Central Bureau for Astronomical Telegrams

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IAUC 7515: C/2000 U5; P/2000 U6

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                                                  Circular No. 7515
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 C/2000 U5 (LINEAR)
      An object with unusual motion that was reported as asteroidal
by the LINEAR survey (discovery observation below) and posted on
the NEO Confirmation Page has been found to be cometary by other
observers.  The object seemed diffuse with a 14" coma and 18" tail
in p.a. 170 deg on CCD images obtained by J. Ticha and M. Tichy
(Klet) on Oct. 30.0 UT.  Images taken on Oct. 30.2 by D. A.
Klinglesmith III (Socorro, NM) show slight diffuseness and a tail
about 20" long in p.a. 220 deg; images by Y. Ikari (Moriyama,
Japan) also show a tail in p.a. 220 deg on Oct. 30.6.  J. Biggs
(Perth Observatory) notes that images of C/2000 U5 were larger than
nearby stars and elongated toward the south-southwest on Oct. 31.6.
D. T. Durig (Sewanee, TN) found a tail about 25" long in p.a. 170
deg on Nov. 1.4 images.

     2000 UT             R.A. (2000) Decl.        m2
     Oct. 29.38178    5 06 33.49   + 2 04 56.6   17.1

MPEC 2000-V02 contains the available astrometry and the parabolic
orbital elements that produced the following ephemeris:

2000 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Oct. 23     5 13.36   + 1 26.7   2.699   3.413  128.9   13.1   14.5
Nov.  2     5 02.36   + 2 28.2   2.679   3.501  140.4   10.4   14.6
     12     4 49.81   + 3 38.0   2.687   3.590  151.8    7.5   14.7
     22     4 36.45   + 4 55.0   2.729   3.678  161.2    5.0   14.8
Dec.  2     4 23.16   + 6 17.3   2.809   3.767  164.1    4.1   15.0


COMET P/2000 U6 (TICHY)
      An object found by Milos Tichy on images taken at Klet with
J. Ticha and M. Kocer on Oct. 23 (discovery observation below),
originally reported as asteroidal, was subsequently noted to be
diffuse on Klet images taken during Oct. 28.9-29.2 UT; Tichy also
noted a 10" coma on Oct. 29.8 images.  Images obtained on Nov. 1 by
S. Sanchez and M. Blasco at Mallorca and by D. T. Durig at Sewanee
also showed diffuseness.  MPEC 2000-V03 contains the available
astrometry and orbital elements (T = 2000 Oct. 4.6 TT, i = 19.3
deg, q = 2.150 AU, P = 7.3 yr).

     2000 UT             R.A. (2000) Decl.        m2
     Oct. 23.07698    3 06 57.01   +28 51 38.9   17.8

                      (C) Copyright 2000 CBAT
2000 November 1                (7515)            Daniel W. E. Green

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