Circular No. 6474

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 P/1996 R2 (LAGERKVIST)

The following precise CCD positions have been reported:

1996 UT α_{2000} δ_{2000} m_{1} Observer
Sept.12.81936 22^{h}34^{m}02.^{s}00 −12^{o}48′43′′.4 17.0 Tichý
12.89045 22 33 59.23 −12 48 54.3  Giuliani
12.91852 22 33 58.06 −12 48 59.0  _{”}
13.92553 22 33 19.31 −12 51 44.9  Boschin
13.96167 22 33 17.89 −12 51 51.1 17.1 Laurie
13.97166 22 33 17.52 −12 51 52.6  Boschin
14.00688 22 33 16.20 −12 51 57.9  Laurie
14.48819 22 32 58.18 −12 53 13.9 17.6 Abe
14.50087 22 32 57.68 −12 53 16.2  _{”}
14.52637 22 32 56.67 −12 53 20.6  Ito
14.55201 22 32 55.65 −12 53 24.0  _{”}
14.59757 22 32 53.84 −12 53 31.9 16.9 Nakamura
14.60712 22 32 53.50 −12 53 33.1  _{”}

M. Tichý (Klet). 0.57-m f/5.2 reflector. V. Giuliani (Sormano). 0.5-m reflector. W. Boschin, L. Drigo, G. Lombardi, E. Pettarin, and F. Piani (Farra

d’Isonzo). 0.40-m f/4.5 reflector. Measurer Pettarin. S. P. Laurie (Church Stretton). 0.25-m Schmidt-Cassegrain + focal reducer. H. Abe (Yatsuka). 0.26-m f/6.0 reflector. Communicated by S. Nakano. K. Ito (Nishi Kobe). 0.20-m f/4.0 reflector. Communicated by Nakano. A. Nakamura (Kuma Kogen). 0.60-m f/6.0 Ritchey-Chrétien.

Preliminary orbital elements from 17 observations, Sept. 11–14:

T = 1997 Jan. 30.55 TT  ω = 339.^{o}83
e = 0.3685  Ω = 40.72 }2000.0
q = 2.4783 AU  i = 2.55

a = 3.9245 AU n^{o} = 0.12677 P = 7.77 years

1996TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Sept. 14 22^{h}33.^{m}28 −12^{o}51.^{′}9 1.659 2.639 163.^{o}3 6.^{o}3 16.8
19 22 30.25 −13 03.9 1.670 2.628 157.8  8.3 16.8
24 22 27.60 −13 13.0 1.687 2.617 152.3 10.3 16.8
29 22 25.40 −13 18.7 1.710 2.607 146.9 12.1 16.8
Oct. 4 22 23.71 −13 20.9 1.738 2.597 141.6 13.8 16.8
1996 September 14  \begin{matrix}c \\ ◯ \end{matrix} Copyright 1996 CBAT  Daniel W. E. Green