• MPC Preparation (Info)

    • MPEC 2021-G121 : 2021 GW4

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    M.P.E.C. 2021-G121                                Issued 2021 April 9, 15:22 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 GW4                                 


Observations:
     K21G04W* C2021 04 08.23091110 32 44.62 +05 40 55.2          21.80GVEG121G96
     K21G04W  C2021 04 08.23606510 32 43.67 +05 40 57.6          21.72GVEG121G96
     K21G04W  C2021 04 08.24122310 32 42.73 +05 41 00.8          22.13GVEG121G96
     K21G04W  C2021 04 08.24637110 32 41.81 +05 41 03.7          22.04GVEG121G96
     K21G04W KC2021 04 08.32522610 32 29.04 +05 41 38.8          22.08GVEG121I52
     K21G04W KC2021 04 08.32942710 32 28.48 +05 41 41.4          21.39GVEG121I52
     K21G04W KC2021 04 08.33362710 32 27.97 +05 41 42.8                VEG121I52
     K21G04W  C2021 04 09.19586410 33 09.30 +05 53 02.5          21.35GVEG121G96
     K21G04W  C2021 04 09.20256410 33 07.69 +05 53 09.1          20.97GVEG121G96
     K21G04W  C2021 04 09.20970610 33 06.09 +05 53 15.5          21.26GVEG121G96
     K21G04W  C2021 04 09.21684710 33 04.41 +05 53 22.3          21.27GVEG121G96
     K21G04W  C2021 04 09.30947710 33 16.194+05 57 14.50         21.34wUEG121F51
     K21G04W  C2021 04 09.32253010 33 12.796+05 57 28.66         21.30wUEG121F51
     K21G04W  C2021 04 09.33556110 33 09.372+05 57 42.48         21.26wUEG121F51
     K21G04W  C2021 04 09.34865310 33 05.917+05 57 55.97         21.01wUEG121F51

Observer details:
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.
G96 Mt. Lemmon Survey.  Observer G. J. Leonard.  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.  Observer D. Rankin.  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 GW4                                                 Earth MOID = 0.0001 AU
Epoch 2020 Dec. 17.0 TT = JDT 2459200.5                 Veres                   
M 286.43024              (2000.0)            P               Q                  
n   0.53138060     Peri.   26.55994     -0.66804137     +0.74410920             
a   1.5096129      Node   201.52503     -0.68498576     -0.61741267             
e   0.3526178      Incl.    0.73629     -0.29071504     -0.25515309             
P   1.85           H   29.41          G   0.15           U   8                  
Residuals in seconds of arc
210408 G96  0.1+  0.2+    210408 I52  0.1-  0.1+    210409 G96 (1.0-  0.0+)
210408 G96  0.1-  0.2-    210408 I52  0.5+  0.2-    210409 F51  0.0-  0.0+
210408 G96  0.0+  0.3+    210409 G96  0.7+  0.0+    210409 F51  0.0+  0.0-
210408 G96  0.1+  0.6+    210409 G96  0.7-  0.2+    210409 F51  0.1+  0.0-
210408 I52  0.1-  0.8-    210409 G96  0.2-  0.1-    210409 F51  0.0-  0.0-

Ephemeris:
2021 GW4                 a,e,i = 1.51, 0.35, 1                   q = 0.9773
Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
2021 03 10    10 44 00.0 +04 18 10   0.1308  1.1224   170.8     8.1    25.8
...
2021 03 25    10 36 04.0 +04 52 28   0.06880 1.0596   154.3    24.1    24.9
...
2021 04 02    10 33 19.6 +05 12 58   0.03876 1.0317   145.7    33.1    23.8
...
2021 04 08    10 32 47.9 +05 42 40   0.01676 1.0140   139.5    39.9    22.1
2021 04 09    10 33 03.5 +05 55 04   0.01311 1.0114   138.5    41.0    21.6
2021 04 10    10 33 39.4 +06 16 27   0.0094591.0088   137.6    42.1    20.9
...
2021 04 16    23 36 08.7 -32 25 07   0.01276 0.9956    51.2   128.2    25.5
...
2021 04 24    23 39 09.4 -32 41 07   0.04183 0.9838    57.4   120.5    27.4
...
2021 05 09    23 46 36.2 -31 20 22   0.09557 0.9774    67.8   107.0    28.3

M. P. C. Staff               (C) Copyright 2021 MPC           M.P.E.C. 2021-G121

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