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  • MPEC 2021-H40 : 2021 HE

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    M.P.E.C. 2021-H40                                Issued 2021 April 18, 04:43 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 HE                                 
    
    
    Observations:
         K21H00E* C2021 04 16.33366812 01 55.056-22 11 05.27         20.47wUEH040F51
         K21H00E  C2021 04 16.34487812 01 55.165-22 10 06.62         20.49wUEH040F51
         K21H00E  C2021 04 16.35611012 01 55.274-22 09 07.41         20.45wUEH040F51
         K21H00E KC2021 04 16.57375012 02 00.30 -21 48 53.7          20.6 GVEH040474
         K21H00E KC2021 04 16.57552912 02 00.34 -21 48 43.8          20.4 GVEH040474
         K21H00E KC2021 04 16.57730712 02 00.37 -21 48 34.4          20.5 GVEH040474
         K21H00E KC2021 04 16.57908612 02 00.42 -21 48 24.3          20.1 GVEH040474
         K21H00E KC2021 04 16.58086412 02 00.45 -21 48 15.0          20.3 GVEH040474
         K21H00E KC2021 04 17.13196 12 02 23.48 -20 59 21.7                oEH040691
         K21H00E KC2021 04 17.14103 12 02 23.67 -20 58 31.4          20.1 RoEH040691
         K21H00E KC2021 04 17.14722 12 02 23.82 -20 57 57.5          20.2 RoEH040691
         K21H00E KC2021 04 17.27193012 02 25.80 -20 46 27.6          20.31GVEH040I52
         K21H00E KC2021 04 17.27311812 02 25.83 -20 46 20.4          19.96GVEH040I52
         K21H00E KC2021 04 17.27430812 02 25.84 -20 46 14.1          19.68GVEH040I52
         K21H00E  C2021 04 17.29461012 02 28.864-20 44 11.99         20.42wUEH040F52
         K21H00E  C2021 04 17.31525212 02 29.194-20 42 17.40         20.51wUEH040F52
         K21H00E  C2021 04 17.32545612 02 29.340-20 41 20.37         20.85wUEH040F52
         K21H00E KC2021 04 17.34765112 02 31.03 -20 38 16.5          20.4 GVEH040474
         K21H00E KC2021 04 17.34943112 02 31.07 -20 38 06.6          20.5 GVEH040474
         K21H00E KC2021 04 17.35121012 02 31.13 -20 37 56.9          20.6 GVEH040474
         K21H00E KC2021 04 17.35299012 02 31.17 -20 37 46.7          20.3 GVEH040474
         K21H00E  C2021 04 17.40440712 02 30.497-20 33 57.61         20.56wUEH040F51
         K21H00E  C2021 04 17.41600812 02 30.676-20 32 51.88         20.60wUEH040F51
         K21H00E  C2021 04 17.42763012 02 30.861-20 31 45.92         20.76wUEH040F51
         K21H00E  C2021 04 17.43923612 02 31.060-20 30 40.05         20.59wUEH040F51
         K21H00E KC2021 04 18.13142 12 03 02.05 -19 24 22.5          20.2 RoEH040691
         K21H00E KC2021 04 18.14827 12 03 02.42 -19 22 44.0          20.3 RoEH040691
         K21H00E KC2021 04 18.16514 12 03 02.84 -19 21 05.7          20.2 RoEH040691
    
