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IAUC 7739: C/2001 RX_14; 19P

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                                                  Circular No. 7739
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/2001 RX_14 (LINEAR)
     The linkage by the Minor Planet Center of subsequent
observations of an apparent main-belt minor planet observed by
LINEAR on Sept. 10 and 11 showed that this object, designated 2001
RX_14 on MPS 34978, had a nearly parabolic orbit.  After placement
on the NEO Confirmation Page, many further observations were
received, with M. Tichy (Klet, 0.57-m f/5.2 reflector + CCD) on
Oct. 18.7 UT indicating that the comet appeared to be diffuse with
a coma of diameter 13" and red mag 16.7.  R-band images taken by C.
Hergenrother and J. Barnes (Lunar and Planetary Laboratory) with
the 1.54-m Catalina reflector on Oct. 24.32 show a highly condensed
coma of diameter 6" and no hint of a tail.

     2001 UT             R.A. (2000) Decl.        m2
     Sept.10.32152    2 02 43.50   +22 36 57.9   18.8

The available astrometry, including prediscovery observations made
by the NEAT and LONEOS programs on Aug. 28, along with the
following parabolic orbital elements, appear on MPEC 2001-U46.

     T = 2003 Jan. 19.036 TT          Peri. = 121.496
                                      Node  =  14.171   2000.0
     q = 2.05903 AU                   Incl. =  30.560

2001 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Oct. 18     1 42.56   +23 15.1   4.273   5.246  166.0    2.6   16.9
     28     1 35.55   +23 08.5   4.189   5.163  167.1    2.5   16.7
Nov.  7     1 28.59   +22 56.3   4.137   5.080  160.0    3.8   16.6
     17     1 22.11   +22 40.5   4.115   4.996  150.1    5.7   16.6
     27     1 16.53   +22 23.5   4.120   4.913  139.5    7.5   16.5
Dec.  7     1 12.18   +22 07.9   4.149   4.829  128.9    9.1   16.4


COMET 19P/BORRELLY
     Visual m_1 estimates:  Sept. 1.11 UT, 10.0 (R. J. Bouma,
Groningen, The Netherlands, 0.25-m reflector); 28.14, 9.9 (W.
Hasubick, Buchloe, Germany, 25x100 binoculars); Oct. 11.08, 10.1
(B. H. Granslo, Fjellhamar, Norway, 0.20-m reflector); 18.68, 10.3
(Y. Nagai, Yamanashi, Japan, 0.32-m reflector); 24.96, 10.7 (V. S.
Nevski, Vitebsk, Belarus, 0.30-m reflector).

                      (C) Copyright 2001 CBAT
2001 October 25                (7739)            Daniel W. E. Green

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