Circular No. 6534

Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION

Mailstop 18, 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)

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Phone 617-495-7244/7440/7444 (for emergency use only)

COMET C/1997 A1 (NEAT)

Further precise CCD positions have been reported as follows:

1997 UT α_{2000} δ_{2000} m_{1} Observer
Jan. 9.65247 9^{h}40^{m}54.^{s}40 +16^{o}09′29′′.4 18.5 Kobayashi
9.67270 9 40 51.96 +16 09 52.0  _{”}
11.38658 9 37 40.78 +16 43 27.4 18.9 Helin
11.40340 9 37 38.85 +16 43 46.6 18.7  _{”}
11.61977 9 37 13.96 +16 48 03.6 18.2  _{”}
11.63868 9 37 11.67 +16 48 25.7 18.2  _{”}
11.79751 9 36 53.65 +16 51 34.7 19.4 Zhu
11.80222 9 36 53.07 +16 51 40.8  _{”}
12.44963 9 35 38.41 +17 04 33.5 18.6 Helin
12.47042 9 35 35.91 +17 04 58.7 18.7  _{”}
12.58014 9 35 23.25 +17 07 08.9  Abe
12.58494 9 35 22.68 +17 07 15.0  _{”}
12.58889 9 35 22.21 +17 07 19.8 18.5 Sugie
12.59722 9 35 21.20 +17 07 30.0  _{”}

T. Kobayashi (Oizumi). 0.25-m f/4.4 reflector. Prediscovery images. E. Helin, K. J. Lawrence, S. Pravdo and D. L. Rabinowitz (Haleakala-

NEAT/GEODSS). 1-m f/2.2 Ritchey-Chrétien. J. Zhu and L. J. Ma (Xinglong). 0.60-m Schmidt. Measurer Zhu. H. Abe (Yatsuka). 0.26-m f/6.0 reflector. Communicated by S. Nakano. A. Sugie (Dynic). 0.60-m f/3.7 reflector. Communicated by Nakano.

Parabolic orbital elements from 16 observations Jan. 9–12:

T = 1997 June 17.208 TT  ω = 39.^{o}270
Ω = 135.774 }2000.0
q = 3.17375 AU  i = 145.069
1997 TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Jan. 12 9^{h}36.^{m}51 +16^{o}55.^{′}6 2.616 3.508 150.^{o}9 7.^{o}8 18.5
17 9 26.41 +18 37.0 2.554 3.489 158.6 5.9 18.5
22 9 15.40 +20 21.3 2.505 3.469 166.3 3.8 18.4
27 9 03.57 +22 06.3 2.471 3.450 173.0 2.0 18.3
Feb. 1 8 51.11 +23 49.5 2.452 3.432 173.1 2.0 18.3
6 8 38.22 +25 28.6 2.448 3.414 166.3 3.9 18.3
11 8 25.16 +27 01.3 2.460 3.397 158.5 6.1 18.3
1997 January 12  \begin{matrix}c \\ ◯ \end{matrix} Copyright 1997 CBAT  Brian G. Marsden