Circular No. 6191

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)

Additional precise positions:

1995 UT α_{2000} δ_{2000} m_{1} Observer
July 25.84209 18^{h}42^{m}13.^{s}68 −32^{o}06′26′′.9  Vagnozzi
25.84215 18 42 13.76 −32 06 26.5  Tichá
25.84487 18 42 13.68 −32 06 26.8  _{”}
25.84571 18 42 13.65 −32 06 27.0  _{”}
25.84652 18 42 13.60 −32 06 27.0  _{”}
25.84733 18 42 13.59 −32 06 27.0  _{”}
25.85877 18 42 13.14 −32 06 26.1  Vagnozzi
25.89150 18 42 11.72 −32 06 21.8 12.2 Meyer
25.89330 18 42 11.56 −32 06 21.7 12.2  _{”}
25.89447 18 42 11.61 −32 06 21.8 12.2  _{”}
25.89551 18 42 11.54 −32 06 20.9 12.2  _{”}
26.37855 18 41 51.14 −32 05 30.5  Garradd
26.38248 18 41 51.04 −32 05 30.9  _{”}
26.39447 18 41 50.53 −32 05 29.5  _{”}
26.50576 18 41 45.74 −32 05 19.4  _{”}

A. Vagnozzi, G. Bernabei, V. Risoldi, E. Gregori, F. Lombardi, and D.

Paluzzi (Santa Lucia Stroncone). 0.50-m f/2.8 Ritchey-Chrétien + CCD. J. Tichá and M. Tichý (Kleť). 0.57-m f/5.2 reflector + CCD. E. Meyer and H. Raab (Linz). 0.3-m f/5.2 Schmidt-Cassegrain + CCD. G. J. Garradd (Loomberah, N.S.W.). 0.25-m f/4.1 reflector + CCD.

The following parabolic orbital elements, from 57 observations July 24–26, are highly uncertain:

T = 1997 Jan. 26.83 TT  ω = 131.^{o}06
Ω = 285.82 }2000.0
q = 0.8025 AU  i = 67.11
1995 TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
July 22 18^{h}44.^{m}97 −32^{o}12.^{′}4 5.762 6.719 158.^{o}8 3.^{o}1 10.6
27 18 41.42 −32 04.5 5.749 6.675 153.8 3.9 10.5
Aug. 1 18 38.00 −31 55.4 5.743 6.631 148.7 4.6 10.5
6 18 34.76 −31 45.3 5.744 6.586 143.4 5.3 10.5
11 18 31.73 −31 34.3 5.751 6.542 138.2 5.9 10.5

1995 July 26 Daniel W. E. Green