Circular No. 6471

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/1996 R1 (HERGENROTHER-SPAHR) Further precise CCD positions have been reported as follows:

1996 UT α_{2000} δ_{2000} m_{1} Observer
Sept.8.89868 23^{h}48^{m}27.^{s}52 +37^{o}58′36′′.2  Sicoli
8.90223 23 48 25.91 +37 58 24.7  _{”}
8.94025 23 48 09.18 +37 56 20.8 14.0 Tichá
8.95067 23 48 04.61 +37 55 48.8  _{”}
9.17917 23 46 25.22 +37 43 26.2  Rogers
9.21042 23 46 11.58 +37 41 44.3 13.1  _{”}
9.21192 23 46 10.83 +37 41 39.8 13.2 Offutt
9.22843 23 46 03.53 +37 40 45.8 13.4  _{”}
9.89366 23 41 13.29 +37 03 35.1  Ewen-Smith
9.90273 23 41 09.37 +37 03 04.8  _{”}
9.90477 23 41 08.24 +37 02 57.2  Šarounová
9.91133 23 41 05.37 +37 02 34.7  _{”}

P. Sicoli and F. Manca (Sormano). 0.5-m reflector. J. Tichá and M. Tichý (Kleť). 0.57-m f/5.2 reflector. J. E. Rogers (Camarillo). 0.25-m Schmidt-Cassegrain. W. Offutt (Cloudcroft). 0.6-m f/7 Ritchey-Chrétien. B. Ewen-Smith and C. Durman (Portimão). 0.5-m reflector. L. Šarounová (Ondřejov). 0.65-m f/3.6 reflector.

Parabolic orbital elements from 21 observations Sept. 7–9:

T = 1996 Aug. 28.566 TT  ω = 139.^{o}250
Ω = 149.648 }2000.0
q = 1.90096 AU  i = 145.876
1996TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Sept. 8 23^{h}55.^{m}00 +38^{o}45.^{′}5 1.061 1.905 134.^{o}2 22.^{o}3 11.9
10 23 40.45 +36 57.6 1.038 1.907 137.7 20.8 11.9
12 23 26.01 +34 56.4 1.020 1.909 140.9 19.4 11.9
14 23 11.87 +32 42.8 1.006 1.912 143.7 18.1 11.8
16 22 58.16 +30 18.4 0.998 1.915 145.9 17.1 11.8
18 22 45.01 +27 45.2 0.994 1.918 147.3 16.4 11.8
20 22 32.52 +25 05.6 0.996 1.921 147.8 16.2 11.8
22 22 20.75 +22 22.3 1.003 1.925 147.3 16.3 11.9
24 22 09.74 +19 37.8 1.014 1.929 146.0 16.9 11.9

1996 September 9  \begin{matrix}c \\ ◯ \end{matrix} Copyright 1996 CBAT  Brian G. Marsden