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    • MPEC 2003-A55 : 2001 QR322

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    M.P.E.C. 2003-A55                                Issued 2003 Jan. 8, 21:10 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

                                  2001 QR322

                           Revision to MPEC 2001-V11

Additional Observations:
     K01QW2R  C2002 11 07.13563 23 55 03.99 -01 13 50.8          22.2 R      695
     K01QW2R  C2002 11 07.22529 23 55 03.62 -01 13 53.4                      695
     K01QW2R  C2002 12 23.20589 23 54 11.45 -01 18 54.4          22.8 R      568
     K01QW2R  C2002 12 23.28621 23 54 11.59 -01 18 53.3                      568

Observer details:
568 Mauna Kea.  Observer J. A. Pittichova.  Measurer K. J. Meech.  2.2-m
    University of Hawaii reflector + CCD.
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,
    K. B. Clancy, D. E. Trilling, L. E. Hutchison.  4-m telescope + CCD.

First and last observations above in comparison with prediction:
Residuals in seconds of arc (or two decimals in degrees) and reference
021107 695 0.21- 0.09-    021223 568 0.22- 0.09-    MPO 23684

Orbital elements:
2001 QR322
Epoch 2002 Nov. 22.0 TT = JDT 2452600.5                 MPC
M 324.31307              (2000.0)            P               Q
n   0.00594862     Peri.  245.42714     +0.79754760     -0.60315625
a  30.1665337      Node   151.66535     +0.56150210     +0.73557518
e   0.0225906      Incl.    1.32447     +0.22052939     +0.30843426
P 165.69           H    7.0           G   0.15           U   6
Residuals in seconds of arc
010821 807  0.2-  0.3+    011021 695  0.0   0.2-    021107 695  0.4-  0.3+
010821 807  0.0   0.3+    011103 304  0.2-  0.0     021223 568  0.2+  0.5-
011020 695  0.6+  0.3-    011103 304  0.1-  0.1-    021223 568  0.3+  0.4-
011020 695  0.3+  0.2-    021107 695  0.1-  0.7+

Ephemeris:
2001 QR322               a,e,i = 30.17, 0.02, 1                  q = 29.485
Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
2003 01 01    23 54.53   -01 16.6   29.803   29.617    78.1     1.9    22.0
2003 01 11    23 55.11   -01 12.7   29.969   29.616    68.1     1.8    22.0
2003 01 21    23 55.87   -01 07.5   30.124   29.616    58.1     1.6    22.0
2003 01 31    23 56.82   -01 01.3   30.263   29.615    48.2     1.4    22.0
2003 02 10    23 57.91   -00 54.1   30.382   29.615    38.4     1.2    21.9

     According to the above orbit, the 1:1 Neptune librator remains more than
20 AU from Neptune over a 14 000-year period.  E. Chiang has confirmed the
object's status as the first known "Neptune Trojan" by integrating the orbit
over 10^9 years.

Brian G. Marsden             (C) Copyright 2003 MPC           M.P.E.C. 2003-A55

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