[Iaude] MPEC S67: 2018 PK21 [a=0.99,e=0.08,i=1.2,H=25.9]

mpec at marsden.cfa.harvard.edu mpec at marsden.cfa.harvard.edu
Mon Sep 23 11:57:34 EDT 2019


M.P.E.C. 2019-S67                            Issued 2019 September 23, 15:55 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 at CFA.HARVARD.EDU
            URL https://www.minorplanetcenter.net/    ISSN 1523-6714

                                   2018 PK21                                    


                           Revision to MPEC 2018-P104                           

Additional Observations:
     K18P21K KC2019 09 19.42478 01 38 20.41 +24 38 08.0          21.7 RoES067691
     K18P21K KC2019 09 19.44260 01 38 17.17 +24 38 16.2          22.2 RoES067691
     K18P21K KC2019 09 19.46042 01 38 13.92 +24 38 24.7          22.0 RoES067691
     K18P21K KC2019 09 22.37978 01 30 45.22 +25 03 25.0          21.5 RoES067691
     K18P21K KC2019 09 22.38475 01 30 44.08 +25 03 27.5          20.4 RoES067691
     K18P21K KC2019 09 22.38970 01 30 42.99 +25 03 29.8          21.8 RoES067691

Observer details:
691 Steward Observatory, Kitt Peak-Spacewatch.  Observers T. H. Bressi, M. T. 
   Read.  0.9-m f/3 reflector + CCD.

First and last observations above in comparison with prediction:
Residuals in seconds of arc, reference and Delta-T
190919 691  5.8-  1.5-    190922 691  5.9-  1.6-    MPO473497   +0.00 days

Orbital elements:
2018 PK21                                                Earth MOID = 0.0071 AU
Epoch 2019 Apr. 27.0 TT = JDT 2458600.5                 Veres
M  44.04248              (2000.0)            P               Q
n   1.00361244     Peri.  224.30428     -0.98386298     -0.17811324
a   0.9880040      Node   305.42844     +0.16941277     -0.89676535
e   0.0805474      Incl.    1.19608     +0.05755821     -0.40507726
P   0.98           H   25.9           G   0.15           U   4
Residuals in seconds of arc
180811 F51  0.0   0.0     180817 679  0.0   0.1+    180908 691  0.4+  0.3+
180811 F51  0.1+  0.0     180817 679  0.0   0.1+    180913 H21  0.1+  0.0
180811 F51  0.1+  0.0     180819 H21  0.1+  0.1-    180913 H21  0.1-  0.0
180811 F51  0.1+  0.1+    180819 H21  0.2+  0.2+    180913 291  0.2-  0.1+
180811 F51  0.1+  0.0     180819 H21  0.1-  0.2+    180913 291  0.3+  0.3+
180811 F51  0.0   0.1+    180822 291  0.1-  0.1-    180914 H21  0.3+  0.7+
180811 F51  0.1+  0.0     180822 291  0.2-  0.0     180914 H21  0.1+  0.4+
180811 104  0.8-  0.6-    180822 291  0.2-  0.2+    180914 H21  0.3+  0.1-
180811 104  0.4-  1.2-    180823 H21  0.2+  0.1-    180915 H21  0.1-  0.2+
180811 104  0.2+  0.7-    180823 H21  0.4-  0.5+    180915 H21  0.2-  0.2+
180812 L01  0.6-  0.0     180829 695  0.1+  0.1-    180916 H21  0.1+  0.4-
180812 L01  0.3+  0.7+    180829 695  0.1+  0.0     180916 H21  0.3+  0.3-
180812 L01  0.2-  0.1+    180831 691  0.3-  0.3-    180916 291  0.7-  0.8+
180812 H21  0.2+  0.3-    180831 691  0.3-  0.0     180916 291  0.6+  0.2-
180812 H21  0.5+  0.1+    180904 I52  0.3+  0.1+    180917 291  0.0   0.4-
180812 H21  0.2+  0.3-    180904 I52  0.0   0.4-    180917 291  0.3-  0.3+
180812 734  0.0   0.2+    180904 I52  0.0   0.1+    180917 291  0.0   0.3-
180812 734  0.5+  0.1+    180904 I52  0.1-  0.0     181007 807  0.2-  0.2-
180812 734  0.6-  0.2+    180905 291  0.0   0.0     181007 807  0.2-  0.3-
180814 807  0.1-  0.0     180905 291  0.2-  0.0     181007 807  0.3-  0.2-
180814 807  0.1-  0.2-    180905 291  0.3+  0.0     190919 691  0.6-  0.2+
180814 807  0.3-  0.1-    180907 691  0.0   0.2-    190919 691  0.0   0.5-
180817 679  0.2-  0.1+    180907 691  0.3-  0.0     190919 691  0.1+  0.4-
180817 679  0.0   0.0     180907 691  0.2+  0.1-    190922 691  0.9+  0.3-
180817 679  0.1-  0.0     180908 691  0.2-  0.2+    190922 691  0.0   0.1+
180817 679  0.1-  0.0     180908 691  0.3-  0.1-    190922 691  0.4-  0.3+

Ephemeris:
2018 PK21                a,e,i = 0.99, 0.08, 1                   q = 0.9084
Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
2019 08 24    01 58 27.7 +18 17 51   0.1101  1.0645   116.2    58.5    23.3
...
2019 09 08    01 56 15.0 +22 15 15   0.09025 1.0671   129.3    47.0    22.6
...
2019 09 16    01 45 33.6 +24 01 35   0.08038 1.0666   137.9    39.2    22.1
...
2019 09 22    01 31 48.9 +25 00 48   0.07377 1.0653   145.2    32.6    21.8
2019 09 23    01 28 59.6 +25 08 01   0.07276 1.0651   146.4    31.4    21.7
2019 09 24    01 26 01.0 +25 14 18   0.07178 1.0647   147.7    30.3    21.6
...
2019 09 30    01 05 04.8 +25 28 02   0.06667 1.0625   154.9    23.6    21.3
...
2019 10 08    00 31 18.3 +24 28 54   0.06232 1.0583   160.5    18.4    20.9
...
2019 10 23    23 30 28.8 +19 06 03   0.06210 1.0472   146.0    32.1    21.3

A. U. Tomatic                (C) Copyright 2019 MPC           M.P.E.C. 2019-S67




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