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  • MPEC 2018-T171: 2016 XH2

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    M.P.E.C. 2018-T171                               Issued 2018 Oct. 15, 01:23 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
    
                                       2016 XH2
    
                               Revision to MPEC 2016-X62
    
    Additional Observations:
         K16X02H  C2018 10 11.44833402 26 56.824+14 55 47.95         23.46GVET171T12
         K16X02H  C2018 10 11.45856702 26 56.079+14 55 44.26         23.39GVET171T12
         K16X02H  C2018 10 12.47351502 25 44.394+14 49 28.95         23.59GVET171T12
         K16X02H  C2018 10 12.48515002 25 43.520+14 49 24.52         23.43GVET171T12
    
    Observer details:
    T12 Mauna Kea-UH/Tholen NEO Follow-Up (2.24-m).  Observers D. Hung, D. Fohring.
        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
    181011 T12 12.0-  3.8-    181012 T12 12.0-  3.9-    MPO450686   +0.0064 day
    
    Orbital elements:
    2016 XH2                                            PHA, Earth MOID = 0.0353 AU
    Epoch 2019 Apr. 27.0 TT = JDT 2458600.5                 MPC
    M 349.84175              (2000.0)            P               Q
    n   0.45565887     Peri.  305.04433     -0.97138886     -0.23727792
    a   1.6725387      Node   221.23237     +0.22260149     -0.89475826
    e   0.3868090      Incl.    0.88169     +0.08277836     -0.37829465
    P   2.16           H   21.2           G   0.15           U   1
    Residuals in seconds of arc
    161204 I52  0.4-  1.7-    161210 705  0.2+  0.0     170221 691  0.7+  0.0
    161204 I52  0.7+  0.1+    161210 705  0.3+  0.0     170221 691  1.3-  0.3+
    161204 I52  0.1+  0.5-    161210 705  0.2+  0.0     170224 T12  0.3+  0.1-
    161204 I52  0.2-  0.3-    161210 I52  0.1+  0.1-    170224 T12  0.3+  0.0
    161204 G96  0.1-  0.0     161210 I52  0.2+  0.1+    170224 T12  0.3+  0.1-
    161204 G96  0.3+  0.0     161210 I52  0.1+  0.3-    170224 T12  0.2+  0.1-
    161204 G96  0.2-  0.6+    161210 I52  0.3-  0.1+    170302 691  0.4-  0.1+
    161204 G96  0.0   0.2-    161218 I52  0.4-  0.1+    170302 691  0.1-  0.4+
    161204 G96  0.7+  0.2+    161218 I52  0.2-  0.0     170302 691  0.3-  0.2+
    161204 G96  0.2+  0.7-    161218 I52  0.3+  0.3+    170315 291  0.6+  0.1-
    161204 I52  0.3+  0.3+    161218 I52  0.1-  0.4-    170315 291  0.5+  0.2+
    161204 I52  0.2-  0.5-    161218 705  0.3+  0.1-    170315 291  0.3+  0.2+
    161204 G96  0.7-  0.4-    161218 705  0.5+  0.1-    170323 T12  0.4+  0.1-
    161204 I52  0.2+  0.9-    161218 705  0.5+  0.3-    170323 T12  0.3+  0.1-
    161204 G96  0.1-  0.5+    161218 G96  0.3+  0.4-    170329 691  1.3-  0.2-
    161204 I52  0.1+  0.4-    161218 G96  0.0   0.2-    170329 691  0.2-  0.0
    161204 033  0.2+  0.1+    161218 G96  0.0   0.2-    170329 691  1.0+  0.0
    161204 033  0.3+  0.1+    161218 G96  0.1+  0.4-    170421 T12  0.2+  0.1-
    161204 033  0.0   0.1+    161218 291  0.4-  0.0     170421 T12  0.2+  0.1-
    161204 033  0.3-  0.1+    161218 291  0.1-  0.4+    170421 T12  0.2+  0.1-
    161204 033  0.3+  0.0     161218 291  0.5+  1.0+    170422 691  0.1+  0.1+
    161204 033  0.1+  0.0     161219 H21  0.2+  0.1-    170422 691  0.4+  0.0
    161205 H01  0.2+  0.0     161219 H21  0.1+  0.0     170422 691  0.0   0.1+
    161205 H01  0.1+  0.0     161219 H21  0.1+  0.0     170422 691  0.2+  0.4+
    161205 H01  0.2+  0.0     161220 H21  0.2+  0.2-    170422 691  0.7-  0.1+
    161205 H01  0.2+  0.1-    161220 H21  0.3+  0.0     170422 926  0.3-  0.2+
    161205 G96  0.5+  0.1-    161220 H21  0.3+  0.0     170422 691  0.4+  0.1-
    161205 G96  0.3+  0.0     161221 H21  0.0   0.1-    170422 926  0.2-  0.1-
    161205 G96  0.5+  0.2+    161221 H21  0.2+  0.1-    170422 204  0.2+  0.0
    161205 I52  0.1+  0.2-    161221 H21  0.0   0.1-    170422 204  0.1+  0.2-
    161205 926  0.1+  0.1-    161223 T12  0.2+  0.0     170422 204  0.3+  0.3-
    161205 I52  0.0   0.1+    161223 T12  0.2+  0.0     170423 926  0.1+  3.2-
    161205 I52  0.2-  0.0     170105 I52  0.1+  0.3-    170423 926  0.2+  1.3-
    161205 I52  0.4-  0.5-    170105 I52  0.0   0.1-    170423 926  0.4+  0.8-
    161205 926  0.4-  0.1+    170105 I52  0.2-  0.4-    170424 926  0.1-  0.5+
    161205 926  0.1+  0.2+    170105 I52  0.0   0.2-    170424 691  0.3-  0.2+
    161205 246  0.3+  1.2+    170105 I52  0.7+  0.4-    170424 926  0.3-  0.1+
    161205 246  1.0-  0.5+    170105 I52  0.1+  0.6-    170424 691  0.2-  0.6+
    161205 246  0.4-  0.4+    170105 I52  0.2-  0.2-    170424 691  0.4-  0.3+
    161205 246  0.4-  0.0     170105 I52  0.1+  0.2-    170501 926  0.2-  0.7-
    161205 I93  0.1-  0.3-    170105 691  0.7-  0.4-    170501 926  0.1-  0.5-
    161205 587  0.2+  0.0     170105 691  0.8-  1.1+    170501 926  0.5+  1.5-
    161205 I93  0.0   0.1+    170105 691  0.1+  0.6-    170503 H21  0.2+  0.1-
    161205 587  0.0   0.3-    170106 G96  0.5+  1.0-    170503 H21  0.3-  0.8-
    161205 I93  0.2+  0.2+    170106 G96  0.3+  0.3-    170514 G96  0.2+  0.4+
    161206 I52  0.4-  0.3+    170106 G96  0.1+  0.1-    170514 G96  0.2-  0.2+
    161206 I52  0.1-  0.2+    170106 G96  0.2+  0.3-    170514 G96  0.2+  0.3+
    161206 I52  0.3-  0.1+    170119 G96  0.0   0.1-    170514 G96  0.0   0.3+
    161206 I52  0.2-  0.2+    170119 G96  0.2+  0.2+    170522 G96  0.5-  0.3+
    161206 K51  0.2-  0.2+    170119 G96  0.3+  0.1-    170522 G96  0.7-  1.1-
    161206 K51  0.1-  0.1+    170119 G96  0.2+  0.1-    170522 G96  0.7+  0.3+
    161206 K51  0.3-  0.1-    170119 691  0.0   0.1-    170522 G96  0.0   0.5-
    161206 K51  0.2-  0.2+    170119 691  0.4-  0.1+    170617 G96  0.1-  0.2-
    161206 K51  0.3-  0.3+    170119 691  0.2+  0.4-    170617 G96  0.4+  0.1-
    161207 204  0.4+  0.0     170131 T12  0.2+  0.1-    170617 G96  0.1+  0.3+
    161207 204  0.1+  0.0     170131 T12  0.2+  0.1-    170617 G96  0.9+  1.6+
    161207 204  0.2-  0.2-    170131 T12  0.2+  0.0     181011 T12  0.1-  0.0
    161209 I52  0.1-  0.3+    170131 T12  0.2+  0.0     181011 T12  0.0   0.0
    161209 I52  0.4-  0.1-    170216 H21  0.3-  0.3-    181012 T12  0.0   0.0
    161209 I52  0.1-  0.4-    170216 H21  0.2-  0.1-    181012 T12  0.0   0.0
    161209 I52  0.3+  0.5-    170216 H21  0.4-  0.3-
    
