• MPC Preparation (Info)

  • MPEC 2021-H45 : 2021 HJ

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    M.P.E.C. 2021-H45                                Issued 2021 April 18, 09:31 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 HJ                                 
    
    
    Observations:
         K21H00J* C2021 04 16.33366812 01 30.519-21 10 58.09         21.26wUEH045F51
         K21H00J  C2021 04 16.34487812 01 35.431-21 10 24.02         21.46wUEH045F51
         K21H00J  C2021 04 16.35611012 01 40.380-21 09 50.01         21.71wUEH045F51
         K21H00J KC2021 04 16.55774212 03 12.05 -20 58 07.9          21.3 GVEH045474
         K21H00J KC2021 04 16.56071812 03 13.37 -20 57 58.0          21.2 GVEH045474
         K21H00J KC2021 04 16.56369412 03 14.69 -20 57 49.2          21.5 GVEH045474
         K21H00J KC2021 04 17.20091212 08 10.19 -20 27 26.0          21.93GVEH045I52
         K21H00J KC2021 04 17.20628412 08 12.49 -20 27 10.5          20.91GVEH045I52
         K21H00J KC2021 04 17.21165712 08 14.80 -20 26 54.5          21.04GVEH045I52
         K21H00J KC2021 04 17.35947812 09 22.48 -20 17 53.0          21.5 GVEH045474
         K21H00J KC2021 04 17.36660512 09 25.48 -20 17 32.5          22.1 GVEH045474
         K21H00J KC2021 04 17.37373512 09 28.52 -20 17 12.3          22.0 GVEH045474
         K21H00J KC2021 04 18.26317 12 15 52.96 -19 35 01.1          21.5 RoEH045291
         K21H00J KC2021 04 18.27111 12 15 56.11 -19 34 37.8          22.2 RoEH045291
         K21H00J KC2021 04 18.27912 12 15 59.29 -19 34 14.1          21.9 RoEH045291
    
    Observer details:
    291 LPL/Spacewatch II.  Observer T. H. Bressi.  1.8-m f/2.7 reflector + CCD.
    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.
    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.
    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 HJ                                                  Earth MOID = 0.0809 AU
    Epoch 2020 Dec. 17.0 TT = JDT 2459200.5                 Bell                    
    M 323.71495              (2000.0)            P               Q                  
    n   0.44611684     Peri.  301.12294     -0.95198606     -0.29731998             
    a   1.6963038      Node   221.70478     +0.30469020     -0.89699436             
    e   0.3974274      Incl.    6.29619     +0.02977299     -0.32711153             
    P   2.21           H   25.29          G   0.15           U   8                  
    Residuals in seconds of arc
    210416 F51  0.2-  0.1-    210416 474  0.2+  0.0     210417 474  0.3-  0.3+
    210416 F51  0.2-  0.1+    210417 I52  0.5-  0.1-    210417 474  0.2-  0.3-
    210416 F51  0.4+  0.1+    210417 I52  0.0   0.5-    210418 291  0.1-  0.0
    210416 474  0.3+  0.2-    210417 I52  0.7+  0.4-    210418 291  0.0   0.0
    210416 474  0.2+  0.4+    210417 474  0.1+  0.5+    210418 291  0.2+  0.2+
    
    Ephemeris:
    2021 HJ                  a,e,i = 1.70, 0.40, 6                   q = 1.0221
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
    2021 03 19    07 06 02.6 -29 10 27   0.1055  1.0285   105.4    69.0    22.9
    ...
    2021 04 03    09 41 19.3 -30 53 25   0.08873 1.0581   129.2    47.1    21.9
    ...
    2021 04 11    11 13 22.9 -25 44 03   0.09585 1.0826   145.6    31.5    21.7
    ...
    2021 04 17    12 06 37.7 -20 36 29   0.1097  1.1044   155.3    22.3    21.8
    2021 04 18    12 14 00.5 -19 46 54   0.1126  1.1083   156.6    21.1    21.8
    2021 04 19    12 20 59.7 -18 58 34   0.1157  1.1123   157.7    20.0    21.8
    ...
    2021 04 25    12 55 39.0 -14 42 32   0.1375  1.1374   161.9    15.9    22.1
    ...
    2021 05 03    13 27 25.6 -10 38 13   0.1738  1.1742   161.6    15.7    22.7
    ...
    2021 05 18    14 03 36.3 -06 51 30   0.2608  1.2506   153.7    21.0    23.9
    
    M. P. C. Staff               (C) Copyright 2021 MPC           M.P.E.C. 2021-H45
    


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