• MPC Preparation (Info)

  • MPEC 2021-W148 : 2021 WD4

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    M.P.E.C. 2021-W148                            Issued 2021 November 30, 13:17 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 WD4                                 
    
    
    Observations:
         K21W04D* C2021 11 28.36826002 23 40.008-06 14 39.52         20.95wUEW148F51
         K21W04D  C2021 11 28.37946602 23 37.706-06 13 45.48         21.13wUEW148F51
         K21W04D  C2021 11 28.39065602 23 35.431-06 12 51.38         21.14wUEW148F51
         K21W04D |C2021 11 29.05915 02 21 31.49 -05 18 14.8          21.4 GVEW148807
         K21W04D |C2021 11 29.06366 02 21 30.60 -05 17 53.4          21.4 GVEW148807
         K21W04D |C2021 11 29.06796 02 21 29.70 -05 17 31.9          21.4 GVEW148807
         K21W04D |C2021 11 30.04323 02 18 28.55 -03 57 08.6          21.2 GVEW148807
         K21W04D |C2021 11 30.04695 02 18 27.82 -03 56 50.1          21.1 GVEW148807
         K21W04D |C2021 11 30.05064 02 18 27.09 -03 56 31.6          21.2 GVEW148807
         K21W04D KC2021 11 30.10521402 18 16.84 -03 52 46.0          21.5 VuEW148H21
         K21W04D KC2021 11 30.10876402 18 16.12 -03 52 27.7          21.3 VuEW148H21
         K21W04D KC2021 11 30.11608102 18 14.67 -03 51 51.4          21.2 VuEW148H21
         K21W04D KC2021 11 30.31687 02 17 35.64 -03 34 58.5                oEW148691
         K21W04D KC2021 11 30.32520 02 17 34.03 -03 34 16.7                oEW148691
         K21W04D KC2021 11 30.33353 02 17 32.41 -03 33 35.0                oEW148691
    
    Observer details:
    691 Steward Observatory, Kitt Peak-Spacewatch.  Observer T. H. Bressi.  0.9-m
        f/3 reflector + CCD.
    807 Cerro Tololo Observatory, La Serena.  Observers T. Linder, R. Holmes, L.
        Horn.  1.00-m f/10.0 astrograph + CCD.
    F51 Pan-STARRS 1, Haleakala.  Observers J. Bulger, T. Lowe, A. Schultz, I.
        Smith.  Measurers K. Chambers, S. Chastel, T. de Boer, J. Fairlamb, H.
        Gao, M. Huber, C.-C. Lin, E. Magnier, Y. Ramanjooloo, R. Wainscoat, R.
        Weryk.  1.8-m Ritchey-Chretien + CCD.
    H21 Astronomical Research Observatory, Westfield.  Observer R. Holmes.
        Measurers T. Linder, R. Holmes, L. Horn.  0.81-m f/4.0 astrograph + CCD.
    
    Orbital elements:
    2021 WD4                                                 Earth MOID = 0.1416 AU
    Epoch 2022 Jan. 21.0 TT = JDT 2459600.5                 Veres                   
    M   2.65962              (2000.0)            P               Q                  
    n   0.58330746     Peri.   34.51044     -0.22363275     -0.92214011             
    a   1.4186362      Node    70.23483     +0.80148952     -0.35827721             
    e   0.2272293      Incl.   19.59862     +0.55461964     +0.14592829             
    P   1.69           H   23.04          G   0.15           U   8                  
    Residuals in seconds of arc
    211128 F51  0.1+  0.2-    211129 807  0.2-  0.3+    211130 H21  0.1+  0.2+
    211128 F51  0.1-  0.0     211130 807  0.1-  0.2-    211130 H21  0.0   0.2-
    211128 F51  0.0   0.2+    211130 807  0.0   0.2-    211130 691  0.4-  0.4+
    211129 807  0.0   0.4+    211130 807  0.1+  0.1-    211130 691  0.1-  0.2+
    211129 807  0.3+  0.3-    211130 H21  0.3+  0.4-    211130 691  0.1+  0.0
    
    Ephemeris:
    2021 WD4                 a,e,i = 1.42, 0.23, 20                  q = 1.0963
    Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
    2021 10 31    03 40 59.0 -27 07 07   0.3198  1.2381   134.5    34.9    22.5
    ...
    2021 11 15    03 05 17.5 -20 17 22   0.2494  1.1936   141.1    31.3    21.7
    ...
    2021 11 23    02 40 41.4 -12 50 25   0.2233  1.1722   142.3    31.0    21.5
    ...
    2021 11 29    02 21 42.0 -05 23 26   0.2111  1.1575   140.6    32.7    21.4
    2021 11 30    02 18 35.8 -04 01 07   0.2098  1.1551   140.1    33.2    21.4
    2021 12 01    02 15 31.8 -02 37 00   0.2087  1.1528   139.5    33.8    21.4
    ...
    2021 12 07    01 58 09.8 +06 14 03   0.2064  1.1398   134.6    38.0    21.4
    ...
    2021 12 15    01 38 58.8 +18 11 25   0.2148  1.1248   126.3    44.9    21.7
    ...
    2021 12 30    01 18 05.7 +37 04 48   0.2563  1.1047   111.9    55.7    22.3
    
    M. P. C. Staff               (C) Copyright 2021 MPC           M.P.E.C. 2021-W148
    


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