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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