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IAUC 6224: C/1995 O1

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                                                  Circular No. 6224
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
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)
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1995 O1 (HALE-BOPP)
     Continuation to the ephemeris on IAUC 6202:

1995 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Sept.30    18 16.16    -29 20.5    6.536    6.562   87.1    8.8     10.2
Oct. 10    18 16.66    -28 52.7    6.618    6.474   77.4    8.7     10.2
     20    18 18.26    -28 25.4    6.693    6.386   67.9    8.3     10.2
     30    18 20.87    -27 58.6    6.758    6.297   58.6    7.7     10.1
Nov.  9    18 24.37    -27 32.1    6.807    6.208   49.4    7.0     10.1
     19    18 28.67    -27 05.8    6.838    6.118   40.3    6.0     10.0
     29    18 33.64    -26 39.4    6.848    6.027   31.4    4.9     10.0

     This ephemeris continuation is from new orbital elements computed
from 597 observations extending to Sept. 3 and issued today on MPC 25623.
The near-perihelic (T = 1997 Mar. 31.96) ephemeris below revises that on
IAUC 6202.  Although the computation depends heavily on R. H. McNaught's
measurement of a presumed image of the comet in 1993 (IAUC 6198),
an orbit computed independently from the 1995 observations alone does now
confirm that the comet can not be 'new' in the Oort sense.  There is thus
some justification for the use of an r**-4 law for the computation
of the total magnitude m1, although the comet could easily be two magnitudes
fainter (or, conceivably, brighter) than indicated.  R. M. West, European
Southern Observatory, reports that 1-m Schmidt plates taken on 1993 May 26
and 1994 Aug. 4 just miss the region where the comet would have been.  It
therefore seems unlikely that other pre-1995 images of the comet exist.

1997 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Feb.  1    19 40.62    +15 32.1    2.002    1.366   37.9   26.3      0.9
     11    20 08.00    +20 54.0    1.805    1.250   41.5   31.5      0.2
     21    20 43.91    +27 26.5    1.617    1.142   44.3   37.2     -0.4
Mar.  3    21 33.91    +34 53.2    1.458    1.049   46.0   42.8     -1.0
     13    22 45.56    +41 54.5    1.350    0.975   46.1   47.3     -1.5
     23     0 20.05    +45 42.1    1.315    0.928   44.8   49.1     -1.7
Apr.  2     1 57.42    +44 06.3    1.359    0.915   42.3   47.4     -1.7
     12     3 13.80    +38 32.1    1.469    0.935   39.0   42.5     -1.5
     22     4 06.90    +31 45.6    1.620    0.988   35.3   36.0     -1.0
May   2     4 44.35    +25 17.8    1.789    1.067   31.4   29.5     -0.5
     12     5 12.53    +19 33.7    1.960    1.164   27.6   23.8      0.1
     22     5 35.20    +14 31.2    2.123    1.273   24.5   19.2      0.7
June  1     5 54.46    +10 01.4    2.274    1.390   22.3   16.1      1.2


1995 September 9               (6224)              Brian G. Marsden

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