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  • MPEC 2019-O50 : 2016 WA9

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    M.P.E.C. 2019-O50                                Issued 2019 July 23, 11:31 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 WA9                                 
    
                               Revision to MPEC 2016-W122                           
    
    Additional Observations:
         K16W09A KC2019 06 07.26032015 45 08.115-33 48 41.98         22.67GVEO050T12
         K16W09A  C2019 06 26.33686115 04 25.952-37 50 00.21         22.79GVEO050T12
         K16W09A  C2019 06 26.34008815 04 25.657-37 50 01.98         22.74GVEO050T12
    
    Observer details:
    T12 Mauna Kea-UH/Tholen NEO Follow-Up (2.24-m).  Observer 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
    190607 T12  1.1-  0.7-    190626 T12  0.9-  0.6-    MPO394797    0.00 days
    
    Orbital elements:
    2016 WA9                                                 Earth MOID = 0.2105 AU
    Epoch 2019 Apr. 27.0 TT = JDT 2458600.5                 MPC
    M 176.11378              (2000.0)            P               Q
    n   0.61081226     Peri.  357.27117     +0.56759341     -0.76851367
    a   1.3757226      Node    57.97011     +0.76181531     +0.35421293
    e   0.1288414      Incl.   20.38763     +0.31221011     +0.53284138
    P   1.61           H   21.7           G   0.15           U   1
    Residuals in seconds of arc
    160906 F51  0.0   0.2-    161127 033  0.1-  0.1-    161220 H21  0.1+  0.0
    160906 F51  0.0   0.3+    161127 033  0.0   0.2+    161220 H21  0.2+  0.1-
    160906 F51  0.2-  0.1+    161128 807  0.1-  0.2-    161220 H21  0.3+  0.0
    160906 F51  0.1-  0.0     161128 807  0.3-  0.3-    161220 H21  0.2+  0.1+
    161114 F51  0.0   0.4-    161128 807  0.1+  0.3-    161220 H21  0.1+  0.1+
    161114 F51  0.1-  0.3+    161128 033  0.3+  0.1-    161220 H21  0.2-  0.2+
    161114 F51  0.2+  0.6+    161128 033  0.2+  0.0     161223 H21  0.1+  0.7+
    161126 G96  0.0   0.3-    161128 033  0.2-  0.0     161223 H21  0.0   0.9+
    161126 G96  0.1+  0.7-    161128 033  0.1-  0.3-    161223 H21  0.2-  1.0+
    161126 G96  0.0   0.1+    161128 033  0.0   0.1-    190607 T12  0.0   0.1+
    161126 G96  0.1-  0.1-    161128 033  0.1+  0.3-    190626 T12  0.1-  0.0
    161127 807  0.1-  0.4-    161128 033  0.6-  0.2-    190626 T12  0.0   0.1-
    161127 807  0.4-  0.4-    161128 033  0.0   0.1-
    161127 807  0.4-  0.3-    161128 033  0.2+  0.4-
    
    Ephemeris:
    2016 WA9                 a,e,i = 1.38, 0.13, 20                  q = 1.1985
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
    2019 06 23    15 09 39.4 -37 18 49   0.6070  1.5329   140.2    25.1    22.7
    ...
    2019 07 08    14 53 26.9 -39 17 35   0.6928  1.5195   124.4    33.5    23.2
    ...
    2019 07 16    14 52 06.7 -40 08 50   0.7450  1.5111   117.3    36.7    23.4
    ...
    2019 07 22    14 54 01.5 -40 45 52   0.7856  1.5042   112.6    38.6    23.6
    2019 07 23    14 54 34.1 -40 52 00   0.7924  1.5030   111.8    38.9    23.6
    2019 07 24    14 55 10.3 -40 58 08   0.7992  1.5018   111.1    39.1    23.7
    ...
    2019 07 30    15 00 01.7 -41 34 56   0.8402  1.4943   106.9    40.6    23.8
    ...
    2019 08 07    15 09 34.1 -42 24 16   0.8946  1.4835   101.8    42.0    24.0
    ...
    2019 08 22    15 35 37.6 -43 54 44   0.9924  1.4614    93.6    43.7    24.2
    
    A. U. Tomatic                (C) Copyright 2019 MPC           M.P.E.C. 2019-O50
    


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