[Iaude] MPEC X170: 2021 XK4 [a=1.01,e=0.30,i=10.9,H=26.3]

mpec at marsden.cfa.harvard.edu mpec at marsden.cfa.harvard.edu
Thu Dec 9 06:52:55 EST 2021


M.P.E.C. 2021-X170                             Issued 2021 December 9, 11:51 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 at CFA.HARVARD.EDU
            URL https://www.minorplanetcenter.net/    ISSN 1523-6714

                                    2021 XK4                                    


Observations:
     K21X04K* C2021 12 08.17257801 43 04.25 +28 15 52.6          20.34GVEX170G96
     K21X04K  C2021 12 08.17827501 43 07.83 +28 17 03.3          20.78GVEX170G96
     K21X04K  C2021 12 08.18399901 43 11.46 +28 18 12.9          21.39GVEX170G96
     K21X04K  C2021 12 08.18967301 43 15.00 +28 19 22.9          20.77GVEX170G96
     K21X04K KC2021 12 08.25768301 43 57.82 +28 32 58.7          20.68GVEX170I52
     K21X04K KC2021 12 08.25965301 43 59.09 +28 33 22.2          20.60GVEX170I52
     K21X04K KC2021 12 08.26162301 44 00.32 +28 33 45.3          20.66GVEX170I52
     K21X04K KC2021 12 08.26359201 44 01.58 +28 34 08.4          20.85GVEX170I52
     K21X04K KC2021 12 09.04080401 52 38.13 +30 52 19.4          21.0 VuEX170H21
     K21X04K KC2021 12 09.04639501 52 41.05 +30 53 13.5                uEX170H21
     K21X04K KC2021 12 09.04925001 52 42.56 +30 53 40.5                uEX170H21
     K21X04K KC2021 12 09.06037401 52 48.40 +30 55 27.2          21.3 VuEX170H21
     K21X04K KC2021 12 09.06836801 52 57.51 +30 56 52.9          21.25GVEX170I52
     K21X04K KC2021 12 09.07004701 52 58.43 +30 57 09.1          20.76GVEX170I52
     K21X04K KC2021 12 09.07172501 52 59.24 +30 57 25.2          21.02GVEX170I52
     K21X04K KC2021 12 09.07340401 53 00.11 +30 57 41.8          20.85GVEX170I52

Observer details:
G96 Mt. Lemmon Survey.  Observer R. A. Kowalski.  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, D. Rankin, R. L. Seaman, F. C.
    Shelly, K. W. Wierzchos.  1.5-m reflector + 10K CCD.
H21 Astronomical Research Observatory, Westfield.  Observer R. Holmes.
    Measurers T. Linder, R. Holmes, L. Horn.  0.76-m f/3.0 astrograph + 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, D. Rankin, R. L.
    Seaman, F. C. Shelly, K. W. Wierzchos.

Orbital elements:
2021 XK4                                                 Earth MOID = 0.0049 AU
Epoch 2022 Jan. 21.0 TT = JDT 2459600.5                 Veres                   
M 116.34451              (2000.0)            P               Q                  
n   0.97386484     Peri.  254.71846     +0.81335035     +0.55354625             
a   1.0080226      Node    71.36092     -0.43440698     +0.78253602             
e   0.3025425      Incl.   10.89023     -0.38697775     +0.28499810             
P   1.01           H   26.37          G   0.15           U   8                  
Residuals in seconds of arc
211208 G96  0.0   0.0     211208 I52  0.0   0.0     211209 I52  0.3+  0.0
211208 G96  0.1-  0.4+    211208 I52  0.2+  0.1+    211209 I52  0.7+  0.1-
211208 G96  0.2+  0.5-    211209 H21  0.4-  0.3+    211209 I52  0.2-  0.2-
211208 G96  0.2-  0.0     211209 H21  0.6-  0.4+    211209 I52  0.2-  0.0
211208 I52  0.1-  0.3-    211209 H21  0.4-  0.1-
211208 I52  0.2+  0.1+    211209 H21  0.0   0.1-

Ephemeris:
2021 XK4                 a,e,i = 1.01, 0.30, 11                  q = 0.7031
Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
2021 11 09    15 42 12.0 -48 13 51   0.1650  0.8567    32.8   141.2    29.1
...
2021 11 24    16 42 05.7 -55 03 02   0.06161 0.9379    35.6   142.3    27.3
...
2021 12 02    22 16 52.3 -40 11 11   0.01809 0.9809    73.2   105.7    21.5
...
2021 12 08    01 40 57.3 +27 39 18   0.03784 1.0124   135.3    43.1    21.0
2021 12 09    01 52 08.5 +30 46 18   0.04388 1.0175   137.0    41.3    21.2
2021 12 10    02 01 11.2 +33 05 05   0.05009 1.0227   138.1    40.1    21.5
...
2021 12 16    02 33 01.7 +39 38 18   0.08906 1.0527   138.7    38.1    22.8
...
2021 12 24    02 54 23.7 +42 18 32   0.1434  1.0908   135.7    39.0    23.9
...
2022 01 08    03 22 54.0 +43 27 24   0.2513  1.1552   128.0    42.1    25.3

M. P. C. Staff               (C) Copyright 2021 MPC           M.P.E.C. 2021-X170




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