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IAUC 3534: Sats OF SATURN; SN IN NGC 6946; Prob. N IN Sgr

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                                                  Circular No. 3534
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

     On behalf of the Space Telescope Wide Field/Planetary Camera
Instrument Definition Team, D. Pascu, R. Harrington and P. K.
Seidelmann, U.S. Naval Observatory, suggest the identifications
1980 S 13 = 1980 S 24 = 1980 S 25.  As a result, they were able to
locate an additional observation in the data taken with the 500 x
500 pixel CCD system on the 1.5-m astrometric reflector in Flagstaff:
Mar. 15.35059, 46".8 west, mR ~ 18.  They also note the identification
1980 S 6 = 1980 S 18.  Their orbital analyses for the
four definite satellites recognized in the 1980 ground-based data
are as follows:

     Satellite            P            a          L
     1980 S 1     0.6944 +/- 0.0001  24"77   306o+/- 1o
     1980 S 3     0.6941 +/- 0.0001  24.76   134 +/- 2
     1980 S 6     2.742  +/- 0.001   61.4      1 +/- 1
     1980 S 13    1.992  +/- 0.002   49.7    289 +/- 7

Here P is the synodic period (in days), a the orbital radius at mean
opposition distance, and L the orbital longitude (from greatest
eastern elongation) at the epoch 1980 Mar. 12.0 ET (at the

     R. Kirshner, University of Michigan, reports that spectrophotometry
by Kriss and Berg at McGraw-Hill Observatory on Oct. 31,
Nov. 1 and Nov. 4 shows that the object has a blue continuum and
weak H-alpha emission.  It appears to be a Type II supernova at apparent
mag ~ 11 near maximum light.

     J. Bryan, Austin, TX, reports that he independently discovered
the supernova on Nov. 5.  He gave mv = 11.0 and the offset from the
galaxy's nucleus as 285" east and 160" south.

     H. Kosai, Tokyo Astronomical Observatory, telexes that spectrograms
obtained by K. Ishida and H. Maehara at the Kiso Station on
Oct. 30.39 UT showed H-alpha and H-beta emission; mv ~ 9.

     Visual magnitude estimates by P. L. Collins, Cambridge, MA:
Nov. 5.95 UT, 9.4; 6.94, 9.2.

1980 November 7                (3534)              Brian G. Marsden

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