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IAUC 5865: 1993 RO

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                                                  Circular No. 5865
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
     D. Jewitt, University of Hawaii; and J. Luu, