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IAUC 8244: P/2001 RG_100; (65803) 1996 GT

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IAUC number

                                                  Circular No. 8244
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

COMET P/2001 RG_100 (LINEAR)
     CCD exposures taken by A. E. Gleason with the 0.9-m f/3
Spacewatch reflector at Kitt Peak on Nov. 26.4 UT show that the
object 2001 RG_100 (LINEAR discovery observation from MPS 36374
given below) is definitely a comet, showing a nuclear condensation
of diameter approximately 6" and a tail 18" long in p.a. 265 deg.
Following a request from the Minor Planet Center, J. Young reports
that CCD images taken at Table Mountain on Nov. 27 show a 4" coma
with a broad, faint tail extending approximately 12" in p.a. 265

     2001 UT             R.A. (2000) Decl.       Mag.
     Sept.12.26331   22 45 31.47   -12 12 40.2   19.1

The following orbital elements by B. G. Marsden are from
observations published in the MPSs.

                    Epoch = 2002 July 25.0 TT
     T = 2002 July 25.7649 TT         Peri. = 235.5880
     e = 0.028930                     Node  = 137.3131  2000.0
     q = 4.595048 AU                  Incl. =   7.9031
       a =  4.731943 AU    n = 0.0957513    P =  10.293 years

(65803) 1996 GT
     P. Pravec, Ondrejov Observatory; L. A. M. Benner, Jet
Propulsion Laboratory (JPL); M. C. Nolan, National Astronomy and
Ionosphere Center; P. Kusnirak, Ondrejov Observatory; D. Pray,
Greene, RI, U.S.A.; J. D. Giorgini, R. F. Jurgens, and S. J. Ostro,
JPL; J.-L. Margot, University of California, Los Angeles; C. Magri,
University of Maine at Farmington; A. Grauer, University of
Arkansas at Little Rock; and S. Larson, University of Arizona,
report that photometric observations -- obtained during Nov. 20-24
at Ondrejov, at Steward Observatory, and by Pray -- show that
(65803) is a binary system with an orbital period of 11.9 hr.  The
primary rotates with a period of 2.26 hr, and its lightcurve
amplitude of 0.10 mag is indicative of a nearly spheroidal shape.
Mutual eclipse/occultation events 0.05-0.08 mag deep indicate a
secondary-to-primary mean-diameter ratio of 0.2.  Arecibo radar
delay-Doppler images (2380 MHz, 12.6 cm) obtained on Nov. 23 and 24
independently confirm that (65803) is a binary system.  Preliminary
estimates of the diameters, based on images at 15-m resolution, are
approximately 800 and approximately 150 m.

                      (C) Copyright 2003 CBAT
2003 November 28               (8244)            Daniel W. E. Green

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