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  • MPEC 1997-B19 : 1996 RQ20

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    M.P.E.C. 1997-B19                                Issued 1997 Jan. 30, 23:38 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.
    
                 BMARSDEN@CFA.HARVARD.EDU or GWILLIAMS@CFA.HARVARD.EDU
                     URL http://cfa-www.harvard.edu/cfa/ps/mpc.html
    
                                       1996 RQ20
    
                               Revision to MPEC 1996-S10
    
    Observations:
         J96R20Q  C1996 10 11.35505 00 41 04.20 +04 14 39.5          22.4 R      675
         J96R20Q  C1996 10 11.39858 00 41 03.97 +04 14 38.5                      675
         J96R20Q  C1996 10 11.43550 00 41 03.79 +04 14 37.6                      675
         J96R20Q  C1997 01 06.86736 00 37 21.12 +04 03 42.9                      950
         J96R20Q  C1997 01 08.87778 00 37 23.76 +04 04 16.8                      950
    
    Observer details:
    675 Palomar Mountain.  Observer A. Dressler.  Measurer D. L. Rabinowitz.
        Re-reduction by G. V. Williams (improving the positions on MPC 28172).
        5-m Hale reflector.
    950 La Palma.  Observers P. Magnusson, J. Warell.  Measurers M. Dahlgren,
        P. Magnusson.  2.5-m Nordic Optical Telescope.
    
    Orbital elements:
    1996 RQ20
    Epoch 1996 Nov. 13.0 TT = JDT 2450400.5                 Marsden
    M  41.69919              (2000.0)            P               Q
    n   0.00301867     Peri.  288.61349     +0.47369167     +0.87434282
    a  47.4161194      Node    11.53496     -0.46604176     +0.35055367
    e   0.2955333      Incl.   31.85970     -0.74727590     +0.33561400
    P 327              H    7.0           G   0.15           U   5
    From 24 observations 1996 Sept. 6-1997 Jan. 8, mean residual 0".42.
    
    Ephemeris:
    1996 RQ20                a,e,i = 47.42, 0.30, 32                 q = 33.403
    Date    TT    R. A. (2000) Decl.     Delta      r     Elong.  Phase     V
    1997 01 22    00 37.83   +04 08.9   39.921   39.567    68.3     1.3    23.2
    1997 02 01    00 38.34   +04 13.5   40.084   39.575    58.3     1.2    23.2
    1997 02 11    00 38.98   +04 19.0   40.232   39.582    48.3     1.1    23.2
    
         The above orbit is a general solution, the estimated uncertainty range
    in semimajor axis being 44 < a < 60 AU.  The earlier assumption of involvement
    with the Neptune 2:3 resonance must be discarded.  The minimum distance
    from Neptune (within 7000 years of the present) is 8 AU.  Involvement with the
    Neptune 1:2 resonance is possible.
    
    Brian G. Marsden             (C) Copyright 1997 MPC           M.P.E.C. 1997-B19
    

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