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  • MPEC 2012-D61 : 2010 DF1

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    M.P.E.C. 2012-D61                                Issued 2012 Feb. 25, 23:53 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 https://www.minorplanetcenter.net/    ISSN 1523-6714
    
                                       2010 DF1
    
                               Revision to MPEC 2010-D40
    
    Additional Observations:
         K10D01F  C2012 02 25.28637 09 26 30.51 +10 27 49.2          21.0 VrED061G96
         K10D01F  C2012 02 25.29331 09 26 29.51 +10 28 11.3          21.3 VrED061G96
         K10D01F  C2012 02 25.29965 09 26 28.57 +10 28 30.6          21.4 VrED061G96
         K10D01F  C2012 02 25.30749 09 26 27.38 +10 28 55.2          21.8 VrED061G96
         K10D01F  C2012 02 25.31541 09 26 26.23 +10 29 19.7          20.7 VrED061G96
         K10D01F  C2012 02 25.32331 09 26 25.00 +10 29 44.5          20.9 VrED061G96
         K10D01F mC2012 02 25.37360 09 26 17.65 +10 32 19.3                oED061291
         K10D01F mC2012 02 25.37652 09 26 17.21 +10 32 28.5                oED061291
         K10D01F mC2012 02 25.37942 09 26 16.76 +10 32 37.6                oED061291
         K10D01F  C2012 02 25.38674 09 26 15.63 +10 32 59.2          21.4 RoED061H01
         K10D01F  C2012 02 25.39018 09 26 15.13 +10 33 09.8          21.0 RoED061H01
         K10D01F  C2012 02 25.40113 09 26 13.52 +10 33 43.7          20.8 RoED061H01
         K10D01F  C2012 02 25.40740 09 26 12.63 +10 34 02.9          21.2 RoED061H01
         K10D01F KC2012 02 25.95126 09 24 56.60 +11 02 16.4                uED061J95
         K10D01F KC2012 02 25.96878 09 24 54.05 +11 03 12.0          21.2 RuED061J95
    
    Observer details:
    291 LPL/Spacewatch II.  Observer R. S. McMillan.  1.8-m f/2.7 reflector + CCD.
    G96 Mt. Lemmon Survey.  Observer E. J. Christensen.  Measurers J. D. Ahern,
        E. C. Beshore, A. Boattini, A. R. Gibbs, A. D. Grauer, R. E. Hill,
        R. A. Kowalski, S. M. Larson, R. H. McNaught.  1.5-m reflector + CCD.
    H01 Magdalena Ridge Observatory, Socorro.  Observers W. H. Ryan, E. V. Ryan.
        Measurer W. H. Ryan.  2.4-m f/8.9 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
    120225 G96 5.51- 0.14-    120225 J95 5.53- 0.20-    MPO174060   +3.0 day
    
    Orbital elements:
    2010 DF1                                            PHA, Earth MOID = 0.0440 AU
    Epoch 2012 Mar. 14.0 TT = JDT 2456000.5                 MPC
    M 322.35291              (2000.0)            P               Q
    n   0.48761751     Peri.  101.65958     -0.20549645     +0.96785988
    a   1.5986370      Node   155.00689     -0.97697935     -0.19420802
    e   0.5033427      Incl.   20.06796     -0.05729371     -0.15978269
    P   2.02           H   21.9           G   0.15           U   3
    Residuals in seconds of arc
    100217 691  0.4-  1.0+    100218 926  0.8+  0.5+    100311 G58  0.3+  0.2+
    100217 691  0.6-  0.2-    100223 950  0.4-  0.0     100311 G58  0.2-  0.0
    100217 691  0.1-  0.2+    100223 950  0.1+  0.0     100311 695  0.2+  1.1-
    100217 291  0.2+  0.2+    100223 950  0.3-  0.1-    100311 695  0.5+  1.3-
    100217 291  0.3+  0.5-    100223 950  0.5-  0.2-    100311 695  0.3+  0.9+
    100217 291  0.2+  0.2-    100224 291  0.3+  0.4-    100311 695 (1.0-  2.4+)
    100217 H01  0.2+  0.1-    100224 291  0.1+  0.6-    120225 G96  0.4-  0.9-
    100217 H01  0.1+  0.2-    100224 291  0.2+  1.2-    120225 G96  0.0   0.2-
    100217 H01  0.2+  0.1-    100304 291  0.7-  0.3+    120225 G96  0.1+  0.5-
    100217 H01  0.2+  0.1-    100304 H36  0.0   0.1+    120225 G96  0.3-  0.1-
    100218 291  0.1+  0.0     100304 291  0.0   1.3+    120225 G96  0.1+  0.0
    100218 291  0.2-  0.1+    100304 291  0.2+  0.5-    120225 G96  0.8-  0.4+
    100218 291  0.2-  0.4+    100304 H36  0.2+  0.2+    120225 291  0.3+  0.1-
    100218 H21  0.3+  0.0     100304 H36  0.1-  0.7-    120225 291  0.1+  0.1+
    100218 H21  0.4+  0.6-    100305 291  0.3+  0.4+    120225 291  0.2-  0.2+
    100218 H21  0.2+  0.3+    100305 291  0.2-  0.3+    120225 H01  0.2-  0.1+
    100218 H01  0.2+  0.2+    100305 291  0.9-  0.1-    120225 H01  0.2-  0.1+
    100218 H01  0.3+  0.1+    100311 926  0.3+  0.4-    120225 H01  0.3-  0.3+
    100218 H01  0.2+  0.1-    100311 926  0.3+  0.3+    120225 H01  0.0   0.2+
    100218 H01  0.2+  0.1+    100311 926  0.8+  0.4-    120225 J95  0.3-  0.1-
    100218 926  0.8+  0.5-    100311 G58  0.1-  0.5-    120225 J95  0.5+  0.4+
    
    Ephemeris:
    2010 DF1                 a,e,i = 1.60, 0.50, 20                  q = 0.7940
    Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
    2012 01 26    10 10 09.8 -04 27 52   0.6827  1.5971   146.1    20.1    23.1
    ...
    2012 02 10    09 55 31.6 +00 18 47   0.5169  1.4911   164.5    10.2    22.0
    ...
    2012 02 18    09 42 07.3 +04 52 36   0.4475  1.4321   171.2     6.0    21.4
    ...
    2012 02 24    09 29 29.0 +09 22 54   0.4057  1.3868   166.1     9.9    21.3
    2012 02 25    09 27 10.9 +10 13 15   0.3997  1.3792   164.6    11.0    21.3
    2012 02 26    09 24 49.7 +11 05 02   0.3939  1.3715   163.0    12.2    21.3
    ...
    2012 03 03    09 09 45.9 +16 42 37   0.3650  1.3252   152.2    20.4    21.3
    ...
    2012 03 11    08 47 53.2 +25 02 09   0.3407  1.2626   136.5    32.8    21.4
    ...
    2012 03 26    08 05 36.7 +40 39 11   0.3299  1.1439   108.1    56.0    21.8
    
    A. U. Tomatic                (C) Copyright 2012 MPC           M.P.E.C. 2012-D61
    

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