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  • MPEC 2023-C10 : 2021 EF4

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    M.P.E.C. 2023-C10                              Issued 2023 February 1, 14:06 UT
    
         The Minor Planet Electronic Circulars contain information on unusual
             minor planets, routine data on comets and natural satellites,
             and occasional editorial announcements.  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
    
                                    2021 EF4                                 
    
    
                               Revision to MPEC 2021-E136                           
    
    Additional Observations:
         K21E04F  C2012 02 20.44095711 49 37.410+20 06 46.08         20.99GVEC010F51
         K21E04F  C2012 02 20.47137411 49 31.345+20 06 50.48         21.31GVEC010F51
         K21E04F  C2012 02 20.48670711 49 28.292+20 06 52.72         21.78GVEC010F51
         K21E04F 0C2023 01 24.65700513 59 15.109-15 24 59.71         22.64GVEC010T12
         K21E04F 0C2023 01 24.66144213 59 15.684-15 25 12.18         22.56GVEC010T12
         K21E04F 0C2023 01 24.66589013 59 16.259-15 25 24.52         22.88GVEC010T12
    
    Observer details:
    F51 Pan-STARRS 1, Haleakala.  Observers J. Bulger, K. Chambers, T. Lowe, A.
        Schultz, I. Smith.  Measurers S. Chastel, J. Fairlamb, M. Huber, Y.
        Ramanjooloo, R. Wainscoat, R. Weryk.  1.8-m Ritchey-Chretien + CCD.
    T12 University of Hawaii 88-inch telescope, Maunakea.  Observer D. Hung.
        Measurer D. J. Tholen.  2.24-m f/10.1 reflector + 2112 x 2112 pixels
        STA1600 10k CCD.
    
    First and last observations above in comparison with prediction:
    Residuals in seconds of arc (or two decimals in degrees), reference and Delta-T
    120220 F51 0.04+ 0.07+    230124 T12 0.02+ 0.02+    MPO624187   +0.03 days
    
    Orbital elements:
    2021 EF4                                                 Earth MOID = 0.2426 AU
    Epoch 2023 Feb. 25.0 TT = JDT 2460000.5                 Veres                   
    M 332.99962              (2000.0)            P               Q                  
    n   0.54592295     Peri.  312.38290     +0.52967775     +0.82663833             
    a   1.4826836      Node   345.38611     -0.36613097     +0.02073760             
    e   0.6972296      Incl.   48.86572     -0.76510757     +0.56235133             
    P   1.81           H   20.32          G   0.15           U   1                  
    Residuals in seconds of arc
    120220 F51  0.0   0.2-    210311 I52  0.2+  0.5+    210401 807  0.0   0.3-
    120220 F51  0.1-  0.1-    210311 I52  0.0   0.0     210402 807  0.1-  0.3-
    120220 F51  0.0   0.1+    210311 I52  0.1-  0.0     210402 V06  0.2-  0.2+
    210211 F52  0.1-  0.3-    210312 033  0.1-  0.0     210402 V06  0.1+  0.3-
    210211 F52  0.2+  0.6-    210312 033  0.4+  0.4-    210402 V06  0.5-  0.4-
    210211 F52  0.3+  0.2+    210312 L01  0.2+  0.4-    210407 G96  0.3+  0.3+
    210211 F52  0.1-  0.5-    210312 L01  0.5+  0.4-    210407 G96  0.1+  0.1+
    210212 F52  0.6-  0.1-    210312 L01  0.1+  0.3-    210417 807  0.0   0.2-
    210212 F52  0.2-  0.1-    210313 033  0.7-  0.6+    210417 807  0.1-  0.0
    210212 F52  0.0   0.4+    210313 033  0.5-  1.0+    210418 807  0.2-  0.1-
    210311 G96  0.2+  0.1+    210313 J04  0.1-  0.2-    230124 T12  0.0   0.0
    210311 G96  0.2-  0.2+    210313 J04  0.0   0.0     230124 T12  0.0   0.1-
    210311 G96  0.5-  0.3-    210313 J04  0.7+  0.2+    230124 T12  0.0   0.0
    210311 G96  0.2+  0.1+    210401 807  0.0   0.2-
    
    Ephemeris:
    2021 EF4                 a,e,i = 1.48, 0.70, 49                  q = 0.4489
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
    2023 01 02    13 18 33.2 -02 38 44   1.4013  1.5943    81.9    37.6    23.6
    ...
    2023 01 17    13 43 43.8 -10 09 34   1.0913  1.4506    88.6    42.7    23.0
    ...
    2023 01 25    14 00 00.9 -15 40 56   0.9322  1.3680    91.0    46.0    22.6
    ...
    2023 01 31    14 14 52.7 -20 56 07   0.8192  1.3030    92.0    49.1    22.3
    2023 02 01    14 17 41.4 -21 55 44   0.8011  1.2919    92.1    49.7    22.2
    2023 02 02    14 20 37.3 -22 57 39   0.7832  1.2808    92.1    50.2    22.2
    ...
    2023 02 08    14 41 32.3 -30 03 04   0.6827  1.2124    91.3    54.4    21.9
    ...
    2023 02 16    15 25 09.5 -42 11 03   0.5734  1.1169    87.1    62.0    21.6
    ...
    2023 03 03    19 18 52.2 -62 46 40   0.5028  0.9253    67.7    82.2    21.5
    
    A. U. Tomatic                (C) Copyright 2023 MPC           M.P.E.C. 2023-C10
    


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