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    • MPEC 2023-B40 : S/2021 J 4

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    M.P.E.C. 2023-B40                              Issued 2023 January 19, 18:00 UT

     The Minor Planet Electronic Circulars contain information on unusual
         minor planets, routine data on comets and natural satellites,
         and occasional editorial announcements.  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

                               S/2021 J 4                                
                          Satellite of Jupiter                           


Observations:
    SK21J040* C2021 08 14.12967 21 54 13.144-13 38 36.32         24.2 rVEB040304
    SK21J040  C2021 08 14.13884 21 54 12.884-13 38 37.71         24.3 rVEB040304
    SK21J040 5C2021 09 05.46544 21 43 53.152-14 28 43.95         24.0 rVEB040568
    SK21J040 5C2021 09 06.44239 21 43 28.740-14 30 37.44         23.8 rVEB040568
    SK21J040 5C2021 09 06.45244 21 43 28.477-14 30 38.72         23.9 rVEB040568
    SK21J040  C2021 10 10.07403 21 35 10.709-15 05 25.63         24.3 rVEB040304
    SK21J040  C2021 10 11.04898 21 35 08.542-15 05 25.02         24.2 rVEB040304
    SK21J040  C2022 09 02.34356 00 24 25.671+00 33 53.92         24.1 rVEB040304
    SK21J040  C2022 09 02.35839 00 24 25.246+00 33 51.12         24.0 rVEB040304
    SK21J040  C2022 10 15.13851 00 02 17.540-01 59 45.94         23.9 rVEB040304
    SK21J040  C2022 10 15.14909 00 02 17.250-01 59 47.79         23.8 rVEB040304

Observer details:
304 Las Campanas Observatory.  Observer S. S. Sheppard.  6.5-m Magellan-Baade
    telescope + CCD.
568 Maunakea.  Observers S. S. Sheppard, D. J. Tholen, C. Trujillo.  Measurer
    S. S. Sheppard.  8.2-m reflector + CCD.

Orbital elements:
    S/2021 J 4                                                                  
Epoch 2023 Feb. 25.0 TT = JDT 2460000.5                 Alexandersen            
M 102.76481              (2000.0)            P               Q                  
n   0.50695184     Peri.  217.30730     +0.98586637     +0.00946395             
a   0.1533891      Node   218.88401     +0.10513305     -0.81229397             
e   0.1585459      Incl.  164.54657     -0.13043978     -0.58317145             
P   1.94           H   17.4           P/d   710.13                              
From 11 observations 2021 Aug. 14-2022 Oct. 15, mean residual 0".10             

Residuals in seconds of arc
210814 304  0.2-  0.0     210906 568  0.0   0.2-    220902 304  0.1-  0.1+
210814 304  0.0   0.0     211010 304  0.0   0.1+    221015 304  0.2-  0.0
210905 568  0.1+  0.0     211011 304  0.1-  0.1+    221015 304  0.1+  0.1+
210906 568  0.1+  0.0     220902 304  0.1+  0.1-


M. P. C. Staff               (C) Copyright 2023 MPC           M.P.E.C. 2023-B40

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