Circular No. 7248

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION

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PROBABLE NEW SATELLITES OF URANUS There follow Palomar 5-m observations in August by B. Gladman,

Observatoire de la Côte d’Azur; and P. Nicholson and J. Burns, Cornell University, of the probable satellites S/1999 U 1 and U 2, together with July Mauna Kea observations by J. J. Kavelaars et al. (see IAUC 7230) and August Palomar observations of a probable new satellite S/1999 U 3:

1999 UT  α_{2000}  δ_{2000}  R
Aug. 8.34182  21^{h}11^{m}43.^{s}76  −16^{o}54′26′′.2  23.2  S/1999 U 1
9.32396  21 11 34.45  −16 55 09.2  23.1
Aug. 9.27571  21 10 12.46  −17 06 25.9  24.2  S/1999 U 2
9.34726  21 10 11.76  −17 06 28.9  23.9
July 18.52608  21 12 55.18  −16 47 38.0  S/1999 U 3
18.58036  21 12 54.68  −16 47 40.2
Aug. 8.35032  21 09 39.01  −17 01 47.8
9.30043  21 09 29.88  −17 02 28.0  23.0

The following ephemerides, by the undersigned, are from direct, apocentric, uranicentric orbits having e = 0.4. The possibility that some or all of the objects are centaurs can still not be excluded.

1999 TT α_{2000} δ_{2000} Δ r_{U} ϵ Δα′′ Δδ′′
Aug. 30 21^{h}08.^{m}41 −17^{o}09.^{′}4 18.990 0.155 158.^{o}2 1579+ 578+
Sept. 9 21 07.04 −17 15.4 19.067 0.155 148.2 1579+ 563+
19 21 05.88 −17 20.4 19.170 0.155 138.2 1576+ 548+
29 21 04.95 −17 24.4 19.295 0.155 128.1 1570+ 533+
Oct. 9 21 04.31 −17 27.0 19.438 0.155 118.1 1561+ 518+
Aug. 30 21 06.95 −17 21.4 18.921 0.061 157.8 329+ 144−
Sept. 9 21 05.56 −17 27.7 19.002 0.061 147.8 299+ 176−
19 21 04.35 −17 33.0 19.108 0.060 137.7 268+ 206−
29 21 03.40 −17 37.1 19.236 0.059 127.7 236+ 233−
Oct. 9 21 02.73 −17 39.9 19.383 0.058 117.7 203+ 259−
Aug. 30 21 06.36 −17 16.8 18.980 0.022 157.7 180− 136+
Sept. 9 21 05.06 −17 23.1 19.065 0.019 147.7 125− 98+
19 21 03.99 −17 28.9 19.173 0.015 137.7  46− 42+
29 21 03.18 −17 33.7 19.298 0.012 127.7  46+ 26−
Oct. 9 21 02.62 −17 36.9 19.434 0.012 117.7 109+ 75−
1999 September 4  \begin{matrix}c \\ ◯ \end{matrix} Copyright 1999 CBAT  Brian G. Marsden