MPEC 1999-R38: 1998 XB
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M.P.E.C. 1999-R38 Issued 1999 Sept. 12, 16:51 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.
BMARSDEN@CFA.HARVARD.EDU or GWILLIAMS@CFA.HARVARD.EDU
URL http://cfa-www.harvard.edu/iau/mpc.html ISSN 1523-6714
1998 XB
Revision to MPEC 1998-X20
Observations:
J98X00B C1999 09 11.12034 08 15 16.23 +21 14 46.6 18.4 R 046
J98X00B C1999 09 11.12265 08 15 16.71 +21 14 46.3 046
J98X00B C1999 09 11.12377 08 15 16.93 +21 14 46.0 046
J98X00B C1999 09 11.12493 08 15 17.17 +21 14 45.4 046
J98X00B C1999 09 11.13003 08 15 18.13 +21 14 44.1 046
J98X00B C1999 09 11.13120 08 15 18.37 +21 14 44.5 046
J98X00B C1999 09 12.11297 08 18 19.13 +21 11 36.6 046
J98X00B C1999 09 12.11416 08 18 19.36 +21 11 37.1 046
J98X00B C1999 09 12.11530 08 18 19.52 +21 11 36.8 046
J98X00B C1999 09 12.11782 08 18 19.97 +21 11 35.5 17.8 R 046
J98X00B C1999 09 12.12422 08 18 21.17 +21 11 34.6 046
J98X00B C1999 09 12.12537 08 18 21.37 +21 11 34.4 046
Observer details:
046 Klet. Observers J. Ticha, M. Tichy. Measurer M. Tichy. 0.57-m f/6.2
reflector + CCD.
First and last observations above in comparison with prediction:
Residuals in seconds of arc, reference and Delta-T
990911 046 0.7+ 1.0+ 990912 046 1.7+ 0.5+ MPC 34311 +0.00066 day
Orbital elements:
1998 XB
Epoch 1999 Aug. 10.0 TT = JDT 2451400.5 Marsden
M 115.63454 (2000.0) P Q
n 1.13954985 Peri. 202.58078 +0.13644802 +0.96406051
a 0.9077798 Node 75.86558 -0.86921283 +0.22690323
e 0.3511815 Incl. 13.59662 -0.47523782 -0.13821090
P 0.86 H 15.5 G 0.15 U 4
Residuals in seconds of arc
981125 704 0.0 0.6- 981216 557 0.6- 0.4+ 981228 402 0.8+ 0.0
981125 704 1.1- 0.9+ 981216 557 0.7- 0.3+ 981228 402 0.4+ 0.1+
981125 704 1.0+ 0.8- 981216 557 0.6- 0.4+ 990102 046 0.5- 1.7+
981125 704 0.7- 0.4- 981216 557 0.5- 0.3+ 990102 046 0.7- 0.9+
981201 327 0.3+ 0.0 981216 360 0.1- 0.5- 990102 046 0.0 0.5+
981201 327 0.2+ 0.0 981216 360 0.1+ 0.4- 990102 046 1.1- 0.1+
981201 327 0.3+ 0.2+ 981216 360 0.0 0.4- 990106 557 0.5- 1.4-
981202 327 0.4+ 0.4+ 981217 557 0.4+ 0.8- 990106 557 0.4- 1.4-
981202 327 0.3+ 0.1+ 981217 557 0.3- 0.9- 990106 557 0.5- 1.5-
981202 327 0.2+ 0.1+ 981217 557 0.0 0.5- 990106 557 0.7- 1.4-
981202 327 0.0 0.1+ 981217 046 0.6+ 0.2- 990109 327 1.2+ 0.9+
981202 327 0.1- 0.2+ 981217 046 0.6+ 0.1- 990109 327 0.3- 0.5+
981202 327 0.0 0.3+ 981217 046 0.7+ 0.1- 990109 327 0.1- 0.0
981203 758 0.2+ 0.1+ 981217 327 0.4+ 0.3+ 990117 402 0.2- 0.1+
981203 758 0.7+ 0.8+ 981217 327 0.4+ 0.2+ 990117 402 0.0 0.1+
981203 758 0.5+ 0.8+ 981217 327 0.2+ 0.2+ 990117 402 0.0 0.1+
981203 758 0.5+ 0.9+ 981217 327 0.3+ 0.2+ 990118 327 0.0 0.0
981203 758 0.7- 0.1- 981217 327 0.3+ 0.4+ 990118 327 0.1- 0.0
981204 046 0.2+ 0.4+ 981217 327 0.1- 0.3+ 990118 327 0.0 0.1-
981204 046 0.2- 0.8+ 981217 327 0.1+ 0.0 990119 046 0.3- 0.6+
981204 046 0.7- 0.9+ 981217 327 0.1+ 0.2- 990119 046 0.3- 0.5+
981204 046 0.3- 0.5+ 981217 327 0.2+ 0.2+ 990119 046 0.4- 0.4+
981204 097 0.3- 0.1+ 981217 327 0.3+ 0.2- 990119 104 0.2- 0.0
981204 097 0.1- 0.4+ 981217 327 0.5- 0.3+ 990119 104 0.1+ 0.1-
981204 758 0.1+ 0.5+ 981217 327 0.3+ 0.4+ 990119 104 0.1- 0.4-
981204 758 0.0 0.5+ 981218 327 0.5+ 0.1- 990121 327 0.5+ 0.5-
981204 758 0.9- 0.6+ 981218 327 0.4+ 0.0 990121 327 0.4+ 0.5-
