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IAUC 7584: P/2000 WT_168; C/1999 T1

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                                                  Circular No. 7584
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/2000 WT_168
     After the publication (MPS 23043) of the initial observations
of the apparently asteroidal object 2000 WT_168 (discovery data
below), linkage to further observations (including prediscovery
data) showed the orbit to be cometary, although observations did
not show cometary activity in December (cf. MPEC 2000-Y21).  CCD
exposures taken with the 1.5-m reflector at Catalina on 2001 Feb.
13.3 UT by C. W. Hergenrother, however, do show the object to be
cometary (highly condensed 9".7 coma with red mag 16.3 and 8".0
tail in p.a. 110 deg).  Confirmation of cometary activity has been
obtained in CCD observations by J. Ticha and M. Tichy at Klet on
Feb. 16.9 (0.57-m reflector; 9" tail in p.a. 155 deg and faint
asymmetric coma) and by M. Hicks and B. Buratti at Palomar on Feb.
17.2 (1.5-m reflector; faint teardrop-shaped tail about 15" long in
p.a. 60 deg).

     2000 UT             R.A. (2000) Decl.        m2    Observer
     Nov. 25.43730    8 35 58.21   +13 46 16.8   17.2   LONEOS
          27.37208    8 37 22.96   +13 15 55.8   17.8   LINEAR

     The following orbital elements appear on MPEC 2001-D05, which
includes additional unpublished astrometry and an ephemeris:

                    Epoch = 2001 Apr.  1.0 TT
     T = 2001 Mar. 23.3229 TT         Peri. = 245.4986
     e = 0.546608                     Node  = 272.5524  2000.0
     q = 1.761729 AU                  Incl. =  18.5201
       a =  3.885661 AU    n = 0.1286787    P =   7.659 years


COMET C/1999 T1 (McNAUGHT-HARTLEY)
     Ephemeris from orbital elements on MPC 42106:

2001 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Feb. 10    16 47.57   +23 34.5   1.297   1.483   79.8   40.9    8.4
     20    17 14.12   +33 13.4   1.343   1.578   83.7   38.5    8.7
Mar.  2    17 39.23   +41 57.7   1.424   1.679   86.1   36.1    9.1
     12    18 02.25   +49 31.4   1.532   1.784   87.1   33.8    9.4
     22    18 22.44   +55 54.1   1.659   1.892   87.1   31.7    9.8
Apr.  1    18 38.91   +61 13.2   1.799   2.002   86.4   29.9   10.2
     11    18 50.62   +65 37.6   1.944   2.113   85.3   28.2   10.5
     21    18 56.35   +69 15.7   2.092   2.225   84.1   26.7   10.9

                      (C) Copyright 2001 CBAT
2001 February 17               (7584)            Daniel W. E. Green

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