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IAUC 6704: P/1997 N2

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                                                  Circular No. 6704
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)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET P/1997 N2 (HELIN-ROMAN-ALU 2)
     Comet P/1989 U1 (= 1989y = 1989 XVI) has been recovered on CCD
frames obtained by C. W. Hergenrother with the Smithsonian Astrophysical
Observatory's 1.2-m reflector on Mt. Hopkins.  Candidate images among
several measured by T. B. Spahr and motion-checked by G. V. Williams show
some possible very slight diffuseness on July 13, and this is more evident
on a coaddition of the two-night total exposure of 12 min, a short tail
then also being evident in p.a. 250 deg.  The indicated correction to the
prediction by B. G. Marsden on MPC 23483 (ephemeris on MPC 29154) is
Delta T = -0.6 day.

     1997 UT             R.A. (2000) Decl.        m2
     July 13.45823    1 00 00.27   + 7 36 20.4
          13.46002    1 00 00.43   + 7 36 20.9
          13.46183    1 00 00.59   + 7 36 21.8
          14.43271    1 01 26.89   + 7 43 01.7   19.6
          14.43450    1 01 27.06   + 7 43 02.7
          14.43628    1 01 27.21   + 7 43 03.3

     The following orbital elements by Williams satisfy 16 observations
1989-1997 with mean residual 1".0:

                    Epoch = 1997 Nov.  8.0 TT
     T = 1997 Nov. 10.0833 TT         Peri. = 220.9513
     e = 0.531645                     Node  = 178.4818  2000.0
     q = 1.910084 AU                  Incl. =   5.7751
       a =  4.078279 AU    n = 0.1196709    P =   8.236 years

1997 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m2
July 21     1 11.00    + 8 25.7    1.752    2.154   98.7   27.8     20.1
     31     1 24.92    + 9 21.1    1.616    2.116  104.8   27.6     19.9
Aug. 10     1 37.79    +10 03.1    1.487    2.080  111.1   27.0     19.7
     20     1 49.28    +10 29.3    1.368    2.047  117.9   25.9     19.4
     30     1 59.01    +10 37.6    1.258    2.017  125.3   24.1     19.1
Sept. 9     2 06.53    +10 26.2    1.160    1.990  133.3   21.6     18.9
     19     2 11.52    + 9 54.4    1.076    1.967  142.0   18.3     18.6
     29     2 13.78    + 9 03.5    1.008    1.948  151.4   14.3     18.3
Oct.  9     2 13.40    + 7 57.3    0.959    1.932  161.2    9.6     18.0
     19     2 10.99    + 6 43.6    0.931    1.921  170.6    4.9     17.7
     29     2 07.52    + 5 32.3    0.925    1.913  172.0    4.1     17.6

                      (C) Copyright 1997 CBAT
1997 July 21                   (6704)              Brian G. Marsden

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