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IAUC 6202: C/1995 O1

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                                                  Circular No. 6202
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 6191 (elements IAUC 6198):

1995 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Aug. 11    18 31.67    -31 34.6    6.207    6.995  138.2    5.5     10.4
     21    18 26.26    -31 10.6    6.244    6.910  127.7    6.7     10.4
     31    18 21.92    -30 44.4    6.302    6.824  117.3    7.6     10.3
Sept.10    18 18.77    -30 16.9    6.373    6.738  107.1    8.2     10.3
     20    18 16.86    -29 48.8    6.453    6.651   97.0    8.6     10.3
     30    18 16.17    -29 20.6    6.537    6.564   87.1    8.8     10.2

     Total magnitude estimates (visual unless otherwise stated):
July 17.89 UT, 11.5 +/- 0.5 (P. Riepe, B. Schrvter, H. Tomsik and
S. Binnewies, Windhoek, Namibia; 0.135-m f/4.0 lens, Scotchchrome 400;
prediscovery photograph); 18.92, 11.5 +/- 0.5 (Riepe et al.,
prediscovery photograph); 31.09, 10.4 (J. Bortle, Stormville, NY,
0.41-m reflector); Aug. 1.11, 10.3 (Bortle); 2.18, 10.8 (A. Hale,
Cloudcroft, NM, 0.41-m reflector).

     The following near-perihelic ephemeris is provided.  It must be
stressed that the computation depends critically on the reality of the
single 1993 Apr. 27 observation (IAUC 6198) and on the assumption that
the comet has not been significantly in outburst (but see IAUC 6194).
Taking the situation at face value, one can note that comet C/1995 O1
is in many respects similar to the great comet C/1811 F1 (early absolute
brightness, perihelion distance, orbital inclination, 3000-year revolution
period, placement beyond the sun at perihelion) and may perform as
spectacularly.

1997 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Feb.  1    19 40.35    +15 18.8    2.012    1.373   37.8   26.1      0.9
     11    20 07.44    +20 38.3    1.815    1.256   41.3   31.2      0.3
     21    20 42.87    +27 08.3    1.627    1.148   44.2   36.9     -0.3
Mar.  3    21 32.05    +34 34.1    1.467    1.053   45.9   42.5     -0.9
     13    22 42.51    +41 40.2    1.356    0.978   46.1   47.0     -1.4
     23     0 16.14    +45 41.3    1.317    0.929   44.7   49.0     -1.7
Apr.  2     1 53.97    +44 21.1    1.358    0.913   42.3   47.4     -1.7
     12     3 11.52    +38 54.5    1.465    0.932   39.0   42.6     -1.5
     22     4 05.54    +32 08.6    1.615    0.983   35.2   36.2     -1.0
May   2     4 43.56    +25 38.4    1.782    1.059   31.3   29.6     -0.5
     12     5 12.07    +19 51.2    1.953    1.155   27.5   23.8      0.1
     22     5 34.94    +14 46.0    2.116    1.264   24.3   19.3      0.6
June  1     5 54.33    +10 13.7    2.266    1.381   22.2   16.1      1.2


1995 August 4                  (6202)              Brian G. Marsden

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