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IAUC 3944: SN IN ESO 131147-4224.7; APPULSES TO (2060); 1983v

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                                                  Circular No. 3944
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 617-495-7244/7440/7444

SUPERNOVA IN ESO 131147-4224.7
     B. Binggeli, B. Leibundgut, and G. A. Tammann telex their
discovery with the Swope telescope at Las Campanas Observatory of a
supernova in the Sc galaxy ESO 131147-4224.7.  The supernova is located
32" west and 29" north of the galaxy's center (R.A. = 13h11m47s,
Decl. = -42deg24.7, equinox 1950.0).  The following magnitudes are
provided: Apr. 26.1 UT, [18; May 10.1, ~ 16.8; 22.1, 15.5.

     A. R. Klemola, Lick Observatory; and R. L. Millis and L. H.
Wasserman, Lowell Observatory, write that they have surveyed a Lick
0.51-m astrograph plate, searching for appulses during 1984 Oct. 27
to 1985 Jan. 5.  They find that the center of Chiron will pass
within 2" of four faint stars in 1984 Nov.  Times of closest
approach, minimum separations from Chiron, estimated blue magnitudes,
and star positions (epoch 1973.00) are listed.  The orbit
of Chiron on MPC 8667 was used for these predictions.

   1984 ET           Sep.    Mag.      R.A.   (1950.0)   Decl.
   Nov.  8.38614     0"3     16.5     4 21 39.36     +17 02 57.8
         8.90383     1.7     14.5     4 21 32.84     +17 02 38.9
        21.58347     0.3     17.0     4 18 45.49     +16 53 34.3
        25.61330     1.9     17.5     4 17 50.12     +16 50 43.8

The first event occurs with full moon only 25 deg away from the star.
Maximum possible duration of occultation is near 12 s, assuming 250
km for Chiron's diameter.  The large uncertainty (up to 1") in the
position of Chiron does not allow reliable prediction of the
circumstances of these appulses.  The nominal ground tracks for the
first and third events fall in the area from South America to
Australia. Astrometric observations preceding the events are planned.

     Total visual magnitude estimates: Apr. 27.22 UT, 10.7 (C. E.
Spratt, Victoria, BC, 0.20-m reflector); May 2.06, 10.7 (J. Bortle,
Stormville, NY, 0.32-m reflector); 7.46, 11.0 (C. Morris, Angeles
Crest Highway, CA, 0.25-m reflector); 19.25, 11.4 (Morris, Whitaker
Peak, CA).

1984 May 23                    (3944)            Daniel W. E. Green

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