MPEC 2009-U109: First and last observations above in comparison with prediction:
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M.P.E.C. 2009-U109 Issued 2009 Oct. 27, 03:40 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://www.cfa.harvard.edu/iau/mpc.html ISSN 1523-6714
2008 NW4
Revision to MPEC 2008-R20
Additional Observations:
K08N04W C2009 05 27.43321 20 33 11.57 -09 23 01.8 EU109675
K08N04W C2009 05 29.42481 20 33 07.09 -09 22 38.7 EU109675
K08N04W C2009 07 27.20913 20 28 52.55 -09 24 14.2 21.3 R EU109688
K08N04W C2009 07 27.26532 20 28 52.24 -09 24 15.1 EU109688
Observer details:
675 Palomar Mountain. Observers M. E. Schwamb, M. E. Brown. 1.5-m f/8.5
Cassegrain + CCD.
688 Lowell Observatory, Anderson Mesa Station. Observer L. H. Wasserman.
1.8-m Perkins telescope + CCD.
First and last observations above in comparison with prediction:
Residuals in seconds of arc (or two decimals in degrees) and reference
090527 675 0.04+ 0.01+ 090727 688 0.04+ 0.01+ MPO143303
Orbital elements:
2008 NW4
Epoch 2010 Jan. 4.0 TT = JDT 2455200.5 MPC
M 345.57598 (2000.0) P Q
n 0.00320222 Peri. 46.55671 +0.82375256 +0.42153723
a 45.5863840 Node 285.09277 -0.56301869 +0.68683729
e 0.2025522 Incl. 23.12093 +0.06664595 +0.59208183
P 308 H 6.0 G 0.15 U 5
Residuals in seconds of arc
080707 675 0.1+ 0.5+ 080723 675 0.3- 0.0 080823 807 0.3+ 0.0
080707 675 0.0 0.1+ 080723 675 0.0 0.0 090527 675 0.0 0.3+
080708 675 0.2- 0.0 080807 675 0.4- 0.5- 090529 675 0.0 0.1-
080708 675 0.2+ 0.3+ 080807 675 0.2+ 0.0 090727 688 0.0 0.0
080709 675 0.3+ 0.2- 080807 675 0.4- 0.2- 090727 688 0.0 0.1-
080723 675 0.1- 0.2- 080823 807 0.3+ 0.0
Ephemeris:
2008 NW4 a,e,i = 45.59, 0.20, 23 q = 36.353
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2009 10 26 20 24.14 -09 46.5 36.748 36.819 93.4 1.5 21.9
2009 11 05 20 24.39 -09 47.2 36.915 36.817 83.5 1.5 21.9
2009 11 15 20 24.81 -09 47.2 37.080 36.815 73.7 1.5 21.9
2009 11 25 20 25.41 -09 46.4 37.236 36.813 63.9 1.4 21.9
2009 12 05 20 26.16 -09 44.8 37.380 36.811 54.2 1.2 21.9
2009 12 15 20 27.04 -09 42.5 37.505 36.809 44.5 1.1 21.9
2009 12 25 20 28.05 -09 39.4 37.610 36.807 34.8 0.9 21.8
Brian G. Marsden (C) Copyright 2009 MPC M.P.E.C. 2009-U109
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