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    • MPEC 2003-Y52 : 2001 UN18

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    M.P.E.C. 2003-Y52                                Issued 2003 Dec. 23, 19:52 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

                                   2001 UN18

                           Revision to MPEC 2001-V13

Additional Observations:
     K01U18N  C2002 11 07.13992 01 12 22.56 +07 27 51.6          22.8 R EY052695
     K01U18N  C2002 11 07.24749 01 12 22.14 +07 27 49.2                 EY052695
     K01U18N  C2003 10 23.15737 01 17 30.12 +08 03 14.7          22.5 R EY052695
     K01U18N  C2003 10 23.25280 01 17 29.73 +08 03 12.4                 EY052695

Observer details:
695 Kitt Peak.  Observers L. H. Wasserman, D. E. Trilling, R. L. Millis.
    Measurers M. W. Buie, S. D. Kern, R. L. Millis, L. H. Wasserman, E. I.
    Chiang, S. N. Hylton, K. B. Clancy, D. E. Trilling, L. E. Hutchinson,
    J. R. Lovering.  4-m reflector + CCD.

First and last observations above in comparison with prediction:
Residuals in seconds of arc (or two decimals in degrees) and reference
021107 695 0.04- 0.00-    031023 695 0.08- 0.01-    MPO 21109

Orbital elements:
2001 UN18
Epoch 2003 Dec. 27.0 TT = JDT 2453000.5                 MPC
M 129.61607              (2000.0)            P               Q
n   0.00336220     Peri.  222.30526     -0.41862204     +0.90782650
a  44.1286367      Node    22.98014     -0.81541904     -0.36379440
e   0.0770410      Incl.    3.61702     -0.39980917     -0.20857777
P 293              H    6.4           G   0.15           U   6
Residuals in seconds of arc
011019 695  0.2-  0.1+    021107 695  0.1+  0.0     031023 695  0.1+  0.0
011019 695  0.2+  0.1-    021107 695  0.1-  0.0
011020 695  0.0   0.0     031023 695  0.1-  0.0

Ephemeris:
2001 UN18                a,e,i = 44.13, 0.08, 4                  q = 40.729
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
2003 12 17    01 14.67   +07 47.0   46.006   46.439   115.6     1.1    23.2
2003 12 27    01 14.50   +07 46.1   46.170   46.441   105.4     1.2    23.2
2004 01 06    01 14.47   +07 46.0   46.343   46.442    95.2     1.2    23.2
2004 01 16    01 14.58   +07 46.8   46.519   46.444    85.0     1.2    23.2
2004 01 26    01 14.82   +07 48.5   46.692   46.445    74.9     1.2    23.3
2004 02 05    01 15.20   +07 50.9   46.857   46.446    64.9     1.1    23.3
2004 02 15    01 15.70   +07 54.1   47.009   46.448    54.9     1.0    23.2
2004 02 25    01 16.31   +07 57.9   47.144   46.449    44.9     0.9    23.2
2004 03 06    01 17.01   +08 02.3   47.259   46.450    35.1     0.7    23.2

Brian G. Marsden             (C) Copyright 2003 MPC           M.P.E.C. 2003-Y52

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