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IAUC 7814: C/2001 OG_108; C/2000 WM1

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                                                  Circular No. 7814
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 OG_108 (LONEOS)
     An apparently asteroidal object reported by LONEOS (discovery
observation below) was announced on MPEC 2001-P40 last Aug. 13.
Numerous observers could not detect any cometary activity, despite
the cometlike orbit.  Now approaching perihelion, the object has
finally shown cometary activity, detected by several observers as
indicated by the following reported total magnitudes and coma/tail
data from CCD images:  Jan. 11.44 UT, 16.1, 0'.4 coma, 0'.5 tail in
p.a. 230 deg (A. Nakamura, Kuma, Ehime, Japan, 0.60-m reflector);
22.39, 14.7, diffuse (S. Wakuda, Shizuoka, Japan, 0.25-m reflector);
Feb. 1.40, 13.5, 0'.9 coma, broad tail toward west with the longest
segment being 0'.9 long in p.a. 220 deg (Nakamura); 1.41, 12.8,
fan-shaped coma spanning p.a. 200-345 deg (T. Oribe, Saji, Tottori,
Japan, 1.03-m reflector).  Recent astrometry and the orbital
elements below appear on MPEC 2002-C04.

     2001 UT             R.A. (2000) Decl.        m2
     July 28.39388    1 46 17.02   +10 53 25.4   18.7

                    Epoch = 2002 Mar. 27.0 TT
     T = 2002 Mar. 15.20618 TT        Peri. = 116.41991
     e = 0.9252940                    Node  =  10.55525 2000.0
     q = 0.9940480 AU                 Incl. =  80.24516
       a = 13.3061362 AU   n = 0.02030608   P =  48.538 years

2002 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Jan. 26    21 30.13   +28 28.0   1.663   1.264   49.3   36.2   13.1
Feb.  5    21 30.99   +31 14.3   1.588   1.174   47.5   38.2   12.7
     15    21 32.24   +34 41.8   1.481   1.097   47.8   41.8   12.3
     25    21 33.72   +39 02.8   1.342   1.039   50.1   47.0   11.8
Mar.  7    21 35.61   +44 40.0   1.176   1.003   54.3   53.5   11.4
     17    21 38.74   +52 20.8   0.990   0.994   60.1   60.2   11.0
     27    21 46.01   +63 39.6   0.801   1.013   67.5   65.5   10.6


COMET C/2000 WM1 (LINEAR)
     Total naked-eye magnitude estimates of this comet (cf. IAUC
7809):  Jan. 29.78 UT, 3.0 (M. Mattiazzo, Wallaroo, S. Australia);
30.85, 2.8 (A. Pearce, Nedlands, W. Australia); 31.31, 3.2 (J. G.
de S. Aguiar, Campinas, Brazil); Feb. 2.31, 3.5 (A. Amorim,
Florianopolis, Brazil; moonlight).

                      (C) Copyright 2002 CBAT
2002 February 2                (7814)            Daniel W. E. Green

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