MPEC 2002-A74: 1998 XN2
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M.P.E.C. 2002-A74 Issued 2002 Jan. 13, 00:08 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 XN2
Revision to MPEC 1998-X32
Observations:
J98X02N C2002 01 11.40735 10 33 28.09 +06 03 54.8 22.2 V 291
J98X02N C2002 01 11.41461 10 33 27.48 +06 03 56.6 22.3 V 291
J98X02N C2002 01 11.42185 10 33 27.05 +06 03 58.9 22.1 V 291
J98X02N C2002 01 12.43125 10 32 23.52 +06 08 29.2 21.4 V 291
J98X02N C2002 01 12.43963 10 32 22.90 +06 08 32.2 21.8 V 291
J98X02N C2002 01 12.44608 10 32 22.47 +06 08 34.0 21.6 V 291
Observer details:
291 LPL/Spacewatch II. Observers J. A. Larsen, R. S. McMillan. 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
020111 291 0.10+ 0.04- 020112 291 0.10+ 0.04- MPC 34031 -0.21 day
Orbital elements:
1998 XN2 PHA 0.007
Epoch 2001 Oct. 18.0 TT = JDT 2452200.5 MPC
M 17.56599 (2000.0) P Q
n 0.34867233 Peri. 125.78164 +0.92679624 -0.37436498
a 1.9992068 Node 256.22016 +0.33384071 +0.85778527
e 0.5421241 Incl. 1.76968 +0.17204390 +0.35221484
P 2.83 H 19.6 G 0.15 U 3
Residuals in seconds of arc
981209 704 0.4- 0.8- 981211 620 0.1- 0.2- 981221 422 0.1- 0.3+
981209 704 0.1+ 0.8- 981211 620 0.9+ 0.2+ 981221 422 0.1+ 0.1-
981209 704 0.4- 0.7- 981211 620 0.1- 0.5+ 981223 691 0.2+ 0.6-
981209 704 0.7- 1.0- 981211 620 0.2+ 0.3- 981223 691 0.0 0.5-
981209 704 0.6+ 0.4- 981211 620 0.0 0.2+ 981223 670 0.9+ 0.4-
981210 704 0.4- 0.8+ 981212 836 (2.5+ 3.0+) 981223 691 1.8- 1.1-
981210 704 0.5- 0.5- 981212 836 (4.5+ 0.3-) 981223 670 1.4+ 0.3-
981210 704 0.9- 0.6- 981212 422 0.5- 0.1+ 981223 670 0.6- 0.6+
981210 704 0.9- 0.0 981212 422 0.4- 0.1- 981223 104 1.1+ 0.3+
981210 118 0.3+ 0.1+ 981212 422 0.3- 0.2- 981223 104 0.0 0.2+
981210 118 0.6+ 0.2+ 981212 402 0.2- 0.4- 981223 104 0.4+ 0.0
981210 118 0.4+ 0.1+ 981212 402 0.4- 0.5- 981223 104 1.3+ 0.3+
981210 046 0.4+ 0.1+ 981212 402 0.4+ 0.1- 981223 104 0.1- 0.2+
981210 046 1.0+ 0.4+ 981212 104 0.2- 0.0 981223 104 0.5+ 0.3+
981210 046 0.5+ 0.2+ 981212 104 0.3+ 0.4+ 981223 104 0.3+ 0.1-
981210 046 0.6+ 0.3+ 981212 104 1.0+ 0.2+ 981223 104 0.9+ 0.1-
981211 758 0.3+ 1.4+ 981212 104 0.1- 0.9+ 981223 104 0.9+ 0.4-
981211 758 1.4- 1.5+ 981214 691 0.2- 0.2- 981223 104 0.9+ 0.1+
981211 758 (0.5+ 2.5+) 981214 691 0.6- 0.3- 981223 104 0.8+ 0.2-
981211 758 0.9- 1.0+ 981214 691 0.5- 0.1- 981223 104 0.8+ 0.8-
981211 758 0.4- 0.8+ 981214 691 0.2- 0.2- 981223 104 0.9+ 0.7-
981211 758 0.3+ 1.5+ 981214 691 0.2- 0.1+ 981223 104 1.2+ 0.2-
