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  • MPEC 2009-C01 : 2001 DR8

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    Read MPEC 2009-B93 Read MPEC 2009-C02


    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
    

    Read MPEC 2009-B93 Read MPEC 2009-C02


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