Circular No. 6563

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 D1 (MUELLER)

The following precise CCD positions have been reported:

1997 UT α_{2000} δ_{2000} m_{1} Observer
Feb. 20.22830 12^{h}41^{m}21.^{s}59 +47^{o}24′13′′.3  Rogers
20.26997 12 41 14.82 +47 25 09.4 15.8  _{”}
20.51736 12 40 35.44 +47 30 30.6 14.6 Sugie
20.52847 12 40 33.62 +47 30 44.9  _{”}
20.55087 12 40 30.01 +47 31 14.5 15.1 Nakamura
20.55920 12 40 28.69 +47 31 25.1  _{”}
20.69031 12 40 07.62 +47 34 14.5 14.6 Zhou
20.70486 12 40 05.25 +47 34 33.5  _{”}

J. Rogers (Camarillo). 0.25-m Schmidt-Cassegrain. A. Sugie (Dynic). 0.60-m f/5.0 reflector. Communicated by S. Nakano. A. Nakamura (Kuma Kogen). 0.60-m reflector. Communicated by Nakano. X. Zhou, X. Y. Li, J. Zhu, R. H. Liu and Y. K. Kim (Xinglong). 0.60-m

Schmidt. Measurer J. Zhu.

Parabolic orbital elements from 10 observations Feb. 17–20 (mean of Feb. 17 trail ends on IAUC 6562, beginning of Feb. 19 trail):

T = 1997 Oct. 9.527 TT  ω = 179.^{o}982
Ω = 277.822 }2000.0
q = 2.37528 AU  i = 142.148
1997 TT α_{2000}  δ_{2000}  Δ  r  ϵ  β  m_{1}
Feb. 11 13^{h}02.^{m}48 +43^{o}58.^{′}7 2.816 3.506 127.^{o}5 12.^{o}9 15.2
16 12 51.84 +45 51.0 2.746 3.469 130.4 12.5 15.1
21 12 39.29 +47 40.9 2.686 3.432 132.5 12.3 15.0
26 12 24.74 +49 24.7 2.637 3.396 133.5 12.2 14.9
Mar. 3 12 08.22 +50 58.4 2.601 3.360 133.4 12.4 14.8
8 11 49.87 +52 18.1 2.576 3.324 132.1 12.8 14.8
13 11 30.08 +53 20.2 2.564 3.289 129.6 13.5 14.7
18 11 09.38 +54 02.1 2.564 3.253 126.3 14.3 14.7
23 10 48.45 +54 22.8 2.575 3.219 122.2 15.2 14.6
28 10 27.99 +54 22.6 2.596 3.184 117.6 16.1 14.6
Apr. 2 10 08.63 +54 03.3 2.627 3.150 112.6 17.0 14.6
7 9 50.83 +53 27.6 2.667 3.116 107.4 17.9 14.6
12 9 34.90 +52 38.8 2.713 3.083 102.1 18.5 14.6
1997 February 20  \begin{matrix}c \\ ◯ \end{matrix} Copyright 1997 CBAT  Brian G. Marsden