Circular No. 6644

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)

    URL http://cfa-www.harvard.edu/cfa/ps/cbat.html

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

COMET C/1997 J1 (MUELLER)

Selected precise CCD positions have been reported as follows:

1997 UT α_{2000} δ_{2000} m_{1} Observer
May 5.90589 11^{h}12^{m}18.^{s}78 +74^{o}47′07′′.7  Tichy̌
5.90854 11 12 17.34 +74 47 04.0 12.5  _{”}
5.94664 11 11 56.17 +74 46 11.1 15.1 Šarounová
5.95730 11 11 50.10 +74 45 56.2  _{”}
6.49317 11 06 59.55 +74 33 25.8  Ito
6.49652 11 06 57.62 +74 33 21.4  _{”}
6.49876 11 06 56.42 +74 33 17.7 13.1 Sugie
6.50293 11 06 54.13 +74 33 11.9  _{”}
6.58257 11 06 11.43 +74 31 17.2 13.2 Ikari
6.59171 11 06 06.64 +74 31 04.1  _{”}
6.60449 11 05 59.96 +74 30 45.6  Asami
6.60640 11 05 58.95 +74 30 42.2 13.9  _{”}
6.92538 11 03 12.36 +74 23 01.2 13.9 Maury
6.94184 11 03 03.85 +74 22 37.0 14.0  _{”}

M. Tichý and Z. Moravec (Kleť). 0.57-m f/5.2 reflector. L. Šarounová (Ondřejov). 0.65-m f/3.6 reflector. K. Ito (Nishi Kobe). 0.25-m f/6.3 Schmidt-Cassegrain. A. Sugie (Dynic). 0.60-m f/5.0 reflector. Communicated by S. Nakano. Y. Ikari (Moriyama). 0.25-m f/6.3 reflector. Communicated by Nakano. A. Asami (Hadano). 0.28-m f/5.0 reflector. Communicated by Nakano. A. Maury, D. Albanese and G. Hahn (Caussols-ODAS). 0.9-m Schmidt.

Parabolic orbital elements from 16 observations May 3–6:

T = 1997 May 2.178 TT  ω = 98.^{o}244
Ω = 276.957 }2000.0
q = 2.30228 AU  i = 122.982
1997TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
May 2 11^{h}53.^{m}6 +76^{o}04.^{′}0 2.153 2.302 85.^{o}4 25.^{o}9 12.8
7 11 02.6 +74 21.2 2.219 2.303 81.8 25.7 12.9
12 10 26.9 +72 08.2 2.291 2.305 78.1 25.4 12.9
17 10 02.57 +69 43.6 2.368 2.308 74.3 24.9 13.0
22 9 46.01 +67 17.8 2.447 2.313 70.4 24.3 13.1
27 9 34.66 +64 56.1 2.529 2.319 66.5 23.6 13.2
June 1 9 26.86 +62 41.0 2.612 2.327 62.6 22.8 13.3
1997 May 6  \begin{matrix}c \\ ◯ \end{matrix} Copyright 1997 CBAT  Brian G. Marsden