[Iaude] MPEC X169: 2021 XJ4 [a=2.22,e=0.73,i=7.0,H=27.3]

mpec at marsden.cfa.harvard.edu mpec at marsden.cfa.harvard.edu
Thu Dec 9 06:51:18 EST 2021


M.P.E.C. 2021-X169                             Issued 2021 December 9, 11:49 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 XJ4                                    


Observations:
     K21X04J* C2021 12 08.26242704 03 54.74 +25 16 04.7          20.68GVEX169G96
     K21X04J  C2021 12 08.26805004 03 44.79 +25 17 40.3          19.86GVEX169G96
     K21X04J  C2021 12 08.27928904 03 24.58 +25 20 53.9          20.70GVEX169G96
     K21X04J KC2021 12 09.12327903 26 28.31 +31 04 42.7          20.2 VuEX169H21
     K21X04J KC2021 12 09.12540503 26 19.24 +31 05 55.5          19.7 VuEX169H21
     K21X04J KC2021 12 09.12965803 26 01.02 +31 08 21.7          19.8 VuEX169H21
     K21X04J KC2021 12 09.13178303 25 51.86 +31 09 35.3          19.8 VuEX169H21
     K21X04J KC2021 12 09.13390903 25 42.72 +31 10 48.3          19.5 VuEX169H21
     K21X04J KC2021 12 09.13571803 25 34.90 +31 11 50.9          20.0 VuEX169H21
     K21X04J KC2021 12 09.16175203 23 51.97 +31 27 34.2          19.40GVEX169I52
     K21X04J KC2021 12 09.16253303 23 48.46 +31 28 02.2          19.46GVEX169I52
     K21X04J KC2021 12 09.16331503 23 44.96 +31 28 29.8          19.55GVEX169I52
     K21X04J KC2021 12 09.16409603 23 41.46 +31 28 57.9          19.49GVEX169I52
     K21X04J KC2021 12 09.18717103 21 40.99 +31 42 29.4          19.9 VZEX169W33
     K21X04J KC2021 12 09.19746103 20 53.00 +31 48 37.9          18.6 VZEX169W33
     K21X04J KC2021 12 09.20782403 20 03.99 +31 54 47.3          20.3 VZEX169W33

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.
W33 Transit Dreams Observatory, Campobello.  Observer D. Wilde.  0.36-m f/2
    Schmidt-Cassegrain + CCD.

Orbital elements:
2021 XJ4                                                 Earth MOID = 0.0071 AU
Epoch 2022 Jan. 21.0 TT = JDT 2459600.5                 Veres                   
M 359.07402              (2000.0)            P               Q                  
n   0.29878653     Peri.   88.20543     -0.94866515     -0.29389718             
a   2.2159606      Node    74.68981     +0.21988980     -0.87846584             
e   0.7254246      Incl.    6.95972     +0.22733874     -0.37672566             
P   3.30           H   27.32          G   0.15           U   8                  
Residuals in seconds of arc
211208 G96 (1.3-  0.8+)   211209 H21  0.2-  0.1+    211209 I52  0.1+  0.0
211208 G96  0.0   0.0     211209 H21  0.1-  0.1-    211209 W33  1.3-  0.0
211208 G96  0.1+  0.0     211209 H21  0.2+  0.1-    211209 W33  0.1+  1.6+
211209 H21  0.2-  0.1+    211209 I52  0.1+  0.0     211209 W33  0.9+  0.7-
211209 H21  0.2-  0.1-    211209 I52  0.0   0.1+
211209 H21  0.2-  0.1-    211209 I52  0.1-  0.2-

Ephemeris:
2021 XJ4                 a,e,i = 2.22, 0.73, 7                   q = 0.6084
Date    TT    R. A. (2000) Decl.     Delta      r    Elong.  Phase     V
2021 11 09    04 56 42.0 +14 30 49   0.4099  1.3635   150.9    20.7    27.1
...
2021 11 24    04 57 18.4 +14 55 46   0.2051  1.1865   164.8    12.6    25.0
...
2021 12 02    04 50 06.2 +16 27 43   0.1044  1.0897   173.1     6.2    23.1
...
2021 12 08    04 10 27.3 +24 08 05   0.03212 1.0167   168.9    10.7    20.6
2021 12 09    03 34 10.7 +29 59 18   0.02087 1.0045   158.9    20.6    19.9
2021 12 10    01 23 57.0 +42 04 33   0.01155 0.9923   130.2    49.3    19.5
...
2021 12 16    17 30 21.1 -07 22 49   0.06696 0.9200    15.9   162.9    33.4
...
2021 12 24    17 16 32.4 -11 05 07   0.1662  0.8266    17.6   159.0    33.6
...
2022 01 08    17 20 14.1 -13 50 09   0.3756  0.6777    28.6   136.1    30.7

M. P. C. Staff               (C) Copyright 2021 MPC           M.P.E.C. 2021-X169




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