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  • MPEC 2009-H56 : COMET C/2001 D1 = 2004 X7 = 2008 S2 = 1997 J6 (SOHO)

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    M.P.E.C. 2009-H56                                Issued 2009 Apr. 26, 16:41 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
    
                 COMET C/2001 D1 = 2004 X7 = 2008 S2 = 1997 J6 (SOHO)
    
    Observations:
        CJ97J060 2S1997 05 01.91714 02 29 41.5  +14 25 15                   EH056249
        CJ97J060 2s1997 05 01.91714 2 +0.00509069 +0.00910385 +0.00338636   EH056249
        CJ97J060 2S1997 05 01.94901 02 30 21.4  +14 24 43                   EH056249
        CJ97J060 2s1997 05 01.94901 2 +0.00508838 +0.00910637 +0.00338662   EH056249
        CJ97J060 2S1997 05 01.98204 02 31 02.6  +14 24 25                   EH056249
        CJ97J060 2s1997 05 01.98204 2 +0.00508598 +0.00910897 +0.00338688   EH056249
    
    Observer details:
    249 SOHO.  SOHO-LASCO coronagraph C2.  Comet precovery by R. Kracht (following
        his 2001-2004-2008 identification on MPEC 2008-S82), measurements by
        K. Battams, reductions by B. G. Marsden.
    
    Orbital elements:
    Epoch 1997 Apr. 22.0 TT = JDT 2450560.5
    T 1997 May 1.66417 TT                                   MPC
    q   0.0493993            (2000.0)            P               Q
    n   0.25936030     Peri.  172.09884     +0.92664261     +0.36722066
    a   2.4351949      Node   165.54076     -0.36014730     +0.92853859
    e   0.9797144      Incl.   18.81136     -0.10783041     +0.05445256
    P   3.80
    
    Epoch 2001 Feb. 20.0 TT = JDT 2451960.5
    T 2001 Feb. 18.76966 TT                                 MPC
    q   0.0498142            (2000.0)            P               Q
    n   0.25917515     Peri.  172.09340     +0.92660154     +0.36737270
    a   2.4363545      Node   165.54137     -0.36021490     +0.92842538
    e   0.9795538      Incl.   18.75855     -0.10795748     +0.05535001
    P   3.80
    
    Epoch 2004 Dec. 21.0 TT = JDT 2453360.5
    T 2004 Dec. 7.82367 TT                                  MPC
    q   0.0469340            (2000.0)            P               Q
    n   0.26072193     Peri.  172.44783     +0.92705533     +0.36490711
    a   2.4267088      Node   165.23360     -0.35922487     +0.93025307
    e   0.9806594      Incl.   19.74060     -0.10735877     +0.03836705
    P   3.78
    
    Epoch 2008 Sept. 11.0 TT = JDT 2454720.5
    T 2008 Sept. 17.95601 TT                                MPC
    q   0.0466897            (2000.0)            P               Q
    n   0.26080569     Peri.  172.47655     +0.92716759     +0.36453259
    a   2.4261893      Node   165.22054     -0.35896467     +0.93044942
    e   0.9807559      Incl.   19.81280     -0.10725963     +0.03714659
    P   3.78
    Residuals in seconds of arc
    970501 249  4.1+  3.3+ Y  010218 249  0.8-  1.2+ Y  041207 249  4.4+  4.5- Y
    970501 249  2.0+  3.0- Y  010218 249  0.1-  2.4+ Y  041207 249 13.3-  3.2- Y
    970501 249  9.1-  0.1- Y  010218 249  2.5-  4.9+ Y  041207 249  0.5+  7.8- Y
    010218 249 (0.6- 32.8+)Y  010218 249 11.4-  6.0- Y  041207 249  2.3-  5.2+ Y
    010218 249 16.3+  1.8+ Y  010218 249 16.8- 10.1- Y  041207 249  7.4+ 10.4- Y
    010218 249 17.0+ 19.7+ Y  010218 249  3.2-  4.2- Y  041207 249 17.4-  6.3- Y
    010218 249(10.2+ 21.3-)Y  010218 249 13.0-  0.2- Y  041207 249  0.7+ 13.0- Y
    010218 249  9.0+ 17.4- Y  010218 249  5.0-  1.8+ Y  041207 249  9.0-  1.3- Y
    010218 249  8.8+ 10.4- Y  010218 249  3.7+  4.1- Y  041207 249  5.7-  5.6- Y
    010218 249  1.3+  3.4- Y  010218 249(26.0-  1.0-)Y  080917 249(25.6+  3.8-)Y
    010218 249  4.0+  7.7+ Y  010218 249  6.1-  9.8- Y  080917 249  3.4-  2.8+ Y
    010218 249  1.1-  3.3- Y  010218 249  1.9- 10.7- Y  080917 249(27.1+ 34.3+)Y
    010218 249 11.5+ 16.8+ Y  010218 249  3.7-  5.6+ Y  080917 249(31.3+  2.1-)Y
    010218 249  2.6+  4.9+ Y  010218 249 12.7-  8.8+ Y  080917 249(31.8+  5.3+)Y
    010218 249  0.3+  2.9+ Y  010218 249  4.3+  9.8- Y  080917 249 10.2+  1.4+ Y
    010218 249 11.5+ 10.1+ Y  010218 249(23.0-  2.8-)Y  080917 249  3.0+ 10.6+ Y
    010218 249 (8.6+ 21.1+)Y  010218 249  6.4+  3.8+ Y  080917 249(32.4+ 19.5+)Y
    010218 249  1.5-  7.3+ Y  010219 249 13.3-  5.0- Y  080918 249(22.5-  9.0+)Y
    010218 249  0.2+  6.5+ Y  041207 249(77.0- 45.4-)Y  080918 249  0.3-  2.2- Y
    010218 249 13.4-  2.3- Y  041207 249  5.7-  1.5+ Y  080918 249  1.3+  4.9+ Y
    010218 249  9.3-  7.8+ Y  041207 249(29.1- 13.4-)Y  080918 249  7.1-  9.4+ Y
    010218 249  7.4+ 13.1+ Y  041207 249  1.9- 11.2- Y  080918 249  7.3- 11.0- Y
    010218 249  2.2+  5.2+ Y  041207 249  9.0-  9.1- Y  080918 249  3.0+  5.9- Y
    010218 249 13.9+  7.6+ Y  041207 249  4.7+  1.8+ Y  080918 249  4.3+  2.2+ Y
    010218 249  4.6-  3.8+ Y  041207 249  0.9-  2.2+ Y  080918 249  8.9-  6.6+ Y
    
         The above computation, using nongravitational parameters A1 = +0.0002,
    A2 = -0.0002, is based on work by R. Kracht.  Despite the poor quality of the
    SOHO observations, a purely gravitational computation from the four
    apparitions appears to leave significantly systematic residuals.
    
    Brian G. Marsden             (C) Copyright 2009 MPC           M.P.E.C. 2009-H56
    

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