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  • MPEC 2021-C311 : 2018 PH22

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    M.P.E.C. 2021-C311                            Issued 2021 February 14, 15:01 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
    
                                    2018 PH22                                
    
    
                                Revision to MPEC 2018-Q4                            
    
    Additional Observations:
         K18P22H KC2019 04 04.57017714 49 17.920-15 44 40.01         24.40GVEC311T12
         K18P22H KC2019 04 05.57533214 47 31.053-15 34 29.89         24.29GVEC311T12
         K18P22H KC2021 02 10.64585815 14 12.093-25 15 54.84         22.66GVEC311T12
    
    Observer details:
    T12 Mauna Kea-UH/Tholen NEO Follow-Up (2.24-m).  Observers D. J. Tholen, 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
    190404 T12  1.6-  0.4-    210210 T12 55.9- 58.9-    MPO473497   -0.03 days
    
    Orbital elements:
    2018 PH22                                           PHA, Earth MOID = 0.0417 AU
    Epoch 2020 Dec. 17.0 TT = JDT 2459200.5                 Veres
    M 359.24413              (2000.0)            P               Q
    n   0.46425571     Peri.  225.95482     +0.32798782     -0.94431818
    a   1.6518269      Node   204.93406     +0.88353687     +0.31646150
    e   0.6119626      Incl.    3.56501     +0.33434503     +0.09008494
    P   2.12           H   21.8           G   0.15           U   0
    Residuals in seconds of arc
    180713 F51  0.3-  0.0     180814 691  1.5+  1.3-    180906 T12  0.0   0.0
    180713 F51  0.1+  0.0     180815 204  0.0   0.1+    180906 T12  0.0   0.0
    180713 F51  0.2+  0.1-    180815 204  0.2-  0.3+    180908 474  0.0   0.2-
    180812 F51  0.1-  0.1-    180815 L01  0.0   0.1-    180908 474  0.1+  0.5-
    180812 F51  0.1-  0.0     180815 204  0.2-  0.1+    180908 474  0.4+  0.3+
    180812 F51  0.1-  0.1-    180815 L01  0.2+  0.1-    180908 474  1.0+  0.5+
    180813 H21  0.6-  0.4+    180828 695  0.1+  0.5+    180908 474  0.6+  0.7-
    180813 H21  0.1+  0.7+    180828 695  0.1+  0.0     180908 474  0.0   0.5-
    180813 H21  0.1+  0.2+    180828 695  0.0   0.2+    180914 I52  0.3-  0.2+
    180813 H21  0.1+  0.4+    180829 691  0.2-  0.3+    180914 I52  0.4-  0.2-
    180814 H21  0.1-  0.1+    180829 691  0.3-  0.1-    180914 I52  0.1-  0.5-
    180814 H21  0.2-  0.2+    180831 691  0.2+  0.3+    190404 T12  0.1-  0.1+
    180814 691  0.5+  0.5+    180831 691  0.3-  0.1+    190405 T12  0.1+  0.1-
    180814 691  0.4+  0.5-    180831 691  0.1-  0.5+    210210 T12  0.0   0.0
    
    Ephemeris:
    2018 PH22                a,e,i = 1.65, 0.61, 4                   q = 0.6410
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
    2021 01 15    16 48 38.3 -31 27 19   0.3021  0.7809    40.9   124.4    23.9
    ...
    2021 01 30    15 44 52.7 -28 00 33   0.3390  0.9253    69.9    89.9    22.5
    ...
    2021 02 07    15 23 15.7 -26 07 38   0.3566  1.0075    83.1    76.4    22.2
    ...
    2021 02 13    15 08 21.8 -24 41 08   0.3671  1.0696    92.7    67.2    22.1
    2021 02 14    15 05 52.1 -24 26 10   0.3687  1.0800    94.3    65.8    22.1
    2021 02 15    15 03 21.4 -24 10 58   0.3702  1.0903    96.0    64.3    22.1
    ...
    2021 02 21    14 47 45.7 -22 34 00   0.3790  1.1519   105.9    55.7    22.0
    ...
    2021 03 01    14 25 07.4 -20 04 52   0.3918  1.2327   119.7    44.3    21.9
    ...
    2021 03 16    13 38 29.8 -14 22 41   0.4332  1.3786   147.1    23.1    21.8
    
    A. U. Tomatic                (C) Copyright 2021 MPC           M.P.E.C. 2021-C311
    


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