MPEC 2009-C01 : 2001 DR8
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M.P.E.C. 2009-C01 Issued 2009 Feb. 1, 01:36 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
2001 DR8
Revision to MPEC 2001-D12
Additional Observations:
K01D08R C2009 01 31.41126 10 52 53.10 +09 42 17.7 20.4 V EC001691
K01D08R C2009 01 31.42957 10 52 50.65 +09 42 27.0 20.4 V EC001691
K01D08R C2009 01 31.44763 10 52 48.21 +09 42 36.2 20.6 V EC001691
K01D08R C2009 01 31.49080 10 52 42.43 +09 42 58.6 20.3 V EC001291
K01D08R C2009 01 31.49465 10 52 41.92 +09 43 00.7 20.4 V EC001291
K01D08R C2009 01 31.49845 10 52 41.40 +09 43 02.5 20.4 V EC001291
K01D08R C2009 01 31.50300 10 52 40.81 +09 43 04.6 20.3 V EC001291
K01D08R C2009 01 31.50668 10 52 40.31 +09 43 06.5 20.3 V EC001291
K01D08R C2009 01 31.51108 10 52 39.71 +09 43 08.7 20.3 V EC001291
K01D08R C2009 01 31.94529 10 51 43.74 +09 46 50.1 19.8 C EC001493
K01D08R C2009 01 31.95120 10 51 43.04 +09 46 53.5 20.1 C EC001493
K01D08R C2009 01 31.98822 10 51 37.96 +09 47 10.8 EC001J95
K01D08R C2009 01 31.99641 10 51 36.81 +09 47 15.8 EC001J95
K01D08R C2009 02 01.00417 10 51 35.75 +09 47 19.0 20.3 R EC001J95
Observer details:
291 LPL/Spacewatch II. Observer R. S. McMillan. 1.8-m f/2.7 reflector + CCD.
493 Calar Alto. Observer F. Hormuth. 1.23-m reflector + CCD.
691 Steward Observatory, Kitt Peak. Observer R. S. McMillan. 0.9-m f/3
reflector + CCD.
J95 Great Shefford. Observer P. Birtwhistle. 0.40-m f/6.0 Schmidt-Cassegrain
+ CCD.
First and last observations above in comparison with prediction:
Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
090131 691 3.36+ 2.24- 090201 J95 3.40+ 2.24- MPO 53678 -7.6 day
Orbital elements:
2001 DR8 Earth MOID = 0.0797 AU
Epoch 2008 Nov. 30.0 TT = JDT 2454800.5 MPC
M 21.73554 (2000.0) P Q
n 0.36901736 Peri. 43.23070 +0.94872580 -0.31231494
a 1.9250330 Node 334.84477 +0.24964914 +0.83495314
e 0.6724650 Incl. 6.58857 +0.19389345 +0.45311437
P 2.67 H 18.9 G 0.15 U 5
Residuals in seconds of arc
010216 691 0.2- 0.6+ 010219 926 0.4- 0.5+ 090131 691 0.2+ 0.1-
010216 691 0.1+ 0.2+ 010223 691 0.3- 0.1- 090131 691 0.0 0.1-
010216 691 0.3+ 0.6+ 010223 691 0.1+ 0.5+ 090131 291 0.0 0.3+
010217 691 0.6- 0.0 010223 691 0.5- 0.2+ 090131 291 0.1+ 0.4+
010217 691 0.7- 0.0 010227 691 0.7+ 1.5- 090131 291 0.1- 0.3+
010217 691 0.7- 0.1- 010227 691 0.5- 0.4- 090131 291 0.2+ 0.1+
010217 926 0.4+ 0.1+ 010227 691 0.5- 0.0 090131 291 0.1+ 0.1+
010217 926 1.1- 0.2- 010315 691 0.6+ 0.9+ 090131 291 0.1- 0.1+
010219 691 1.0+ 0.7- 010315 691 0.6- 0.0 090131 493 0.0 0.6-
010219 926 0.1- 0.1+ 010315 691 0.2+ 0.5+ 090131 493 1.3+ 0.3-
010219 691 0.3+ 0.2- 010316 691 0.7+ 0.5- 090131 J95 0.5+ 0.3-
010219 926 0.9- 0.1+ 010316 691 1.2- 0.4+ 090131 J95 0.3- 0.5+
010219 926 (2.4- 0.1-) 010316 691 0.8+ 0.2+ 090201 J95 0.7- 0.3-
010219 691 1.3+ 1.1- 090131 691 0.1+ 0.0
Ephemeris:
2001 DR8 a,e,i = 1.93, 0.67, 7 q = 0.6305
Date TT R. A. (2000) Decl. Delta r Elong. Phase V
2009 01 29 10 58.07 +09 21.9 0.836 1.746 146.9 18.0 20.7
2009 02 08 10 36.03 +10 47.5 0.870 1.835 162.6 9.3 20.5
2009 02 18 10 14.25 +12 06.4 0.932 1.920 177.9 1.1 20.3
2009 02 28 09 55.36 +13 07.8 1.024 2.002 167.0 6.4 20.9
2009 03 10 09 41.02 +13 47.6 1.144 2.080 153.5 12.3 21.5
2009 03 20 09 31.63 +14 07.0 1.286 2.155 141.3 16.8 22.0
(Last issue was M.P.E.C. 2009-B93)
Timothy B. Spahr (C) Copyright 2009 MPC M.P.E.C. 2009-C01
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