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  • MPEC 2008-K28 : 2006 HX122

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    M.P.E.C. 2008-K28                                Issued 2008 May 23, 18:51 UT
    
         The Minor Planet Electronic Circulars contain information on unusual
             minor planets and routine data on comets.  They are published
       on behalf of Commission 20 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 http://www.cfa.harvard.edu/iau/mpc.html  ISSN 1523-6714
    
                                      2006 HX122
    
                               Revision to MPEC 2006-L42
    
    Additional Observations:
         K06HC2X  C2007 06 16.01531 15 26 18.80 -22 20 32.1                 EK028304
         K06HC2X  C2007 06 16.08909 15 26 18.55 -22 20 30.7                 EK028304
         K06HC2X  C2007 07 16.07986 15 25 00.08 -22 13 19.9                 EK028568
    
    Observer details:
    304 Las Campanas Observatory.  Observers J. L. Elliot, E. Adams.  Measurer
        S. D. Kern.  Clay 6.5-m telescope + CCD.
    568 Mauna Kea.  Observer S. S. Sheppard.  Dupont 2.5-m reflector + CCD.
    
    First and last observations above in comparison with prediction:
    Residuals in seconds of arc and reference and Delta-T
    070616 304 25.4-  4.7+    070716 568 22.1-  3.2+    MPO111170
    
    Orbital elements:
    2006 HX122
    Epoch 2008 May 14.0 TT = JDT 2454600.5                  MPC
    M  35.34732              (2000.0)            P               Q
    n   0.00169365     Peri.  258.57523     -0.83534432     -0.50827994
    a  69.7034608      Node   250.56467     +0.54972599     -0.77160019
    e   0.4770554      Incl.   12.83010     +0.00109834     -0.38247176
    P 582              H    5.9           G   0.15           U   5
    Residuals in seconds of arc
    060427 807  0.1-  0.2-    060620 304  0.1-  0.1-    070616 304  0.0   0.1-
    060427 807  0.1-  0.3+    060821 807  0.1-  0.2+    070616 304  0.1+  0.1+
    060428 807  0.1+  0.1-    060822 807  0.3+  0.4+    070716 568  0.1-  0.0
    060620 304  0.0   0.2-    060823 807  0.1-  0.3-
    
    Ephemeris:
    2006 HX122               a,e,i = 69.70, 0.48, 13                 q = 36.451
    Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
    2008 05 14    15 32.67   -22 31.2   51.422   52.429   175.7     0.1    23.1
    2008 05 24    15 32.00   -22 28.5   51.437   52.441   172.3     0.1    23.1
    2008 06 03    15 31.34   -22 25.7   51.481   52.452   163.0     0.3    23.1
    2008 06 13    15 30.72   -22 23.0   51.553   52.463   153.4     0.5    23.2
    2008 06 23    15 30.17   -22 20.4   51.651   52.474   143.8     0.7    23.2
    2008 07 03    15 29.69   -22 18.0   51.772   52.485   134.2     0.8    23.2
    2008 07 13    15 29.32   -22 15.8   51.913   52.496   124.6     0.9    23.2
    2008 07 23    15 29.06   -22 14.0   52.070   52.508   115.0     1.0    23.2
    2008 08 02    15 28.92   -22 12.6   52.240   52.519   105.4     1.1    23.3
    2008 08 12    15 28.91   -22 11.6   52.417   52.530    95.8     1.1    23.3
    2008 08 22    15 29.03   -22 11.0   52.597   52.541    86.3     1.1    23.3
    2008 09 01    15 29.28   -22 10.9   52.776   52.552    76.7     1.1    23.3
    2008 09 11    15 29.65   -22 11.3   52.947   52.563    67.1     1.0    23.3
    2008 09 21    15 30.15   -22 12.1   53.108   52.575    57.5     0.9    23.3
    2008 10 01    15 30.75   -22 13.3   53.253   52.586    47.8     0.8    23.3
    2008 10 11    15 31.44   -22 15.0   53.378   52.597    38.1     0.7    23.3
    
         This apparent 2:7 Neptune librator remains more than 23 AU from Neptune
    over a 14 000-year period.
    
    Brian G. Marsden             (C) Copyright 2008 MPC           M.P.E.C. 2008-K28
    

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