981204 758 0.9- 0.9+ 981218 327 0.6+ 0.0 990121 327 0.4+ 0.4-
981204 758 0.2- 0.5+ 981218 402 0.3+ 0.4- 990121 327 0.6+ 0.5-
981204 713 0.6- 0.0 981218 402 0.6+ 0.3- 990121 587 0.4+ 0.7-
981204 713 0.3- 0.3- 981218 402 0.4+ 0.2- 990121 587 0.3+ 0.8-
981204 713 1.0- 0.2- 981221 327 0.1- 0.0 990125 711 0.0 0.7-
981204 713 0.1- 0.9- 981221 327 0.5+ 0.1+ 990125 711 0.1+ 0.7-
981204 327 0.2+ 0.1+ 981221 327 (2.8+ 0.9+) 990205 355 1.6+ 0.2-
981204 327 0.3+ 0.1- 981224 121 0.1- 0.3- 990205 355 0.9+ 0.6-
981204 327 0.4+ 0.4- 981224 121 0.0 0.5- 990205 355 1.0+ 0.0
981204 327 0.6+ 0.4- 981224 121 0.0 0.6- 990209 118 0.5+ 0.5-
981204 327 0.4+ 0.0 981224 360 0.3- 0.4- 990209 118 0.4+ 0.5-
981204 327 0.1+ 0.1- 981224 360 0.1- 0.5- 990215 292 0.1+ 1.8+
981205 097 0.5- 0.2- 981224 360 0.4- 0.4- 990215 292 0.7- 0.6+
981205 097 0.5- 0.1- 981224 327 0.1+ 0.4- 990215 292 0.6- 0.6+
981205 900 1.6- 0.9- 981224 327 0.1+ 0.4- 990216 118 0.1- 0.0
981205 900 0.5- 1.0- 981224 327 0.1- 0.3- 990216 118 0.1- 0.1+
981206 104 1.2+ 0.3+ 981225 327 0.3- 0.1- 990216 118 0.2- 0.1+
981206 104 0.3- 0.8- 981225 327 0.4+ 0.0 990228 151 0.8+ 0.4+
981206 104 0.2- 0.4- 981225 327 0.1+ 0.1+ 990228 151 0.2- 1.5+
981206 327 0.7+ 0.1+ 981225 327 0.3- 0.1- 990228 151 (4.3- 4.0+)
981206 327 0.0 0.2+ 981226 151 0.9- 0.6- 990911 046 1.2- 0.7+
981206 327 0.7+ 0.3+ 981226 151 1.1- 0.0 990911 046 0.4- 0.8+
981208 327 0.4- 0.1- 981226 151 0.2+ 0.9+ 990911 046 0.2- 0.7+
981208 327 0.8- 0.6+ 981226 151 0.3+ 0.2- 990911 046 0.2+ 0.3+
981209 327 0.8+ 0.6- 981226 327 0.1+ 0.3- 990911 046 0.5+ 0.1-
981209 327 0.3+ 0.3- 981226 327 0.1+ 0.0 990911 046 0.8+ 0.5+
981209 327 0.9+ 0.5+ 981226 327 0.1+ 0.0 990912 046 0.3+ 0.1+
981211 355 0.7- 0.1- 981226 327 0.1+ 0.0 990912 046 0.5+ 0.8+
981211 355 0.5+ 0.0 981226 327 0.0 0.1- 990912 046 0.2- 0.7+
981211 355 1.3- 0.1+ 981227 402 0.0 0.1- 990912 046 0.4- 0.1-
981214 327 0.9- 1.6+ 981227 402 0.0 0.2- 990912 046 0.0 0.2+
981214 327 0.0 0.5+ 981227 402 0.1- 0.3- 990912 046 0.2- 0.2+
981214 327 0.4- 0.6+ 981228 402 0.4+ 0.1+
Ephemeris:
1998 XB a,e,i = 0.91, 0.35, 14 q = 0.5890
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
1999 09 09 08 08.75 +21 21.0 1.656 1.202 46.2 37.2 18.5
1999 09 19 08 39.43 +20 45.1 1.615 1.217 48.8 38.4 18.5
1999 09 29 09 10.12 +19 52.2 1.565 1.225 51.5 39.8 18.5
1999 10 09 09 41.02 +18 43.0 1.508 1.226 54.1 41.3 18.5
1999 10 19 10 12.35 +17 17.9 1.443 1.220 56.5 42.9 18.4
1999 10 29 10 44.38 +15 36.8 1.374 1.207 58.7 44.7 18.3
1999 11 08 11 17.45 +13 39.1 1.302 1.188 60.6 46.6 18.2
1999 11 18 11 51.94 +11 23.8 1.228 1.161 62.1 48.8 18.1
1999 11 28 12 28.32 +08 49.5 1.157 1.128 62.9 51.2 18.0
1999 12 08 13 07.12 +05 54.3 1.090 1.087 63.0 53.8 17.8
1999 12 18 13 48.86 +02 37.6 1.031 1.040 62.1 56.7 17.7
1999 12 28 14 34.11 -00 59.8 0.983 0.987 60.2 59.9 17.6
2000 01 07 15 23.34 -04 52.6 0.951 0.927 57.3 63.1 17.5
2000 01 17 16 16.73 -08 48.8 0.938 0.863 53.3 66.1 17.4
2000 01 27 17 14.17 -12 29.3 0.949 0.796 48.6 68.1 17.3
2000 02 06 18 15.12 -15 28.8 0.985 0.729 43.4 68.3 17.2
2000 02 16 19 18.53 -17 20.7 1.049 0.667 38.1 66.0 17.1
2000 02 26 20 22.95 -17 42.9 1.137 0.619 32.9 60.4 16.9
Brian G. Marsden (C) Copyright 1999 MPC M.P.E.C. 1999-R38
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