981211 734 0.2+ 0.1- 981214 691 0.3- 0.2+ 981226 360 0.5- 0.5-
981211 734 0.8+ 0.3- 981214 658 0.4- 0.3+ 981226 360 0.5- 0.5-
981211 734 0.8+ 0.1+ 981214 658 0.3- 0.2+ 981226 360 0.3- 0.4-
981211 704 (2.0- 0.2-) 981214 658 0.2- 0.6+ 981228 046 0.2- 0.0
981211 676 (2.7- 0.7-) 981215 836 0.3+ 0.5- 981228 046 0.2+ 0.9-
981211 676 0.0 0.0 981215 836 (4.2- 3.8-) 981228 046 0.5+ 0.3-
981211 676 0.8+ 0.2- 981215 836 0.7- 0.6- 990102 658 0.2- 1.2-
981211 670 0.9+ 0.7+ 981215 691 0.0 0.2- 990102 658 0.3+ 0.8-
981211 704 0.8- 0.1+ 981215 691 0.3- 0.0 990102 658 0.4+ 1.0-
981211 676 0.7+ 0.4- 981215 691 0.5+ 0.3- 990103 658 0.2+ 0.3-
981211 676 0.7+ 0.0 981215 540 (2.8+ 0.1-) 990103 658 0.2- 0.4-
981211 676 1.1+ 0.5+ 981215 540 0.6- 0.1- 990103 658 0.7+ 0.4-
981211 670 0.7- 0.1+ 981215 540 0.4+ 0.2- 990104 422 0.4+ 0.3+
981211 704 (1.9- 2.5-) 981215 540 0.7+ 0.0 990105 402 0.2+ 0.6-
981211 670 (2.3- 1.3-) 981216 670 0.3- 0.6+ 990105 402 0.9- 0.7-
981211 670 1.6- 0.2+ 981216 670 0.9- 1.0- 990105 402 0.6+ 0.0
981211 704 1.0- 0.3- 981216 670 0.6- 0.3+ 990105 557 0.7- 0.8-
981211 422 0.3- 0.1- 981216 402 0.1- 0.4- 990105 557 0.3- 0.4-
981211 422 0.1+ 0.2- 981216 402 0.3+ 0.3- 990105 557 0.9- 0.2-
981211 422 0.0 0.2- 981216 402 0.1+ 0.3- 990124 658 0.5+ 0.2-
981211 422 0.2- 0.3- 981218 402 0.2- 0.2+ 990124 658 0.3- 0.9-
981211 355 1.2+ 0.9+ 981218 402 0.1+ 0.3+ 990124 658 0.8- 0.5-
981211 355 0.7+ 0.6+ 981218 402 0.2- 0.3+ 020111 291 2.2+ 2.0+
981211 355 0.2- 1.4+ 981219 658 1.3- 0.3- 020111 291 0.1+ 1.9+
981211 355 0.4- 1.0+ 981219 658 1.8- 0.5- 020111 291 0.7+ 2.3+
981211 426 0.4+ 0.2- 981219 658 1.7- 0.5- 020112 291 1.1+ 1.8+
981211 426 0.3- 0.0 981220 360 0.3- 0.2- 020112 291 0.3+ 2.5+
981211 426 0.1+ 0.4+ 981220 360 0.1- 0.2- 020112 291 0.4+ 2.5+
981211 426 0.2+ 0.2- 981220 360 0.3- 0.2-
Ephemeris:
1998 XN2 a,e,i = 2.00, 0.54, 2 q = 0.9154
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2002 01 06 10 38.33 +05 44.8 0.953 1.728 126.4 27.2 21.9
2002 01 16 10 28.30 +06 26.7 0.938 1.801 139.2 20.9 21.8
2002 01 26 10 14.38 +07 33.8 0.941 1.872 152.9 13.9 21.6
2002 02 05 09 58.29 +08 55.9 0.968 1.941 167.0 6.6 21.5
2002 02 15 09 42.21 +10 20.4 1.021 2.008 176.3 1.8 21.4
2002 02 25 09 28.25 +11 35.7 1.103 2.073 164.2 7.5 21.9
The fit to the 2002 observations can be improved by upweighting them
with respect to the 1998-1999 observations.
Brian G. Marsden (C) Copyright 2002 MPC M.P.E.C. 2002-A74
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