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  • MPEC 2022-B20 : 2018 PG21

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    M.P.E.C. 2022-B20                              Issued 2022 January 23, 14:07 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 PG21                                
    
    
                               Revision to MPEC 2018-P101                           
    
    Additional Observations:
         K18P21G  C2017 12 14.52463 12 29 52.26 +18 05 53.7                VEB020G96
         K18P21G  C2017 12 14.52983 12 29 53.27 +18 05 48.1                VEB020G96
         K18P21G  C2017 12 14.54023 12 29 55.35 +18 05 38.4                VEB020G96
         K18P21G KC2022 01 07.52465213 24 40.23 +17 36 05.7          21.21GVEB020I52
         K18P21G KC2022 01 07.52858013 24 41.12 +17 36 01.7          21.52GVEB020I52
         K18P21G KC2022 01 07.53234813 24 41.98 +17 35 57.7          21.01GVEB020I52
         K18P21G KC2022 01 07.53388613 24 42.36 +17 35 56.0          21.50GVEB020I52
         K18P21G KC2022 01 22.49210414 28 10.03 +12 03 21.2          20.79GVEB020I52
         K18P21G KC2022 01 22.49414714 28 10.60 +12 03 17.9          20.46GVEB020I52
         K18P21G KC2022 01 22.49619014 28 11.11 +12 03 14.6          20.31GVEB020I52
    
    Observer details:
    G96 Mt. Lemmon Survey.  Observer D. C. Fuls.  Measurers E. J. Christensen, B.
        Gray, D. Rankin, F. C. Shelly.  1.5-m reflector + 10K CCD.
    I52 Steward Observatory, Mt. Lemmon Station.  Observers D. Rankin, D. C. Fuls.
        Measurers E. J. Christensen, G. A. Farneth, D. C. Fuls, A. R. Gibbs, A. D.
        Grauer, H. Groeller, R. A. Kowalski, S. M. Larson, G. J. Leonard, D.
        Rankin, R. L. Seaman, A. Serrrano, F. C. Shelly, K. W. Wierzchos, A.
        Serrano.
    
    First and last observations above in comparison with prediction:
    Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
    171214 G96 0.01+ 0.00+    220122 I52 0.56+ 0.58+    MPO473497   +1473 days
    
    Orbital elements:
    2018 PG21                                                Earth MOID = 0.0926 AU
    Epoch 2022 Jan. 21.0 TT = JDT 2459600.5                 Veres                   
    M 344.52127              (2000.0)            P               Q                  
    n   0.24447458     Peri.  188.61109     -0.68824015     +0.70454371             
    a   2.5330684      Node    38.18944     -0.64783690     -0.48948150             
    e   0.6429411      Incl.   16.25331     -0.32654687     -0.51383463             
    P   4.03           H   19.34          G   0.15           U   0                  
    Residuals in seconds of arc
    171214 G96  0.2+  0.3+    180814 H21  0.2-  0.2+    180909 291  0.3+  0.1+
    171214 G96  0.1-  0.2-    180814 807  0.1-  0.3-    180909 291  0.5+  0.2-
    171214 G96  0.1+  0.3+    180814 807  0.1-  0.3+    180909 291  0.1+  0.0
    180808 F51  0.3-  0.1-    180814 807  0.0   0.2-    180914 291  0.8+  0.4+
    180808 F51  0.0   0.2+    180816 679  0.1+  0.0     180914 291  0.6+  0.3-
    180808 F51  0.1+  0.0     180816 679  0.1-  0.0     220107 I52  0.0   0.1-
    180808 F51 (0.2-  0.3+)   180820 679  0.0   0.1+    220107 I52  0.1-  0.2+
    180810 807  0.1-  0.0     180820 679  0.3+  0.1+    220107 I52  0.2-  0.2+
    180810 807  0.0   0.0     180820 679  0.0   0.1+    220107 I52  0.3+  0.2+
    180810 807  0.1-  0.1+    180831 291  0.2-  0.7+    220122 I52  0.0   0.3-
    180812 807  0.0   0.1-    180831 291  0.2-  0.2+    220122 I52  0.1+  0.3-
    180812 807  0.1+  0.0     180905 291  0.0   0.6-    220122 I52  0.7-  0.2-
    180812 807  0.1+  0.0     180905 291  0.0   0.5-
    180814 H21  0.3-  0.1+    180905 291  0.1-  0.1-
    
    Ephemeris:
    2018 PG21                a,e,i = 2.53, 0.64, 16                  q = 0.9045
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
    2021 12 24    12 32 40.0 +21 12 19   1.0874  1.5064    93.2    40.7    22.0
    ...
    2022 01 08    13 26 30.7 +17 27 36   0.8878  1.3707    94.1    45.7    21.5
    ...
    2022 01 16    13 59 12.0 +14 45 02   0.7965  1.2992    93.1    49.1    21.2
    ...
    2022 01 22    14 25 52.9 +12 16 45   0.7361  1.2467    91.7    52.1    21.1
    2022 01 23    14 30 31.3 +11 49 33   0.7268  1.2380    91.4    52.6    21.0
    2022 01 24    14 35 13.1 +11 21 38   0.7178  1.2294    91.1    53.2    21.0
    ...
    2022 01 30    15 04 36.2 +08 18 06   0.6683  1.1788    88.8    56.7    20.9
    ...
    2022 02 07    15 46 58.6 +03 30 59   0.6168  1.1144    84.8    61.8    20.7
    ...
    2022 02 22    17 14 57.6 -06 56 31   0.5725  1.0090    75.3    71.4    20.7
    
    A. U. Tomatic                (C) Copyright 2022 MPC           M.P.E.C. 2022-B20
    


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