MPEC 2003-U56 : 2003 UC20 = 1954 XA
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M.P.E.C. 2003-U56 Issued 2003 Oct. 23, 20:16 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.
Supported in part by the Steven and Michele Kirsch Foundation
Prepared using the Tamkin Foundation Computer Network
MPC@CFA.HARVARD.EDU
URL http://cfa-www.harvard.edu/iau/mpc.html ISSN 1523-6714
2003 UC20 = 1954 XA
Revision to MPEC 2003-U55
Additional Observations:
K03U20C C2003 10 23.45104 08 37 21.26 +06 32 18.0 17.7 704
K03U20C C2003 10 23.46330 08 37 19.74 +06 31 59.8 17.9 704
K03U20C C2003 10 23.47577 08 37 18.20 +06 31 40.9 17.9 704
K03U20C C2003 10 23.48821 08 37 16.61 +06 31 22.5 17.8 704
Observer details:
704 Lincoln Laboratory ETS, New Mexico. Observers M. Blythe, F. Shelly,
M. Bezpalko, R. Huber, L. Manguso, D. Torres, R. Kracke, M. McCleary,
H. Stange. Measurers J. Stuart, R. Sayer, J. Evans, J. Kommers. 1.0-m
f/2.15 reflector + CCD.
Orbital elements:
2003 UC20 = 1954 XA
Epoch 2003 Dec. 27.0 TT = JDT 2453000.5 MPC
M 218.46897 (2000.0) P Q
n 1.42796046 Peri. 59.19555 -0.37252920 +0.92796344
a 0.7810136 Node 188.95082 -0.87243912 -0.35397520
e 0.3369552 Incl. 3.79162 -0.31634156 -0.11655649
P 0.69 H 19.2 G 0.15 U 1
Residuals in seconds of arc
541205 675 0.1+ 0.3+ 031022 704 0.4+ 0.0 031022 673 0.1+ 0.1+
541205 675 0.1- 0.4+ 031022 704 0.3- 0.2- 031022 673 0.1+ 0.0
541205 675 0.6+ 0.3+ 031022 704 0.3- 0.0 031022 673 0.0 0.0
541211 675(12.1- 7.3-) 031022 704 0.2+ 0.0 031022 673 0.0 0.2+
541211 675 0.5- 1.1- 031022 704 0.4- 0.4- 031023 704 0.0 0.3+
031021 704 0.2- 0.3- 031022 704 0.3+ 0.0 031023 704 0.0 0.4+
031021 704 0.0 0.8- 031022 926 0.3+ 0.2+ 031023 673 0.2+ 0.3+
031021 704 0.2- 0.8- 031022 926 0.1- 0.1- 031023 673 0.6+ 0.8+
031021 704 0.0 0.9- 031022 926 0.5- 0.3- 031023 673 0.7+ 0.2+
031022 704 0.3- 0.4+ 031022 704 0.0 0.2+ 031023 704 0.2+ 0.2+
031022 704 0.1+ 0.3- 031022 673 0.1+ 0.2+ 031023 704 0.1- 0.5+
031022 704 0.2+ 0.3+ 031022 673 0.7- 0.4-
Ephemeris:
2003 UC20 a,e,i = 0.78, 0.34, 4 q = 0.5178
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2003 10 18 08 46.95 +08 38.7 0.171 0.959 72.6 97.6 18.8
2003 10 28 08 28.60 +04 28.9 0.148 0.994 85.9 85.6 18.0
2003 11 07 08 03.34 -01 20.0 0.123 1.020 100.0 73.2 17.3
2003 11 17 07 20.25 -09 33.5 0.100 1.036 115.9 59.1 16.4
2003 11 27 06 03.19 -19 47.9 0.084 1.044 130.6 45.9 15.7
2003 12 07 04 15.36 -26 38.6 0.085 1.042 130.0 46.4 15.7
2003 12 17 02 43.65 -26 24.1 0.101 1.031 115.1 59.8 16.4
2003 12 27 01 48.67 -23 08.9 0.125 1.011 99.2 73.8 17.3
2004 01 06 01 16.78 -19 53.0 0.149 0.982 85.1 86.2 18.1
2004 01 16 00 53.99 -17 19.3 0.171 0.944 71.6 98.5 18.8
The linked orbit above is based upon a successful linkage of the
1954 and 2003 observations by A. Lowe. Lowe's solution fitted both
1954 Nov. 11 observations with residuals of +/- 6". These observations
have long been known to be problematic. The above solution includes one
of these observations, further observations at the current apparition
will show whether this choice was justified.
Gareth V. Williams (C) Copyright 2003 MPC M.P.E.C. 2003-U56
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