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  • MPEC 2021-J166 : 2021 JH4

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    M.P.E.C. 2021-J166                                 Issued 2021 May 11, 20:10 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
    
                                    2021 JH4                                 
    
    
    Observations:
         K21J04H* C2021 05 09.17895510 13 05.39 +03 02 43.3          21.04GVEJ166G96
         K21J04H  C2021 05 09.18412710 13 00.23 +03 02 14.3          20.30GVEJ166G96
         K21J04H  C2021 05 09.18930410 12 55.19 +03 01 46.1          20.69GVEJ166G96
         K21J04H  C2021 05 09.19447110 12 50.13 +03 01 17.1          20.57GVEJ166G96
         K21J04H KC2021 05 09.25223710 11 53.45 +02 55 54.4          20.04GVEJ166I52
         K21J04H KC2021 05 09.25322410 11 52.47 +02 55 47.9          21.13GVEJ166I52
         K21J04H KC2021 05 09.25421010 11 51.50 +02 55 42.8          21.30GVEJ166I52
         K21J04H KC2021 05 09.25519510 11 50.59 +02 55 37.2          21.01GVEJ166I52
         K21J04H KC2021 05 10.13603509 56 34.03 +01 21 16.3          20.61GVEJ166I52
         K21J04H KC2021 05 10.13751409 56 32.15 +01 21 05.4          20.47GVEJ166I52
         K21J04H KC2021 05 10.14046809 56 28.31 +01 20 42.5          20.17GVEJ166I52
         K21J04H KC2021 05 11.18504109 31 30.36 -01 13 00.8          19.94GVEJ166I52
         K21J04H KC2021 05 11.18602909 31 28.53 -01 13 11.9          19.89GVEJ166I52
         K21J04H KC2021 05 11.18701709 31 26.83 -01 13 22.1          19.80GVEJ166I52
         K21J04H KC2021 05 11.18800609 31 25.04 -01 13 32.6          20.07GVEJ166I52
    
    Observer details:
    G96 Mt. Lemmon Survey.  Observer H. Groeller.  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, T. A. Pruyne, D. Rankin, R. L.
        Seaman, F. C. Shelly, K. W. Wierzchos.  1.5-m reflector + 10K CCD.
    I52 Steward Observatory, Mt. Lemmon Station.  Observers G. J. Leonard, T. A.
        Pruyne.  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, T. A. Pruyne, D. Rankin, R. L. Seaman, F. C. Shelly, K. W.
        Wierzchos.  1.0-m reflector + CCD.
    
    Orbital elements:
    2021 JH4                                                 Earth MOID = 0.0065 AU
    Epoch 2020 Dec. 17.0 TT = JDT 2459200.5                 Pike                    
    M 321.41602              (2000.0)            P               Q                  
    n   0.23747618     Peri.  209.35177     -0.32809745     +0.94412835             
    a   2.5825932      Node    41.51674     -0.85725614     -0.28370681             
    e   0.6186289      Incl.    2.69832     -0.39681731     -0.16772629             
    P   4.15           H   25.64          G   0.15           U   9                  
    Residuals in seconds of arc
    210509 G96  0.4+  0.3+    210509 I52  0.3-  0.7-    210510 I52  0.1+  0.3-
    210509 G96  0.7-  0.2-    210509 I52  0.4-  0.3-    210511 I52  0.2+  0.4+
    210509 G96  0.2+  0.2+    210509 I52  0.3+  0.3-    210511 I52  0.6-  0.3-
    210509 G96  0.6+  0.1-    210510 I52  0.5-  0.8+    210511 I52  0.4+  0.2-
    210509 I52  0.0   0.2+    210510 I52  0.0   0.8+    210511 I52  0.1+  0.3-
    
    Ephemeris:
    2021 JH4                 a,e,i = 2.58, 0.62, 3                   q = 0.9849
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
    2021 04 11    11 47 23.3 +09 05 07   0.1864  1.1695   151.6    24.0    23.5
    ...
    2021 04 26    11 23 42.4 +09 10 39   0.1023  1.0775   132.2    43.8    22.5
    ...
    2021 05 04    10 58 06.1 +07 22 40   0.06000 1.0391   119.4    57.7    21.7
    ...
    2021 05 10    09 59 19.1 +01 40 13   0.02985 1.0163   101.9    76.5    20.7
    2021 05 11    09 36 48.7 -00 38 24   0.02532 1.0131    96.3    82.3    20.6
    2021 05 12    09 05 01.2 -03 53 24   0.02118 1.0100    88.8    90.0    20.5
    ...
    2021 05 18    02 36 10.2 -21 25 20   0.02274 0.9952    43.7   135.4    23.7
    ...
    2021 05 26    00 45 57.7 -15 49 34   0.06239 0.9856    62.4   114.4    24.0
    ...
    2021 06 10    00 20 38.1 -12 41 27   0.1401  0.9999    79.8    92.3    24.6
    
    M. P. C. Staff               (C) Copyright 2021 MPC           M.P.E.C. 2021-J166
    


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