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IAUC 7648: P/2001 M1

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                                                  Circular No. 7648
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/2001 M1 (HELIN)
     M. Busch, A. Seib, F. Hormuth, and R. Stoss, Starkenburg-
Sternwarte, Heppenheim; and A. Gnadig and A. Doppler, Archenhold-
Sternwarte, Berlin, report the recovery of P/1987 Q3 (= 1987w =
1987 XVII) on CCD images taken by Busch, Seib, and Hormuth with the
EOCA 1.52-m reflector at Calar Alto, with the astrometry given
below (measurements by Stoss, Gnadig, and Doppler).  The indicated
correction to the prediction by B. G. Marsden on MPC 31664
(ephemeris on MPC 42160) is Delta(T) = -1.0 day.

     2001 UT             R.A. (2000) Decl.        m1
     June 20.14176   23 35 15.00   - 3 23 01.7    20
          20.14339   23 35 15.09   - 3 23 01.1
          21.12868   23 36 16.86   - 3 18 16.9
          21.13032   23 36 17.01   - 3 18 15.6
          21.13365   23 36 17.21   - 3 18 14.9

     The following new orbital elements by Marsden are from 28
observations, 1987-2001 (mean residual 0".7):

                    Epoch = 2001 Sept. 8.0 TT
     T = 2001 Sept.23.7154 TT         Peri. = 215.4212
     e = 0.565600                     Node  = 143.5365  2000.0
     q = 2.530770 AU                  Incl. =   4.7171
       a =  5.825893 AU    n = 0.0700907    P =  14.062 years

2001 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
June 20    23 35.10   - 3 23.7   2.343   2.646   95.8   22.5   18.2
     30    23 44.99   - 2 39.9   2.205   2.624  102.8   22.2   18.0
July 10    23 53.50   - 2 07.2   2.073   2.604  110.1   21.5   17.8
     20     0 00.38   - 1 47.4   1.949   2.586  118.0   20.3   17.6
     30     0 05.40   - 1 42.0   1.836   2.571  126.3   18.6   17.5
Aug.  9     0 08.40   - 1 51.9   1.736   2.558  135.2   16.2   17.3
     19     0 09.26   - 2 17.0   1.653   2.547  144.7   13.3   17.2
     29     0 08.08   - 2 55.5   1.589   2.539  154.8    9.7   17.1
Sept. 8     0 05.17   - 3 43.6   1.547   2.534  165.2    5.8   17.0
     18     0 01.10   - 4 35.9   1.529   2.531  174.6    2.2   17.0
     28    23 56.65   - 5 25.7   1.537   2.531  170.9    3.6   17.0
Oct.  8    23 52.70   - 6 06.2   1.569   2.533  160.5    7.6   17.0
     18    23 49.98   - 6 32.7   1.626   2.538  150.0   11.3   17.1
     28    23 49.08   - 6 41.9   1.704   2.546  139.9   14.5   17.2

                      (C) Copyright 2001 CBAT
2001 June 21                   (7648)            Daniel W. E. Green

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