MPEC 2002-C91 : 1998 FW4
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M.P.E.C. 2002-C91 Issued 2002 Feb. 13, 19:25 UT
The Minor Planet Electronic Circulars contain information on unusual
minor planets and routine data on comets. They are published
on behalf of Commission 20 of the International Astronomical Union by the
Minor Planet Center, Smithsonian Astrophysical Observatory,
Cambridge, MA 02138, U.S.A.
Prepared using the Tamkin Foundation Computer Network
MPC@CFA.HARVARD.EDU
URL http://cfa-www.harvard.edu/iau/mpc.html ISSN 1523-6714
1998 FW4
Revision to MPEC 1998-F18
Observations:
J98F04W C2002 02 12.52845 14 51 16.11 -15 13 37.1 20.9 V 291
J98F04W C2002 02 12.53566 14 51 15.72 -15 13 36.9 21.7 V 291
J98F04W C2002 02 12.54067 14 51 15.41 -15 13 37.7 21.2 V 291
J98F04W C2002 02 13.51888 14 50 23.70 -15 14 20.4 21.4 V 291
J98F04W C2002 02 13.52613 14 50 23.26 -15 14 20.9 21.6 V 291
J98F04W C2002 02 13.53411 14 50 22.78 -15 14 21.0 21.2 V 291
Observer details:
291 LPL/Spacewatch II. Observers R. S. McMillan, J. A. Larsen. 1.8-m
Spacewatch telescope.
First and last observations above in comparison with prediction:
Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
020212 291 0.03- 0.16- 020213 291 0.00- 0.16- MPC 32062 -1.5 day
Orbital elements:
1998 FW4 PHA 0.001
Epoch 2001 Oct. 18.0 TT = JDT 2452200.5 MPC
M 347.02275 (2000.0) P Q
n 0.25011995 Peri. 75.37936 +0.19934935 -0.97992262
a 2.4948082 Node 3.12769 +0.87344524 +0.17611703
e 0.7288595 Incl. 3.56396 +0.44424459 +0.09345833
P 3.94 H 19.7 G 0.15 U 3
Residuals in seconds of arc
980320 704 0.7+ 0.4- 980324 673 1.5+ 0.0 980330 046 0.2- 0.1+
980320 704 0.8- 0.8+ 980324 673 1.2+ 0.7- 980330 046 0.1- 0.4+
980320 704 (2.1+ 2.0+) 980326 046 0.4+ 0.2- 980331 557 0.5+ 0.5-
980320 704 1.3- 0.1- 980326 046 0.2- 0.0 980331 557 0.8- 0.7-
980322 704 0.2- 1.6- 980326 046 0.5- 0.5+ 980529 568 0.5+ 0.4+
980322 704 1.3+ 0.5+ 980328 704 (0.2+ 2.4-) 980529 568 0.2+ 0.2+
980322 704 1.0+ 0.0 980328 704 (2.3- 1.2+) 980531 568 0.2+ 0.4+
980323 557 0.4+ 0.1+ 980328 704 0.8- 0.5+ 980531 568 0.1- 0.2+
980323 557 0.1- 0.2+ 980328 704 (3.0- 3.0-) 020212 291 0.1- 0.3-
980323 046 0.1+ 1.1+ 980329 658 1.2- 0.4- 020212 291 0.1+ 0.2+
980323 046 1.0+ 0.7+ 980329 658 0.3- 0.6- 020212 291 0.2- 0.3-
980323 046 0.0 0.9+ 980329 658 1.7- 0.8- 020213 291 0.1+ 0.2+
980323 046 (2.4+ 1.4+) 980329 046 0.1+ 1.5- 020213 291 0.0 0.0
980323 046 1.0- 1.4+ 980330 046 0.3+ 0.7- 020213 291 0.0 0.2+
Ephemeris:
1998 FW4 a,e,i = 2.49, 0.73, 4 q = 0.6764
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2002 02 05 14 56.35 -15 00.0 0.623 1.166 89.9 57.8 21.1
2002 02 15 14 48.99 -15 14.8 0.640 1.281 101.7 49.0 21.1
2002 02 25 14 36.41 -15 02.6 0.653 1.395 114.7 40.1 21.1
2002 03 07 14 18.57 -14 19.8 0.670 1.507 129.1 30.7 21.0
2002 03 17 13 56.76 -13 06.5 0.699 1.616 144.4 21.0 21.0
2002 03 27 13 33.63 -11 31.3 0.750 1.722 160.2 11.3 21.0
2002 04 06 13 12.22 -09 50.3 0.825 1.824 175.2 2.7 20.9
2002 04 16 12 54.72 -08 19.1 0.928 1.924 169.8 5.3 21.4
2002 04 26 12 42.13 -07 08.6 1.056 2.020 156.8 11.3 22.0
Brian G. Marsden (C) Copyright 2002 MPC M.P.E.C. 2002-C91
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