    Ephemeris:
    2016 XH2                 a,e,i = 1.67, 0.39, 1                   q = 1.0256
    Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
    2018 09 15    02 43 18.5 +16 19 53   1.3031  2.0830   128.4    22.2    24.4
    ...
    2018 09 30    02 37 34.5 +15 50 22   1.1319  2.0326   144.6    16.6    23.9
    ...
    2018 10 08    02 30 42.5 +15 15 21   1.0563  2.0038   154.2    12.5    23.6
    ...
    2018 10 14    02 23 52.6 +14 39 40   1.0087  1.9813   161.9     9.0    23.3
    2018 10 15    02 22 36.6 +14 32 58   1.0016  1.9774   163.2     8.4    23.3
    2018 10 16    02 21 18.8 +14 26 03   0.9947  1.9736   164.5     7.8    23.2
    ...
    2018 10 22    02 12 54.8 +13 40 29   0.9587  1.9500   172.6     3.7    22.9
    ...
    2018 10 30    02 00 34.9 +12 31 00   0.9254  1.9175   176.2     2.0    22.7
    ...
    2018 11 14    01 37 36.5 +10 13 14   0.9081  1.8528   155.0    13.0    23.1
    
    A. U. Tomatic                (C) Copyright 2018 MPC           M.P.E.C. 2018-T171
    

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