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IAUC 6281: C/1995 Y1

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                                                  Circular No. 6281
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 Y1 (HYAKUTAKE)
     Additional positions, from G. Garradd (Loomberah, N.S.W.;
0.25-m f/4.1 reflector + CCD):

     1995 UT             R.A. (2000) Decl.
     Dec. 28.66561   14 28 10.94   -24 22 57.6
          28.68005   14 28 14.22   -24 22 49.3
          28.68786   14 28 16.06   -24 22 43.9
          28.70090   14 28 18.96   -24 22 35.4
          28.70584   14 28 20.03   -24 22 32.0

Garradd adds that a 300-s exposure showed a coma diameter of 2'.5
with a broad, 2'.5-long extension in p.a. 250 deg.  The coma lacked
a distinct central condensation in 5- and 10-s images; rather there
was a region of diameter about 10" of relatively uniform brightness.
     The following preliminary parabolic orbital elements, by the
undersigned, are from 18 observations, Dec. 26-28:

     T = 1996 Feb. 23.938 TT          Peri. =  45.516
                                      Node  = 195.863   2000.0
     q = 1.06376 AU                   Incl. =  54.220

1995/96     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Dec. 19    13 53.16   -25 39.9   1.897   1.514   52.4   31.0   10.7
     24    14 10.86   -25 06.5   1.812   1.461   53.5   32.8   10.4
     29    14 29.45   -24 19.4   1.730   1.409   54.5   34.6   10.2
Jan.  3    14 48.96   -23 16.5   1.650   1.359   55.4   36.6    9.9
      8    15 09.44   -21 55.6   1.574   1.312   56.2   38.5    9.7
     13    15 30.88   -20 14.4   1.503   1.267   56.8   40.5    9.4
     18    15 53.25   -18 11.2   1.437   1.225   57.2   42.4    9.2
     23    16 16.48   -15 44.6   1.379   1.187   57.4   44.3    8.9
     28    16 40.47   -12 54.5   1.330   1.154   57.5   46.0    8.7
Feb.  2    17 05.08   - 9 42.6   1.290   1.124   57.4   47.5    8.6
      7    17 30.14   - 6 12.1   1.262   1.100   57.0   48.7    8.4

     Total visual magnitude estimates:  Dec. 26.86 UT, 10.5 (Y.
Hyakutake, Hayato, Japan, 25x150 binoculars); 27.52, 10.2 (A. Hale,
Cloudcroft, NM, 0.41-m reflector; coma diameter about 4').


1995 December 28               (6281)            Daniel W. E. Green

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