Central Bureau for Astronomical Telegrams
IAUC 6988: C/1998 P1
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Circular No. 6988
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/iau/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)
COMET C/1998 P1 (WILLIAMS)
The following precise CCD positions have been reported:
1998 UT R.A. (2000) Decl. m1 Observer
Aug. 11.43374 15 01 41.90 -63 50 25.5 13.8 Lee
11.44783 15 01 34.38 -63 49 24.7 16.0 "
11.44887 15 01 33.81 -63 49 20.6 13.5 "
11.44962 15 01 33.42 -63 49 17.9 13.5 "
11.46033 15 01 27.66 -63 48 31.4 13.5 "
11.46241 15 01 26.50 -63 48 22.4 13.3 "
12.00766 14 56 46.01 -63 09 46.9 Mendez
12.01497 14 56 42.29 -63 09 15.9 "
12.03809 14 56 30.78 -63 07 37.1 "
12.04598 14 56 26.71 -63 07 03.0 "
12.06699 14 56 16.20 -63 05 33.0 "
12.37075 14 53 49.76 -62 44 09.7 13.6 Lee
12.37214 14 53 49.12 -62 44 03.8 13.5 "
12.40512 14 53 33.27 -62 41 43.9 13.3 "
12.40616 14 53 32.80 -62 41 39.1 13.4 "
S. Lee (Rainbow Observatory, nr. Coonabarabran). 0.20-m f/4.5 reflector.
O. Mendez and J. Scheck (Los Molinos). 0.35-m f/6.4 reflector.
Parabolic orbital elements from 25 observations Aug. 11-12:
T = 1998 Oct. 16.95 TT Peri. = 292.81
Node = 156.09 2000.0
q = 1.1623 AU Incl. = 145.62
1998 TT R. A. (2000) Decl. Delta r Elong. Phase m1
Aug. 10 15 15.71 -65 31.9 0.977 1.568 103.9 38.9 9.4
15 14 35.94 -59 42.0 1.053 1.520 94.7 41.6 9.4
20 14 13.45 -54 23.7 1.142 1.473 86.0 43.3 9.5
25 13 59.76 -49 50.7 1.239 1.428 78.1 43.9 9.5
30 13 50.91 -46 00.8 1.339 1.385 70.7 43.5 9.5
Sept. 4 13 44.94 -42 47.5 1.440 1.345 63.8 42.3 9.6
9 13 40.79 -40 04.0 1.539 1.308 57.4 40.4 9.6
14 13 37.81 -37 44.3 1.634 1.274 51.2 38.0 9.6
19 13 35.64 -35 43.4 1.723 1.244 45.4 35.1 9.6
24 13 34.02 -33 57.6 1.805 1.218 39.9 31.9 9.6
29 13 32.77 -32 23.5 1.879 1.197 34.6 28.3 9.7
Oct. 4 13 31.78 -30 58.7 1.943 1.181 29.5 24.7 9.7
(C) Copyright 1998 CBAT
1998 August 12 (6988) Brian G. Marsden
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