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IAUC 3496: Sats OF SATURN; AM Her

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                                                  Circular No. 3496
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


SATELLITES OF SATURN
     The Space Telescope Wide Field/Planetary Camera Instrument
Definition Team reports the following observations of new satellites
of Saturn, made at the U.S. Naval Observatory in Flagstaff
with the 1.5-m astrometric reflector, using a 500 x 500-pixel CCD
system developed by the ST/WFC Team for ground-based use.  This is
a preliminary and incomplete list of measures of the positions of
the images.  The accuracy of the separations east (+) or west (-)
of the center of Saturn (in the plane of the rings) is ~ 0".5.

1980 S 1 (= 1966 S 2?), mR ~ 14.  Mar. 13.17853 UT, -24".0; 13.18492,
   -24".3; 13.22638, -20".5 (on rings); 13.25174, -16".9 (on rings);
   14.21100, +24".5.

1980 S 3, mR ~ 15.  Mar. 9.30567 UT, -24".9; 9.30897, -24".9;
   9.30975, -25".1.

1980 S 6, mR ~ 18.  Mar. 9.39498 UT, +57".9; 9.40216, +57".6; 9.42662,
   +56".9; 10.31414, -47".0; 10.31968, -47".5; 10.32358, -47".7;
   10.34718, -49".8; 13.18171, -56".6; 13.18788, -56".9; 13.26449,
   -60".0.

1980 S 25 (probably distinct from 1980 S 6), mR ~ 18.  Mar.
   13.36949, -44".1; 13.38126, -44".6.

     H. J. Reitsema, Lunar and Planetary Laboratory, informs us
that A. W. Harris and himself consider that 1980 S 9 = 1980 S 1
(= 1966 S 2?).  He adds that observations around Mar. 14 show a
very definite brightness enhancement at 2.20 +/- 0.02 radii on each
side of Saturn due to the transparency of the Encke Division.  It
is possible that 1980 S 7 and 1980 S 23 represent observations of
this phenomenon, rather than discrete Saturnian satellites.


AM HERCULIS
     G. D. Schmidt, Lick Observatory; H. S. Stockman, Steward
Observatory; and B. Margon, University of Callfbrnla at Los Angeles,
write: "We have obtained spectropolarimetric and spectrophotometric
observations of AM Her (cf. IAUC 3490) with the ITS on the 3-m
Shane reflector at the Lick Observatory.  The data, obtained over
several orbital periods during July 18-20, show circularly polarized
Zeeman-shifted photospheric absorption features of hydrogen
in a magnetic field of strength 14-18 MG.  Previous indirect
estimates of the field strength have been in excess of 100 MG."


1980 July 31                   (3496)              Brian G. Marsden

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