Circular No. 7447

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 3 B. Gladman, Observatoire de la Côte d’Azur, reports the measure-

ments below from CCD recovery images of this Uranian satellite (cf. IAUC 7230, 7248) obtained by M. Holman, Gladman and J. J. Kavelaars with the 3.8-m Mayall Telescope at Kitt Peak in May and by Holman, T. Grav, N. Haug and K. B. Klepper with the 2.5-m Nordic Optical Telescope at La Palma in June. In May the satellite was located ∼ 3′.0 east and ∼ 0′.4 north of the prediction on IAUC 7385 (elements on MPC 39024).

2000 UT  α_{2000}  δ_{2000}  R
May 27.44653  21^{h}32^{m}43.^{s}50  −15^{o}09′11′′.0
28.44771  21 32 42.91  −15 09 15.9  23.0
29.44628  21 32 42.11  −15 09 20.9
June 28.14743  21 30 56.41  −15 18 28.0  23.2
28.17575  21 30 56.23  −15 18 28.4  23.3
28.20430  21 30 56.07  −15 18 29.3  23.3

The following improved orbital elements, using also the observations on MPC 38967, have been computed by G. V. Williams, Center for Astrophysics, starting from a new unperturbed solution by the undersigned.

Epoch = 2000 Sept. 13.0 TT

T = 2001 Sept.17.7268 TT  ω = 173.^{o}5689
e = 0.327449  Ω = 320.1468 }2000.0
q = 0.072442 AU  i = 146.3403

a = 0.107712 AU n^{o} = 0.1843682 P = 5.346 years

2000 TT α_{2000} δ_{2000} Δ r_{U} ϵ Δα′′ Δδ′′
June 15 21^{h}32.^{m}04 −15^{o}12.^{′}9 19.430 0.116 123.^{o}8 946− 262+
25 21 31.25 −15 16.9 19.296 0.115 133.5 960− 268+
July 5 21 30.20 −15 22.1 19.183 0.114 143.3 972− 274+
15 21 28.95 −15 28.3 19.093 0.113 153.2 981− 280+
25 21 27.53 −15 35.1 19.029 0.111 163.1 988− 285+
Aug. 4 21 26.00 −15 42.4 18.993 0.110 173.0 993− 290+
14 21 24.42 −15 49.9 18.986 0.109 176.9 995− 295+
24 21 22.86 −15 57.1 19.009 0.108 166.9 996− 298+
Sept. 3 21 21.39 −16 03.9 19.061 0.107 156.9 994− 300+
13 21 20.05 −16 09.9 19.139 0.106 146.9 991− 301+
23 21 18.92 −16 15.0 19.243 0.105 136.8 986− 301+
Oct. 3 21 18.04 −16 18.8 19.369 0.103 126.8 980− 300+
2000 July 3  \begin{matrix}c \\ ◯ \end{matrix} Copyright 2000 CBAT  Brian G. Marsden