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  • MPEC 2021-M81 : 2020 HY

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    M.P.E.C. 2021-M81                                 Issued 2021 June 23, 14:00 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
    
                                     2020 HY                                 
    
    
                               Revision to MPEC 2020-H39                            
    
    Additional Observations:
         K20H00Y  C2021 06 05.49399217 45 01.665+22 29 00.33         23.52GVEM081T12
         K20H00Y  C2021 06 05.50270417 44 59.765+22 29 15.60         23.46GVEM081T12
         K20H00Y  C2021 06 05.51138517 44 57.868+22 29 30.78         23.28GVEM081T12
         K20H00Y  C2021 06 05.52030417 44 55.917+22 29 46.33         23.35GVEM081T12
         K20H00Y KC2021 06 06.51699517 41 23.487+22 58 29.68         24.37GVEM081T12
    
    Observer details:
    T12 Mauna Kea-UH/Tholen NEO Follow-Up (2.24-m).  Observer 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
    210605 T12 89.4-  4.8-    210606 T12 89.6-  6.2-    MPO546175    -311 days
    
    Orbital elements:
    2020 HY                                                  Earth MOID = 0.0118 AU
    Epoch 2021 July 5.0 TT = JDT 2459400.5                  Veres
    M 234.44048              (2000.0)            P               Q
    n   1.15666962     Peri.  224.49518     +0.33098362     -0.93272966
    a   0.8988002      Node   207.15230     +0.92936895     +0.34847438
    e   0.5524489      Incl.   18.26879     +0.16347229     -0.09263359
    P   0.85           H   23.0           G   0.15           U   3
    Residuals in seconds of arc
    200417 F51  0.0   0.1+    200419 I52  0.1+  0.3+    200423 K87  0.2-  0.1-
    200417 F51  0.1-  0.1+    200419 I52  0.1+  0.0     200423 K87  0.0   0.0
    200417 F51  0.1+  0.0     200419 I52  0.1+  0.1+    200424 703  0.1-  0.1-
    200417 F51  0.3+  0.1-    200419 I52  0.2+  0.2-    200424 703  0.4-  0.5-
    200417 033  0.1-  0.3-    200419 T05 (1.6-  0.9+)   200424 703  0.5-  0.4-
    200417 033  0.3-  0.1-    200419 T05  0.7+  0.8-    200424 I52  0.7-  0.2+
    200417 033  0.8-  0.0     200419 T05  1.1-  0.1-    200424 I52  1.0-  0.3+
    200417 L01  0.1-  0.1-    200419 T05  0.4+  0.6-    200424 I52  0.3+  0.0
    200418 L01  0.0   0.0     200420 F51  0.2+  0.1-    200424 I52  0.2+  0.8-
    200418 L01  0.1-  0.0     200420 F51  0.1+  0.1-    200426 I52  0.5+  0.6-
    200418 L01  0.2+  0.1+    200420 F51  0.0   0.0     200426 I52  0.0   0.2-
    200418 033  0.3-  0.4-    200421 Z99  0.0   0.3+    200426 I52  0.1+  0.4-
    200418 033  0.2-  0.3-    200421 Z99  0.0   0.0     200426 703  0.0   0.7+
    200418 033  0.1-  0.3-    200421 Z99  0.1+  0.0     200426 703  0.3+  1.4+
    200418 H21  0.0   0.1+    200421 K87  0.0   0.5-    200426 703  0.7+  0.0
    200418 H21  0.1-  0.4+    200421 K87  0.0   0.1+    200428 I52  0.1-  0.1-
    200418 H21  0.1-  0.0     200421 K87  0.5-  1.2+    200428 I52  0.1+  0.5-
    200418 I52  0.2-  0.1-    200421 I52 (1.6+  0.5-)   200428 I52  0.5+  0.6+
    200418 I52  0.1-  0.1+    200421 I52  0.1-  0.1-    200428 I52  0.0   0.2-
    200418 I52  0.0   0.2-    200421 I52  0.1-  0.2+    200428 F51  0.2-  0.1+
    200418 I52  0.1-  0.2-    200421 T08  0.7+  0.1-    200428 F51  0.1+  0.0
    200418 K63  0.0   0.5+    200421 T08  0.2-  0.6+    200428 F51  0.1-  0.0
    200418 K63  0.6+  0.4-    200421 T08  0.4+  0.5+    200428 F51  0.3+  0.1-
    200418 K63  0.5+  0.1-    200421 T08  0.0   0.2-    200428 D29  1.5+  0.3+
    200419 204  0.1-  0.2+    200423 K87  0.2+  0.4-    200428 D29  0.7-  0.1+
    200419 204  0.0   0.0     200423 K87  0.3+  0.1-    200428 D29  0.1+  0.2-
    200419 204  0.1-  0.1+    200423 K87  0.6+  0.5+    200429 703  1.3-  0.1-
    200419 W34  0.5-  0.2+    200423 G96  0.1-  0.0     200429 703  0.1+  0.4+
    200419 W34  0.1+  0.2+    200423 G96  0.1+  0.1-    200429 703  1.0-  0.9-
    200419 W34  0.1+  0.2+    200423 G96  0.0   0.1-    210605 T12  0.1-  0.0
    200419 W34  0.7-  0.4-    200423 G96  0.4-  0.1+    210605 T12  0.0   0.0
    200419 850  0.7+  0.6+    200423 D29  0.5+  0.5+    210605 T12  0.0   0.0
    200419 850  0.1-  0.6+    200423 D29  0.3+  0.1+    210605 T12  0.0   0.0
    200419 V01  1.0-  0.1+    200423 D29  0.6-  0.0     210606 T12  0.1+  0.0
    200419 V01  0.1-  0.5+    200423 K87  0.2-  0.6-
    
    Ephemeris:
    2020 HY                  a,e,i = 0.90, 0.55, 18                  q = 0.4023
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
    2021 05 24    18 22 37.6 +15 26 28   0.5067  1.3943   130.2    33.7    23.7
    ...
    2021 06 08    17 36 01.4 +23 39 16   0.4698  1.3784   132.9    32.7    23.4
    ...
    2021 06 16    17 05 31.9 +26 33 16   0.4677  1.3621   129.5    35.1    23.5
    ...
    2021 06 22    16 42 31.3 +27 47 31   0.4733  1.3463   125.3    38.0    23.5
    2021 06 23    16 38 47.6 +27 55 12   0.4748  1.3433   124.5    38.6    23.6
    2021 06 24    16 35 06.6 +28 01 36   0.4763  1.3403   123.6    39.1    23.6
    ...
    2021 06 30    16 14 15.0 +28 14 37   0.4883  1.3203   118.3    42.7    23.7
    ...
    2021 07 08    15 50 40.3 +27 35 00   0.5090  1.2885   110.8    47.5    23.9
    ...
    2021 07 23    15 20 59.8 +24 33 26   0.5515  1.2130    96.9    56.2    24.2
    
    A. U. Tomatic                (C) Copyright 2021 MPC           M.P.E.C. 2021-M81
    


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