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IAUC 5983: 1993 RO, 1993 RP, 1993 SB, 1993 SC

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IAUC number 

                                                  Circular No. 5983
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


1993 RO, 1993 RP, 1993 SB, 1993 SC
     D. J. Tholen provides precise positions of 1993 SC, measured by
M. Senay from CCD images obtained by Tholen with the 2.2-m reflector
at Mauna Kea.  The reduction was carried out with the help of
reference-star positions determined by O. Hainaut in the PPM system:

     1993 UT             R.A. (2000) Decl.
     Nov. 19.28252   23 50 47.10   - 0 33 12.1
          19.41519   23 50 46.82   - 0 33 13.5
          20.29771   23 50 44.98   - 0 33 24.5
          20.42730   23 50 44.71   - 0 33 26.1

     Computations by B. G. Marsden indicate that a circular orbit
like that on IAUC 5869 (a = 34 AU) is viable, but that perihelion
orbits with q = 34 to 33 AU and up to a = 44 AU can also fit.
Since the best fit corresponds to a = 39 AU, a plausible
assumption for assuring the object's orbital stability is that there is
a 2:3 resonance with Neptune, and the following perihelion
orbit maximizes the minimum distance Delta_N to Neptune at 14 AU:

     T = 1993 Sept. 17.795 TT        Peri. =   4.146
     e =  0.13812                    Node  = 354.646   2000.0
     q = 33.8512 AU                  Incl. =   5.159
       a =  39.2759 AU     n = 0.0040042     P = 246.1 years

The orbits of 1993 RO, RP and SB (IAUC 5865, 5867, 5869) can be
stabilized by the same mechanism, the perihelion orbits
below maximizing Delta_N at 13-15 AU.  More eccentric "Pluto-like"
stable solutions also exist.

     T = 1993 Sept. 14.160 TT        Peri. = 179.536
     e =  0.19335                    Node  = 170.313   2000.0
     q = 31.6854 AU                  Incl. =   3.647
       a =  39.2801 AU     n = 0.0040036     P = 246.2 years

     T = 1993 Sept. 15.301 TT        Peri. = 180.640
     e =  0.11355                    Node  = 192.090   2000.0
     q = 34.8632 AU                  Incl. =   2.570
       a =  39.3289 AU     n = 0.0039961     P = 246.6 years

     T = 1993 Sept. 16.790 TT        Peri. =   3.598
     e =  0.17630                    Node  = 354.745   2000.0
     q = 32.3874 AU                  Incl. =   1.893
       a =  39.3193 AU     n = 0.0039976     P = 246.6 years


1994 May 3                     (5983)              Brian G. Marsden

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