    Observer details:
    474 Mount John Observatory, Lake Tekapo.  Observers A. C. Gilmore, P. M.
        Kilmartin.  Measurer P. M. Kilmartin.  1.0-m f/7.7 reflector + CCD.
    691 Steward Observatory, Kitt Peak-Spacewatch.  Observer T. H. Bressi.  0.9-m
        f/3 reflector + CCD.
    F51 Pan-STARRS 1, Haleakala.  Observers J. Bulger, T. Lowe, A. Schultz, M.
        Willman.  Measurers K. Chambers, S. Chastel, T. de Boer, L. Denneau, J.
        Fairlamb, H. Flewelling, M. Huber, C.-C. Lin, E. Magnier, Y. Ramanjooloo,
        R. Wainscoat, R. Weryk.  1.8-m Ritchey-Chretien + CCD.
    F52 Pan-STARRS 2, Haleakala.  Observers J. Bulger, T. Dukes, T. Lowe, A.
        Schultz, M. Willman.  Measurers K. Chambers, S. Chastel, T. de Boer, L.
        Denneau, J. Fairlamb, H. Flewelling, M. Huber, C.-C. Lin, E. Magnier, Y.
        Ramanjooloo, R. Wainscoat, R. Weryk.  1.8-m Ritchey-Chretien + CCD.
    I52 Steward Observatory, Mt. Lemmon Station.  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.  1.0-m reflector +
        CCD.
    
    Orbital elements:
    2021 HE                                                  Earth MOID = 0.0897 AU
    Epoch 2020 Dec. 17.0 TT = JDT 2459200.5                 Bell                    
    M 266.02162              (2000.0)            P               Q                  
    n   0.52744333     Peri.   49.07672     -0.15921066     +0.97308345             
    a   1.5171162      Node   212.90840     -0.97264855     -0.18352020             
    e   0.3271923      Incl.   17.85888     -0.16913533     +0.13938774             
    P   1.87           H   23.12          G   0.15           U   8                  
    Residuals in seconds of arc
    210416 F51  0.0   0.1+    210417 691  0.4+  0.0     210417 474  0.0   0.3+
    210416 F51  0.0   0.1-    210417 I52  0.1-  0.3-    210417 F51  0.0   0.0
    210416 F51  0.0   0.1+    210417 I52  0.1+  0.2+    210417 F51  0.0   0.1+
    210416 474  0.2-  0.3-    210417 I52  0.1-  0.1-    210417 F51  0.0   0.1+
    210416 474  0.1-  0.0     210417 F52  0.0   0.2-    210417 F51  0.1+  0.1+
    210416 474  0.2-  0.2-    210417 F52  0.1+  0.1-    210418 691  0.0   0.3-
    210416 474  0.0   0.2+    210417 F52  0.0   0.1+    210418 691  0.5-  0.1+
    210416 474  0.1-  0.1-    210417 474  0.2-  0.1+    210418 691  0.1-  0.1-
    210417 691  0.2-  0.8-    210417 474  0.2-  0.1+
    210417 691  0.0   0.1-    210417 474  0.1+  0.0
    
    Ephemeris:
    2021 HE                  a,e,i = 1.52, 0.33, 18                  q = 1.0207
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
    2021 03 19    12 03 33.0 -39 37 52   0.3520  1.2841   139.6    30.1    22.7
    ...
    2021 04 03    12 00 14.1 -35 02 42   0.2444  1.2142   148.1    25.8    21.7
    ...
    2021 04 11    12 00 06.6 -28 46 26   0.1954  1.1788   152.5    23.1    21.0
    ...
    2021 04 17    12 02 16.7 -21 10 53   0.1640  1.1536   154.2    22.3    20.6
    2021 04 18    12 02 54.5 -19 36 36   0.1593  1.1496   154.2    22.4    20.5
    2021 04 19    12 03 37.8 -17 56 30   0.1548  1.1455   154.0    22.6    20.4
    ...
    2021 04 25    12 10 06.0 -05 45 53   0.1325  1.1222   149.6    27.0    20.2
    ...
    2021 05 03    12 25 40.8 +15 32 58   0.1180  1.0939   134.5    41.1    20.3
    ...
    2021 05 18    13 24 40.4 +52 05 17   0.1412  1.0515   102.7    69.8    21.4
    
    M. P. C. Staff               (C) Copyright 2021 MPC           M.P.E.C. 2021-H40
    


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