Circular No. 7473

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)

        URL http://cfa-www.harvard.edu/iau/cbat.html ISSN 0081-0304

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

S/1999 U 2 This satellite has been recovered as follows on the basis of an unpub-

lished retrograde orbit solution by the undersigned replacing the direct orbit solution on MPC 39024 and IAUC 7385:

2000 UT α_{2000} δ_{2000} R Observer
Aug. 3.17179 21^{h}27^{m}04.^{s}00 −15^{o}44′08′′.7 23.9 Gladman
3.20671 21 27 03.67 −15 44 10.3 24.1  _{”}
3.23403 21 27 03.42 −15 44 11.3 23.9  _{”}
3.27028 21 27 03.07 −15 44 12.8 24.1  _{”}
5.44288 21 26 43.40 −15 45 41.1 23.9 Holman
5.48448 21 26 43.00 −15 45 42.7  _{”}
5.52555 21 26 42.64 −15 45 44.1  _{”}

B. Gladman (European Southern Observatory). 3.6-m reflector + CCD. M. Holman (Mauna Kea). 3.5-m Canada-France-Hawaii reflector + CCD.

Measured by J.-M. Petit, B. Gladman and J. Kavelaars.

The following perturbed orbital elements, by G. V. Williams, are from the above data and the 20 observations from 1999 on MPC 38967:

Epoch = 2000 Sept. 13.0 TT

T = 2000 July 17.8212 TT  ω = 29.^{o}8432
e = 0.145863  Ω = 189.4991 }2000.0
q = 0.045348 AU  i = 141.5385

a = 0.053092 AU n^{o} = 0.5327706 P = 1.850 years

2000 TT α_{2000} δ_{2000} Δ r_{U} ϵ Δα′′ Δδ′′
Aug. 4 21^{h}26.^{m}95 −15^{o}44.^{′}7 18.897 0.045 172.^{o}8 170− 156+
14 21 25.42 −15 51.5 18.894 0.046 177.1 129− 199+
24 21 23.92 −15 58.1 18.920 0.046 167.2  85− 239+
Sept. 3 21 22.49 −16 04.3 18.975 0.046 157.2  40− 276+
13 21 21.21 −16 09.8 19.059 0.047 147.1  6+ 308+
23 21 20.12 −16 14.4 19.167 0.047 137.1  52+ 335+
Oct. 3 21 19.28 −16 17.9 19.298 0.048 127.1  97+ 358+
13 21 18.73 −16 20.0 19.447 0.048 117.1 141+ 376+
23 21 18.49 −16 20.8 19.610 0.049 107.1 183+ 390+
Nov. 2 21 18.58 −16 20.1 19.783 0.050 97.1 223+ 399+
12 21 19.00 −16 17.9 19.958 0.050 87.2 260+ 403+
22 21 19.75 −16 14.3 20.133 0.051 77.3 293+ 404+
Dec. 2 21 20.82 −16 09.3 20.302 0.052 67.5 323+ 402+
2000 August 5  \begin{matrix}c \\ ◯ \end{matrix} Copyright 2000 CBAT  Brian G. Marsden