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IAUC 3393: 1979g; 1979c; W50 AND SS 433; NOVALIKE OBJECT IN Vul

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IAUC number

                                                  Circular No. 3393
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

COMET 1979g
     M. P. Candy, Perth Observatory, reports the discovery of a
comet by J. Johnston and M. Buhagiar; the object is diffuse with
central condensation and a tail < 1o.  The following precise positions
are available from Perth:

     1979 UT             R. A. (1950) Decl.        m1
     Aug. 13.46632    12 35 56.88   - 2 23 52.8    13
          15.48299    12 42 30.94   - 3 31 26.4    13

It is probable that this is Periodic Comet Schwassmann-Wachmann 3,
which has not been seen since its discovery apparition in 1930.  According
to predictions by B. G. Marsden (1979, Handb. Br. Astron.
Assoc., 86), If this is indeed Comet 1930 VI, then the time of perihelion
must be moved ahead so that Delta-T = +34d.  Further observations
(especially precise positions) are urgently needed.

     Corrigendum.  The telegram message for this comet erroneously
used the designation "Comet 1979f", which should read "Comet 1979g".

     The following total visual magnitude estimates have been reported:
1979 Aug. 4.49 UT, 8.8 (D. Machholz, Los Gatos, CA, 25-cm
reflector); 5.49, 8.9 (Machholz); 6.47, 9.5 (A. Hale, Alamogordo,
NM, 32-cm reflector); 7.35, 8.6 (C. Morris, Prospect Hill Observatory,
20 x 80 binoculars); 12.44, 10.2 (Hale).

W50 AND SS 433
     S. van den Bergh, Dominion Astrophysical Observatory, telexes
that H-alpha and forbidden S II interference filter plates of the nonthermal
radio source W50 taken with the Palomar 120-cm Schmidt telescope
show faint filamentary nebulosity located ~ 28' east and 25'
west of SS 433 along the outer edge of the extended radio source.

     J. Isles, British Astronomical Association, reports the following
visual magnitude estimates: 1979 July 24.98 UT; 8.6; 26.96, 8.7;
Aug. 1.00, 8.9.

1979 August 17                 (3393)              Daniel W. E. Green

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