MPEC 2012-U114: 1998 WL4
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M.P.E.C. 2012-U114 Issued 2012 Oct. 27, 20:22 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 https://www.minorplanetcenter.net/ ISSN 1523-6714
1998 WL4
Revision to MPEC 1998-W27
Additional Observations:
J98W04L C2012 10 25.26245 01 07 14.30 +33 27 33.1 19.0 VrEU114703
J98W04L C2012 10 25.26858 01 07 13.65 +33 27 00.2 18.9 VrEU114703
J98W04L C2012 10 25.27468 01 07 13.04 +33 26 25.0 18.8 VrEU114703
J98W04L C2012 10 25.28077 01 07 12.43 +33 25 50.8 19.5 VrEU114703
J98W04L KC2012 10 25.30815401 07 09.15 +33 23 13.2 18.8 VrEU114H21
J98W04L KC2012 10 25.31467501 07 08.51 +33 22 36.6 18.7 VrEU114H21
J98W04L KC2012 10 25.32044301 07 07.94 +33 22 04.3 18.9 VrEU114H21
J98W04L C2012 10 25.32094 01 07 08.31 +33 22 06.1 18.8 VrEU114703
J98W04L C2012 10 25.32191 01 07 08.15 +33 22 01.3 19.6 VrEU114703
J98W04L C2012 10 25.32290 01 07 08.34 +33 21 54.1 17.9 VrEU114703
J98W04L C2012 10 25.32392 01 07 07.97 +33 21 50.8 18.8 VrEU114703
J98W04L KC2012 10 25.84423 01 06 22.35 +32 34 06.8 19.3 VoEU114198
J98W04L KC2012 10 25.84998 01 06 21.86 +32 33 35.3 19.3 VoEU114198
J98W04L KC2012 10 25.85380 01 06 21.53 +32 33 15.3 19.1 VoEU114198
J98W04L KC2012 10 25.85476 01 06 21.39 +32 33 10.0 19.3 VoEU114198
J98W04L SC2012 10 26.07083 01 06 01.39 +32 13 54.3 19.3 VuEU114954
J98W04L SC2012 10 26.10679 01 05 58.02 +32 10 41.1 18.8 VuEU114954
J98W04L SC2012 10 26.12089 01 05 57.11 +32 09 21.9 19.1 VuEU114954
J98W04L KC2012 10 27.14420 01 04 36.64 +30 40 38.3 18.3 RuEU114H36
J98W04L KC2012 10 27.16461 01 04 35.04 +30 38 53.2 19.4 RuEU114H36
J98W04L KC2012 10 27.17484 01 04 34.27 +30 38 04.2 19.1 RuEU114H36
Observer details:
198 Wildberg. Observer R. Apitzsch. 0.35-m f/4.2 reflector + CCD.
703 Catalina Sky Survey. Observer R. A. Kowalski. Measurers A. Boattini,
E. J. Christensen, A. R. Gibbs, A. D. Grauer, R. E. Hill, R. A. Kowalski,
S. M. Larson, R. H. McNaught. 0.68-m Schmidt + CCD.
954 Teide Observatory. Observer N. D. Diaz. 0.26-m f/11.6 reflector + CCD.
H21 Astronomical Research Observatory, Westfield. Observer R. Holmes.
Measurers L. Buzzi, H. Devore, S. Foglia, T. Vorobjov. 0.61-m f/4.0
astrograph + CCD.
H36 Sandlot Observatory, Scranton. Observer G. Hug. 0.56-m reflector + CCD.
First and last observations above in comparison with prediction:
Residuals in seconds of arc (or integer in degrees), reference and Delta-T
121025 703 41- 15+ 121027 H36 42- 13+ MPO 57681 +65 day
Orbital elements:
1998 WL4 Earth MOID = 0.2190 AU
Epoch 2012 Sept. 30.0 TT = JDT 2456200.5 MPC
M 20.52739 (2000.0) P Q
n 0.42033587 Peri. 41.48019 -0.08107979 +0.95308056
a 1.7649744 Node 226.20920 -0.98733310 -0.11684085
e 0.7333985 Incl. 23.83025 -0.13637965 +0.27925914
P 2.34 H 19.5 G 0.15 U 5
Residuals in seconds of arc
981116 691 0.0 0.5- 981126 691 0.3+ 0.1+ 121025 703 (3.3+ 1.6-)
981116 691 0.3+ 0.1- 981126 691 0.0 0.5- 121025 703 0.1- 0.8+
981116 691 0.2- 0.3- 981126 691 0.3- 0.1- 121025 198 0.6- 0.0
981117 691 0.7- 0.0 121025 703 0.1+ 0.3- 121025 198 0.1+ 0.5-
981117 691 0.3+ 0.1- 121025 703 0.1- 1.1+ 121025 198 0.4+ 0.1+
981117 691 0.2- 0.8- 121025 703 0.2+ 0.1- 121025 198 0.2- 0.1-
981119 691 1.1- 0.9+ 121025 703 0.4+ 0.3- 121026 954 1.5- 0.0
981119 691 0.1+ 0.3+ 121025 H21 0.4+ 0.1- 121026 954 1.7- 0.6+
981119 691 0.4+ 0.1+ 121025 H21 0.5+ 0.2- 121026 954 (3.3+ 2.6-)
981122 691 0.1+ 0.2+ 121025 H21 0.5+ 0.1- 121027 H36 0.7- 0.5+
981122 691 0.5+ 0.4+ 121025 703 0.4+ 0.6- 121027 H36 0.6+ 1.7-
981122 691 0.4+ 0.4+ 121025 703 0.4- 0.1+ 121027 H36 1.7+ 1.0+
Ephemeris:
1998 WL4 a,e,i = 1.76, 0.73, 24 q = 0.4705
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2012 09 27 09 53 53.0 +72 32 08 0.2815 0.9803 77.4 86.3 19.7
...
2012 10 12 01 59 30.1 +60 50 45 0.2718 1.1777 125.7 43.5 18.7
...
2012 10 20 01 18 26.3 +42 44 24 0.3203 1.2770 147.3 24.9 18.7
...
2012 10 26 01 06 08.4 +32 20 18 0.3780 1.3488 156.3 17.2 18.9
2012 10 27 01 04 47.2 +30 52 59 0.3891 1.3605 157.0 16.6 19.0
2012 10 28 01 03 34.6 +29 30 05 0.4005 1.3722 157.5 16.1 19.1
...
2012 11 03 00 58 42.2 +22 35 15 0.4761 1.4409 156.4 16.0 19.6
...
2012 11 11 00 56 31.7 +16 14 50 0.5922 1.5290 149.2 19.4 20.3
...
2012 11 26 01 00 07.4 +09 45 48 0.8447 1.6842 133.6 25.1 21.4
A. U. Tomatic (C) Copyright 2012 MPC M.P.E.C. 2012-U114
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