52   -73 48 45.7    Gonzalez
          31.19583     0 12 10.04   -75 05 59.3      "
          31.32569     0 11 59.76   -75 11 03.6      "
          31.38611     0 11 54.78   -75 13 26.5      "

The June 29 positions refer to the beginning and end of two trails;
the July 29 plate is of inferior quality.

     The following improved parabolic orbital elements, by the undersigned,
are from the 16 available observations June 29-Aug. 3:

       T = 1981 Mar. 25.654 ET   Peri. = 181.600
                                 Node  = 143.268   1950.0
       q = 2.33340 AU            Incl. = 107.149


1980 S 6 = 1981 S 3 = 1981 S 5
     H. J. Reitsema, Lunar and Planetary Laboratory, informs us of
the above identifications (cf. IAUC 3619) and draws attention to
the fact that the longitude difference between 1980 S 6 ('Dione B')
and Saturn IV (Dione) was then near a minimum (cf. IAUC 3572).


1981 August 13                 (3627)              Brian G. Marsden

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