Circular No. 7521
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)
S/2000 S 5 AND S/2000 S 6
A team led by B. Gladman (cf. IAUC 7512) reports the discovery of two
more satellites of Saturn (selected CCD astrometry below). Separate
computations by the undersigned and by W. J. Gray (Bowdoinham, ME) indicate
i = 49 deg, e = 0.14, a = 0.074 AU and 47 deg, 0.38, 0.085 AU, respectively,
for the pair. S/2000 S 2 (cf. MPC 41527) has i = 48 deg, e = 0.46, a = 0.098
AU), whereas S/2000 S 1 and Saturn IX (Phoebe) have retrograde orbits (i =
173 deg. The orbits of S/2000 S 3 and S 4 are very indeterminate, and further
observations are urgently needed (cf. IAUC 7513).
2000 UT R.A. (2000) Decl. R Observer
Aug. 7.39963 3 52 08.02 +18 20 03.0 22.6 Gladman
Sept.24.44657 3 57 48.21 +18 27 23.0 Kavelaars
Nov. 2.27282 3 50 26.67 +17 50 21.9 Hergenrother
3.29969 3 50 08.33 +17 49 01.7 "
4.22350 3 49 51.61 +17 47 50.0 UT1 Team
Sept.23.44526 3 57 45.16 +17 42 52.4 22.8 Kavelaars
24.46410 3 57 41.36 +17 42 34.8 22.6 "
Nov. 2.29914 3 50 17.20 +17 21 08.1 Hergenrother
3.30891 3 49 59.47 +17 20 24.2 "
4.23929 3 49 42.93 +17 19 44.5 22.9 UT1 Team
B. Gladman (European Southern Obs.). 2.2-m refl. Measurer J.-M. Petit.
J. Kavelaars and B. Gladman (Mauna Kea). 3.6-m Canada-France-Hawaii
Telescope. Measurer Gladman.
C. W. Hergenrother, R. J. Whiteley and D. Means (Steward Observatory, Kitt
Peak). 2.3-m reflector. Measurer Hergenrother.
UT1 Science Team (Paranal). ESO VLT-UT1 8-m refl. Measurer Gladman.
2000 TT R. A. (2000) Decl. Delta r_S Elong. dR.A. dDecl.
Nov. 12 3 47.42 +17 37.4 8.120 0.072 171.0 1638+ 546+
22 3 44.11 +17 23.6 8.104 0.073 176.8 1659+ 341+
Dec. 2 3 40.80 +17 10.1 8.121 0.075 166.6 1634+ 127+
12 3 37.68 +16 57.6 8.169 0.076 155.8 1569+ 91-
22 3 34.91 +16 46.9 8.246 0.078 145.0 1469+ 304-
Nov. 12 3 47.33 +17 14.0 8.180 0.080 171.0 1562+ 855-
22 3 44.09 +17 06.9 8.164 0.076 176.5 1642+ 663-
Dec. 2 3 40.85 +17 00.4 8.179 0.072 166.6 1678+ 456-
12 3 37.78 +16 55.1 8.224 0.068 155.8 1660+ 240-
22 3 35.05 +16 51.6 8.297 0.064 145.0 1585+ 23-
(C) Copyright 2000 CBAT
2000 November 18 (7521) Brian G. Marsden