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  • MPEC 2017-R45 : 2013 AN20

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    M.P.E.C. 2017-R45                                Issued 2017 Sept. 11, 02:54 UT
    
         The Minor Planet Electronic Circulars contain information on unusual
             minor planets and routine data on comets.  They are published
        on behalf of Division F 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
    
                                       2013 AN20
    
                               Revision to MPEC 2013-A34
    
    Additional Observations:
         K13A20N  C2017 07 17.43397019 21 14.636-27 52 49.33         23.4 GUER045T14
         K13A20N  C2017 07 17.43566519 21 14.442-27 52 51.27         23.3 GUER045T14
         K13A20N  C2017 07 17.43735819 21 14.232-27 52 53.24         23.1 GUER045T14
         K13A20N  C2017 07 17.43912819 21 14.013-27 52 55.22         23.5 GUER045T14
         K13A20N  C2017 07 17.44081819 21 13.809-27 52 57.17         23.4 GUER045T14
         K13A20N  C2017 07 17.44250919 21 13.606-27 52 59.04         23.1 GUER045T14
         K13A20N  C2017 07 19.44486119 17 20.268-28 30 52.33         23.1 GUER045T14
         K13A20N  C2017 07 19.44654519 17 20.065-28 30 54.20         23.4 GUER045T14
         K13A20N  C2017 07 19.44823019 17 19.861-28 30 55.98         23.2 GUER045T14
    
    Observer details:
    T14 Mauna Kea-UH/Tholen NEO Follow-Up (CFHT).  Observer L. Wells.  Measurer
        D. J. Tholen.  3.6-m Canada-France-Hawaii Telescope.
    
    First and last observations above in comparison with prediction:
    Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
    170717 T14 0.16- 0.04+    170719 T14 0.16- 0.05+    MPO273981   +0.28 day
    
    Orbital elements:
    2013 AN20                                           PHA, Earth MOID = 0.0367 AU
    Epoch 2017 Sept. 4.0 TT = JDT 2458000.5                 MPC
    M 226.60583              (2000.0)            P               Q
    n   0.55609854     Peri.  355.76869     -0.19891511     -0.90426402
    a   1.4645410      Node   105.37244     +0.91025628     -0.31332184
    e   0.3048374      Incl.   23.06823     +0.36313398     +0.29006207
    P   1.77           H   21.8           G   0.15           U   1
    Residuals in seconds of arc
    130106 704  0.3+  0.2+    130107 204  0.2-  0.0     130115 H21  0.0   0.2-
    130106 704  0.2+  0.6+    130107 204  0.1-  0.2+    130115 H21  0.1-  0.2-
    130106 704  0.5-  0.1+    130107 235  0.0   0.2+    130115 H21  0.0   0.1-
    130106 704  0.1-  0.6+    130107 235  0.3-  0.4+    130118 H21  0.1+  0.1+
    130106 704  0.5-  0.8+    130108 H21  0.3+  0.3-    130118 H21  0.6+  0.2+
    130107 703  0.5-  0.9+    130108 H21  0.1+  0.1-    130118 H21  0.3+  0.0
    130107 703  0.2-  0.0     130108 H21  0.2+  0.0     130118 H21  0.6+  0.0
    130107 703  0.5+  0.2-    130108 H21  0.4+  0.2+    130118 H21  0.9+  0.1+
    130107 703  0.9-  0.1+    130108 H21  0.5+  0.2+    130121 290  0.5-  0.4+
    130107 300  0.2+  0.8-    130108 H21  0.6+  0.4+    130121 290  0.0   0.4+
    130107 300  0.3+  0.4-    130108 H21  0.5+  0.2+    130121 290  0.1+  0.4+
    130107 300  0.2+  0.3-    130108 J16  0.3+  0.1+    130319 695  0.1-  0.2+
    130107 300  0.0   0.9-    130108 J16  0.1-  0.5+    130319 695  0.1-  0.3+
    130107 300  0.2+  0.5-    130108 J16  0.1-  0.0     130319 695  0.1-  0.6+
    130107 300  0.3+  0.2-    130108 J16  0.1-  0.0     130319 695  0.2+  0.3+
    130107 900  0.1+  0.0     130108 J16  0.2-  0.0     130320 695  0.1+  0.4-
    130107 900  0.1+  0.3+    130109 G48  0.1-  0.5+    130320 695  0.2+  0.2+
    130107 900  0.1+  0.1+    130109 G48  0.4-  0.1+    130320 695  0.2+  0.2+
    130107 E10  0.3-  0.2-    130109 G48  0.3-  0.1+    130320 695  0.2+  0.1+
    130107 E10  0.3-  0.3-    130109 G48  0.2-  0.2+    170717 T14  0.0   0.0
    130107 461  0.7-  0.4-    130109 G48  0.1+  0.1+    170717 T14  0.1+  0.0
    130107 461  0.1+  0.1-    130109 G48  0.2+  0.3+    170717 T14  0.0   0.0
    130107 461  0.5-  0.3+    130109 H21  0.1+  0.4-    170717 T14  0.0   0.0
    130107 461  0.4-  0.0     130110 H21  0.1+  0.3-    170717 T14  0.0   0.0
    130107 595  0.3-  0.4-    130110 H21  0.0   0.4-    170717 T14  0.0   0.1+
    130107 595  0.3+  0.3-    130110 H21  0.0   0.1-    170719 T14  0.0   0.0
    130107 595  0.3-  0.1-    130110 H21  0.0   0.2-    170719 T14  0.0   0.0
    130107 204  0.1-  0.3-    130110 H21  0.0   0.2-    170719 T14  0.0   0.1+
    130107 204  0.1-  0.3-    130110 H21  0.0   0.2-
    
    Ephemeris:
    2013 AN20                a,e,i = 1.46, 0.30, 23                  q = 1.0181
    Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
    2017 08 12    18 38 58.5 -34 12 47   0.9865  1.8654   137.7    21.4    24.2
    ...
    2017 08 27    18 28 26.3 -36 12 57   1.1003  1.8402   121.3    28.0    24.6
    ...
    2017 09 04    18 27 59.7 -36 55 19   1.1693  1.8245   113.6    30.4    24.8
    ...
    2017 09 10    18 29 50.2 -37 19 47   1.2230  1.8117   108.3    31.9    24.9
    2017 09 11    18 30 18.8 -37 23 19   1.2320  1.8095   107.4    32.1    24.9
    2017 09 12    18 30 50.2 -37 26 43   1.2411  1.8073   106.6    32.3    24.9
    ...
    2017 09 18    18 34 55.2 -37 44 10   1.2955  1.7933   101.7    33.3    25.0
    ...
    2017 09 26    18 42 42.6 -38 00 12   1.3677  1.7734    95.6    34.2    25.1
    ...
    2017 10 11    19 03 26.2 -38 09 12   1.4972  1.7320    85.4    35.1    25.3
    
    A. U. Tomatic                (C) Copyright 2017 MPC           M.P.E.C. 2017-R45
    

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