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  • MPEC 2018-O52 : 2017 XR61

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    M.P.E.C. 2018-O52                                Issued 2018 July 30, 22:56 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
    
                                       2017 XR61
    
                               Revision to MPEC 2017-Y18
    
    Additional Observations:
         K17X61R KC2018 06 25.54361222 49 38.146-09 59 11.53         23.91GVEO052T12
         K17X61R KC2018 07 10.53338122 44 30.070-12 43 28.64         23.91GVEO052T12
         K17X61R KC2018 07 10.57115522 44 27.922-12 44 00.79         24.12GVEO052T12
         K17X61R  C2018 07 19.45024922 34 25.237-15 02 55.91         23.77GVEO052T12
         K17X61R  C2018 07 19.46206422 34 24.156-15 03 08.07         23.86GVEO052T12
         K17X61R  C2018 07 19.47367522 34 23.089-15 03 20.07         23.89GVEO052T12
    
    Observer details:
    T12 Mauna Kea-UH/Tholen NEO Follow-Up (2.24-m).  Observers D. Fohring, D. Hung.
        Measurer D. J. Tholen.  2.24-m f/10.1 reflector + CCD.
    
    First and last observations above in comparison with prediction:
    Residuals in seconds of arc, reference and Delta-T
    180625 T12 15.3+  6.3+    180719 T12 23.1+  8.9+    MPO431405   +0.0017 day
    
    Orbital elements:
    2017 XR61                                                Earth MOID = 0.0191 AU
    Epoch 2018 Mar. 23.0 TT = JDT 2458200.5                 MPC
    M  14.33739              (2000.0)            P               Q
    n   0.68510376     Peri.   76.01985     -0.99702778     -0.00798665
    a   1.2743786      Node   103.48069     -0.02177275     -0.92485889
    e   0.3259791      Incl.    4.51953     +0.07390235     -0.38022657
    P   1.44           H   23.1           G   0.15           U   4
    Residuals in seconds of arc
    171214 F51  0.3-  0.2-    171215 568  0.1-  0.0     171225 G96  0.3-  0.2+
    171214 F51  0.1-  0.1+    171215 568  0.0   0.0     171225 G96  0.4-  0.2-
    171214 F51  0.3-  0.1+    171215 568  0.1-  0.1+    171225 G96  0.2-  0.2+
    171214 F51  0.2-  0.2+    171215 568  0.1-  0.0     171225 G96  0.2-  0.2-
    171215 I52  0.3+  0.4+    171216 I52  0.2-  0.0     171230 291  0.0   0.2+
    171215 I52  0.3+  0.0     171216 I52  0.2+  0.1-    171230 291  0.3+  0.4+
    171215 I52  0.0   0.1-    171216 I52  0.3-  0.0     180112 I52  0.1+  0.2-
    171215 I52  0.2+  0.1-    171216 I52  0.4-  0.2-    180112 I52  0.1+  0.1-
    171215 926  0.5-  0.3+    171216 691  0.0   0.2+    180112 I52  0.2+  0.0
    171215 926  0.6+  0.1+    171216 691  0.1-  0.5-    180112 I52  0.6-  0.3-
    171215 291  0.5+  0.0     171216 691  0.1+  0.3-    180625 T12  0.0   0.0
    171215 926  0.1-  0.0     171220 I52  0.1+  0.1-    180710 T12  0.0   0.2+
    171215 291  0.7+  0.0     171220 I52  0.6-  0.6-    180710 T12  0.1-  0.0
    171215 291  0.6+  0.0     171220 I52  0.3-  0.2-    180719 T12  0.0   0.0
    171215 G96  0.3-  0.0     171220 691  0.3+  0.1+    180719 T12  0.0   0.1+
    171215 G96  0.0   0.2-    171220 691  0.7-  0.2-    180719 T12  0.0   0.1+
    171215 G96  0.1+  0.1+    171220 691  0.1+  0.2+
    
    Ephemeris:
    2017 XR61                a,e,i = 1.27, 0.33, 5                   q = 0.8590
    Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
    2018 06 30    22 49 33.9 -10 38 04   0.5300  1.3502   118.2    41.6    24.0
    ...
    2018 07 15    22 40 06.6 -13 49 53   0.4984  1.4164   135.6    30.1    23.6
    ...
    2018 07 23    22 28 58.1 -16 04 24   0.4895  1.4490   146.4    22.9    23.4
    ...
    2018 07 29    22 18 10.1 -17 52 11   0.4887  1.4723   154.8    17.1    23.3
    2018 07 30    22 16 12.1 -18 10 13   0.4892  1.4760   156.2    16.1    23.3
    2018 07 31    22 14 11.5 -18 28 10   0.4898  1.4798   157.6    15.2    23.2
    ...
    2018 08 06    22 01 28.0 -20 12 43   0.4975  1.5015   165.7     9.6    23.1
    ...
    2018 08 14    21 43 47.5 -22 15 00   0.5191  1.5287   171.9     5.4    23.0
    ...
    2018 08 29    21 15 07.3 -24 41 11   0.5946  1.5741   156.8    14.6    23.8
    
    A. U. Tomatic                (C) Copyright 2018 MPC           M.P.E.C. 2018-O52
    

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