Circular No. 7450

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 1 This Uranian satellite has been recovered by M. Holman, T. Grav, N.

Haug and K. B. Klepper with the 2.5-m Nordic Optical Telescope at La Palma 1′.5 east and 0′.5 north of the prediction on IAUC 7385 (elements on MPC 39024). The following measurements are by B. Gladman:

2000 UT  α_{2000}  δ_{2000}  R
June 28.15684  21^{h}34^{m}12.^{s}06  −15^{o}16′16′′.6  23.2
28.18513  21 34 11.88  −15 16 17.6  23.5
28.21395  21 34 11.71  −15 16 18.5  23.4
29.16155  21 34 06.12  −15 16 48.8
29.21126  21 34 05.80  −15 16 50.2  23.3

These improved elements, derived by G. V. Williams from a new unperturbed solution by B. G. Marsden, are still somewhat uncertain:

Epoch = 2000 Sept. 13.0 TT

T = 2003 Mar. 31.3912 TT  ω = 2.^{o}1890
e = 0.494329  Ω = 249.8452 }2000.0
q = 0.061537 AU  i = 148.8285

a = 0.121694 AU n^{o} = 0.1535250 P = 6.420 years

2000 TT α_{2000} δ_{2000} Δ r_{U} ϵ Δα′′ Δδ′′
June 15 21^{h}35.^{m}26 −15^{o}10.^{′}4 19.332 0.180 123.^{o}0 1850+ 414+
25 21 34.50 −15 14.6 19.203 0.179 132.8 1864+ 405+
July 5 21 33.48 −15 20.1 19.093 0.179 142.6 1875+ 394+
15 21 32.25 −15 26.6 19.007 0.179 152.4 1884+ 383+
25 21 30.85 −15 33.7 18.946 0.178 162.3 1889+ 370+
Aug. 4 21 29.33 −15 41.3 18.913 0.178 172.2 1892+ 357+
14 21 27.75 −15 49.1 18.910 0.177 177.6 1891+ 342+
24 21 26.19 −15 56.6 18.936 0.177 167.7 1887+ 328+
Sept. 3 21 24.71 −16 03.7 18.991 0.177 157.7 1880+ 312+
13 21 23.36 −16 10.0 19.074 0.176 147.6 1870+ 297+
23 21 22.21 −16 15.3 19.182 0.176 137.6 1858+ 282+
Oct. 3 21 21.30 −16 19.4 19.312 0.175 127.5 1843+ 268+

COMETS C/1998 K16, 1998 K17, 2000 M2 Discovery positions for three SOHO Kreutz sungrazers: 1998 May

29.356 UT, α_{2000} = 4^{h}24^{m}.1, δ_{2000} = +19^{o}57′; May 31.040, 4^{h}27^{m}.8, +20^{o}01′; 2000 June 18.208, 5^{h}44^{m}.1, +21^{o}47′. Details are on MPEC 2000-N17.

2000 July 8  \begin{matrix}c \\ ◯ \end{matrix} Copyright 2000 CBAT  Brian G. Marsden