Circular No. 7385

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) BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)

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Phone 617-495-7244/7440/7444 (for emergency use only)

S/1999 U 1, S/1999 U 2 AND S/1999 U 3 The complete set of observations of these three new presumed satel-

lites of Uranus (cf. IAUC 7230, 7248) is given on MPC 38967. Although the orbits are not yet uniquely determined, results from fully converged solutions (a = 0.17 AU, e = 0.06, i = 158^{o} for S/1999 U 1; a = 0.05 AU, e = 0.60, i = 69^{o} for S/1999 U 2; a = 0.14 AU, e = 0.45, i = 151^{o} for S/1999 U 3) are given on MPC 39024. These orbital elements lead to the following current search ephemerides:

2000 TT α_{2000} δ_{2000} Δ r_{U} ϵ Δα′′ Δδ′′
Mar. 27 21^{h}30.^{m}25 −15^{o}30.^{′}1 20.585 0.170 46.^{o}7 1653+ 429+
Apr. 6 21 31.88 −15 22.7 20.457 0.170 56.2 1666+ 426+
16 21 33.26 −15 16.6 20.315 0.170 65.6 1679+ 422+
26 21 34.35 −15 11.8 20.160 0.170 75.1 1693+ 418+
May 6 21 35.15 −15 08.5 19.998 0.170 84.6 1707+ 413+
16 21 35.63 −15 06.8 19.834 0.170 94.2 1721+ 407+
26 21 35.79 −15 06.6 19.672 0.170 103.7 1735+ 401+
June 5 21 35.62 −15 08.0 19.516 0.169 113.4 1749+ 393+
15 21 35.15 −15 10.9 19.372 0.169 123.1 1761+ 384+
Mar. 27 21 28.43 −15 29.2 20.598 0.049 47.1  67+ 484+
Apr. 6 21 30.07 −15 21.3 20.464 0.052 56.6  97+ 513+
16 21 31.47 −15 14.7 20.315 0.054 66.0 127+ 538+
26 21 32.58 −15 09.5 20.154 0.057 75.5 157+ 560+
May 6 21 33.40 −15 05.8 19.986 0.060 85.0 186+ 579+
16 21 33.89 −15 03.7 19.816 0.062 94.5 215+ 594+
26 21 34.07 −15 03.2 19.649 0.064 104.1 244+ 606+
June 5 21 33.92 −15 04.3 19.488 0.066 113.7 272+ 615+
15 21 33.47 −15 06.9 19.339 0.068 123.4 298+ 620+
Mar. 27 21 27.34 −15 33.7 20.756 0.183 47.4 878− 212+
Apr. 6 21 28.91 −15 26.3 20.624 0.184 56.9 916− 212+
16 21 30.22 −15 20.1 20.476 0.184 66.3 954− 214+
26 21 31.26 −15 15.2 20.318 0.185 75.8 991− 216+
May 6 21 32.00 −15 11.7 20.152 0.186 85.4 1026− 219+
16 21 32.43 −15 09.8 19.984 0.187 94.9 1060− 224+
26 21 32.53 −15 09.4 19.819 0.187 104.5 1091− 229+
June 5 21 32.32 −15 10.6 19.660 0.188 114.1 1121− 236+
15 21 31.80 −15 13.2 19.513 0.189 123.8 1147− 243+
2000 March 24  \begin{matrix}c \\ ◯ \end{matrix} Copyright 2000 CBAT  Brian G. Marsden