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IAUC 3583: SN IN NGC 1316; SN IN NGC 4536; 1980 S 13 = 1980 S 24 = 1980 S 25; 1980b

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IAUC number

                                                  Circular No. 3583
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

     T. Cragg, Anglo-Australian Observatory, reports that R. Evans
has visually discovered a supernova 20" west and 100" south of the
center of NGC 1316 (R.A. = 3h20m.7, Decl. =  37o25', equinox 1950.0), also
known as the radio source For A; the magnitude was estimated as
12.7 on Mar. 9.479 UT.
     M. Wischnjewsky and J. Maza, Department of Astronomy, University
of Chile, telex that they have confirmed this supernova, and provide
the following photographic magnitude estimates: Mar. 1.076 UT,
20.5; 2.073, 18; 3.060, 15.5; 4.042, 15.

     G. Vettolani, Institute of Radio Astronomy, Bologna, telexes
that a plate taken Mar. 7 at the Loiano Observatory shows this object
at V ~ 12.
     C. -Y. Shao, Center for Astrophysics, also reports a confirmation
of the supernova in NGC 4536 (cf. IAUC 3580), following examination
of a Damon sky-patrol plate taken at the Agassiz Station by
G. Schwartz on Feb. 28.249 UT.

1980 S 13 = 1980 S 24 = 1980 S 25
     R. S. Harrlngton, D. Pascu and P. K. Seidelmann, U.S. Naval
Observatory, write: "Our continuing investigation of the orbit of
the objects associated with the Saturn satellite designations 1980
S 13, 1980 S 24 and 1980 S 25 (cf. IAUC 3534, 3545, 3549) leads us
to suggest that there may be an object or condensation of material
at both the L4 and L5 libration points of Saturn III (Tethys). The
orbit with a period of 1.84 days does not fit the data well and is
unstable.  The 1.99-day-period orbit does not fit the May data, and
we have negative observations in Mar. when the object should have
been observable.  Additional observations of this object, or these
objects, are required to resolve the situation of the orbits and
the question of solid object versus condensation of material."

     J. E. Bortle, Stormville, NY, provides the following total visual
magnitude estimate (0.32-m reflector): Jan. 31.42 UT, 12.7.

1981 March 11                  (3583)              Daniel W. E. Green

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