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IAUC 8216: P/2003 T1; S/2001 U 3; (66063) 1998 RO_1

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                                                  Circular No. 8216
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET P/2003 T1 (TRITTON)
     The predicted total magnitudes in the following ephemeris
(H_10 = 10.0), from the elements on IAUC 8215, are necessarily
highly uncertain, as the comet is clearly in outburst when compared
to its 1978 apparition.

2003 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase   Mag.
Sept.28     8 42.41   +21 18.0   1.691   1.422   57.1   36.3   12.7
Oct.  3     8 58.26   +19 56.7   1.673   1.424   58.0   36.6   12.7
      8     9 13.59   +18 31.3   1.657   1.429   59.1   36.9   12.6
     13     9 28.37   +17 02.5   1.641   1.436   60.2   37.1   12.6
     18     9 42.61   +15 31.1   1.626   1.445   61.4   37.3   12.7
     23     9 56.28   +13 58.0   1.612   1.456   62.8   37.4   12.7
     28    10 09.40   +12 23.8   1.598   1.469   64.2   37.5   12.7


S/2001 U 3
     MPEC 2003-T29 has astrometry and orbital elements (a = 0.029
AU, e = 0.14, i = 147 deg, P = 267 days, H = 12.8) by B. G. Marsden
for a new Uranian satellite observed on 2001 Aug. 13, 25, and Sept.
21 by M. Holman, B. Gladman, and collaborators (see IAUC 7980).
Gladman identified further observations in 8.2-m UT3 Very Large
Telescope images taken by P. Rousselot and O. Mousis on 2002 Sept.
3 and 5.


(66063) 1998 RO_1
     P. Pravec, P. Kusnirak, and L. Sarounova, Ondrejov
Observatory; P. Brown and G. Esquerdo, University of Western
Ontario (UWO); D. Pray, Greene, RI, U.S.A.; L. A. M. Benner, Jet
Propulsion Laboratory (JPL); M. C. Nolan, National Astronomy and
Ionosphere Center; J. D. Giorgini and S. J. Ostro, JPL; and J.-L.
Margot, California Institute of Technology, report that photometric
observations -- obtained during 2003 Sept. 16-27 at Ondrejov, at
UWO, and by Pray -- show the near-earth object (66063) to be a
binary system with orbital period 14.53 hr.  The primary rotates
with a period of 2.492 hr, its low lightcurve amplitude indicative
of a nearly spheroidal shape.  The lightcurves suggest that the
secondary has an aspect ratio of about 1.5 and a rotation
synchronous with its orbital period.  Mutual eclipse/occultation
events indicate a secondary-to-primary mean diameter ratio of >/=
0.5.  Arecibo (2380-MHz, 13-cm) delay-Doppler radar observations,
obtained during Sept. 29-Oct. 4, show a spheroidal primary and an
elongated secondary with separations at least as large as 600 m.

                      (C) Copyright 2003 CBAT
2003 October 7                 (8216)            Daniel W. E. Green

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