Central Bureau for Astronomical Telegrams
IAUC 3602: Sats OF SATURN
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Read IAUC 3603
Circular No. 3602
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
Further to IAUC 3593, B. A. Smith, Lunar and Planetary Laboratory,
reports that further analysis suggests that both 1981 S 1 and
1981 S 2 are associated with the triangular libration points of
Saturn III (Tethys), the former with L4, the latter with L5. He
finds that 1980 S 13 = 1980 S 24 (probably) = 1980 S 29 = 1980 S 30
= an observation made from Voyager 1 on 1980 Nov. 7 = 1981 S 1 and
that 1980 S 25 = 1981 S 2. The L4 object appears to have a libration
amplitude of < 2o about the 60o point, and Smith provides the
following additional observations (differential coordinates with respect
to the center of Saturn) by S. M. Larson and J. W. Fountain
with the 1.5-m reflector: 1981 May 2.1835 UT, dR.A. = -46", dDecl.
= -3"; May 3.1842 UT dR.A. = +45", dDecl. = +3".
The suggestion, from the 1980 ground-based observations alone,
that objects were connected with both the L4 and L5 libration points
of Tethys was first made by Seidelmann et al. (Icarus, in press).
E. Bowell, Lowell Observatory, provides the following precise
positions of Saturn VIII (Iapetus) and Saturn IX (Phoebe), measured
from plates taken with the 0.33-m photographic telescope:
Satellite 1981 UT R. A. (1950) Decl. Mag.
VIII Apr. 1.21181 12 24 10.03 + 0 14 33.2
1.25069 12 24 09.39 + 0 14 38.1
5.21597 12 23 04.73 + 0 22 14.8
5.25486 12 23 04.09 + 0 22 19.8
7.20486 12 22 33.96 + 0 25 53.5
7.22847 12 22 33.62 + 0 25 56.6
9.22292 12 22 03.92 + 0 29 28.9
9.25764 12 22 03.39 + 0 29 32.8
IX Mar. 30.27153 12 24 19.20 + 0 14 00.3 17.0
30.31736 12 24 18.51 + 0 14 05.3
Apr. 1.21181 12 23 48.31 + 0 17 18.8
1.25069 12 23 47.60 + 0 17 22.9
5.21597 12 22 44.91 + 0 24 02.1
5.25486 12 22 44.35 + 0 24 05.2
7.20486 12 22 13.84 + 0 27 17.9
7.22847 12 22 13.42 + 0 27 20.8
9.22292 12 21 42.74 + 0 30 33.2
9.25764 12 21 42.20 + 0 30 34.7
1981 May 12 (3602) Brian G. Marsden
Read IAUC 3603
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