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  • MPEC 2021-C188 : 2021 CW4

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    M.P.E.C. 2021-C188                            Issued 2021 February 10, 20:43 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 CW4                                 
    
    
    Observations:
         K21C04W  C2021 02 07.10991 03 13 56.25 -21 56 13.7          19.2 GVEC188703
         K21C04W  C2021 02 07.11548 03 14 00.47 -21 56 03.2          19.0 GVEC188703
         K21C04W  C2021 02 07.12105 03 14 04.53 -21 55 54.2          19.1 GVEC188703
         K21C04W  C2021 02 07.12661 03 14 08.91 -21 55 44.1          18.2 GVEC188703
         K21C04W* C2021 02 10.27454303 55 01.42 -20 03 05.5          19.04cVEC188T08
         K21C04W  C2021 02 10.27777003 55 03.95 -20 02 57.3          19.18cVEC188T08
         K21C04W  C2021 02 10.28375803 55 08.47 -20 02 41.9          19.11cVEC188T08
         K21C04W  C2021 02 10.29575703 55 17.67 -20 02 11.3          18.99cVEC188T08
         K21C04W KC2021 02 10.76400 04 01 24.63 -19 42 16.7          18.8 GVEC188K74
         K21C04W KC2021 02 10.76970 04 01 29.04 -19 42 02.3          18.7 GVEC188K74
         K21C04W KC2021 02 10.77005504 01 29.74 -19 42 01.3          18.5 GVEC188J95
         K21C04W KC2021 02 10.77588 04 01 33.74 -19 41 45.4          18.2 GVEC188K74
         K21C04W KC2021 02 10.77734604 01 35.33 -19 41 42.1          18.5 GVEC188J95
         K21C04W KC2021 02 10.77950 04 01 36.50 -19 41 35.7          18.2 GVEC188K74
         K21C04W KC2021 02 10.78342004 01 39.96 -19 41 26.4          18.4 GVEC188J95
         K21C04W KC2021 02 10.78896104 01 44.19 -19 41 11.5          18.7 GVEC188J95
         K21C04W 4C2021 02 10.84114 04 02 24.62 -19 38 43.1          18.2 GVEC188J04
         K21C04W 4C2021 02 10.84141 04 02 24.81 -19 38 42.6          18.4 GVEC188J04
         K21C04W 4C2021 02 10.84167 04 02 25.02 -19 38 41.7          18.3 GVEC188J04
    
    Observer details:
    703 Catalina Sky Survey.  Observer R. A. Kowalski.  Measurers E. J.
        Christensen, B. Gray, D. Rankin, F. C. Shelly.  0.68-m Schmidt + 10K CCD.
    J04 ESA Optical Ground Station, Tenerife.  Observer D. Abreu.  Measurers A.
        Knofel, D. Koschny, M. Busch, M. Micheli, E. Schwab, R. Kresken.  1.0-m
        f/4.4 reflector + CCD.
    J95 Great Shefford.  Observer P. Birtwhistle.  0.41-m f/6.3 Schmidt-Cassegrain
        + CCD.
    K74 Muensterschwarzach Observatory, Schwarzach.  Observer C. Gerhard.  0.30-m
        f/3.75 Newtonian reflector + CCD.
    T08 ATLAS-MLO, Mauna Loa.  Observers L. Denneau, J. Tonry, A. Heinze, H.
        Weiland.  Measurers L. Denneau, J. Tonry, A. Heinze, H. Weiland, H.
        Flewelling, A. Fitzsimmons, J. Robinson, N. Erasmus.  0.5-m reflector +
        CCD.
    
    Orbital elements:
    2021 CW4                                            PHA, Earth MOID = 0.0365 AU
    Epoch 2020 Dec. 17.0 TT = JDT 2459200.5                 Veres
    M 355.14849              (2000.0)            P               Q
    n   0.42622839     Peri.  224.92019     +0.34704676     -0.93647608
    a   1.7486698      Node   204.90513     +0.89073545     +0.34605165
    e   0.5377755      Incl.    6.91567     +0.29351133     +0.05710348
    P   2.31           H   19.8           G   0.15           U   9
    Residuals in seconds of arc
    210207 703  0.0   0.1-    210210 T08  0.3+  0.5-    210210 J95  0.1-  0.2-
    210207 703  0.4+  0.6+    210210 K74  0.2-  0.2+    210210 J95  0.3-  0.0
    210207 703  1.5-  0.3-    210210 K74  0.5+  0.5-    210210 J04  0.2-  0.2+
    210207 703  1.1+  0.1-    210210 J95  0.2+  0.1+    210210 J04  0.4-  0.0
    210210 T08  0.5-  0.0     210210 K74  0.0   0.1+    210210 J04  0.2-  0.2+
    210210 T08  0.5+  0.1-    210210 J95  0.3+  0.1+
    210210 T08  0.2-  0.1-    210210 K74  0.1-  0.2+
    
    Ephemeris:
    2021 CW4                 a,e,i = 1.75, 0.54, 7                   q = 0.8083
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
    2021 01 11    23 23 28.3 -20 56 49   0.3430  0.8304    54.1   106.3    21.0
    ...
    2021 01 26    01 01 31.6 -23 28 42   0.2342  0.8994    62.2   104.5    20.3
    ...
    2021 02 03    02 23 10.0 -23 19 32   0.1953  0.9501    73.9    94.7    19.5
    ...
    2021 02 09    03 38 25.4 -20 53 08   0.1814  0.9926    86.6    82.9    19.0
    2021 02 10    03 51 27.6 -20 14 03   0.1807  1.0000    89.0    80.6    18.9
    2021 02 11    04 04 28.1 -19 31 05   0.1805  1.0074    91.3    78.4    18.8
    ...
    2021 02 17    05 18 26.1 -14 14 53   0.1894  1.0533   105.1    64.9    18.6
    ...
    2021 02 25    06 36 22.3 -06 53 28   0.2260  1.1172   119.1    50.7    18.7
    ...
    2021 03 12    08 04 16.8 +02 05 14   0.3456  1.2408   129.1    38.4    19.5
    
    M. P. C. Staff               (C) Copyright 2021 MPC           M.P.E.C. 2021-C188
    


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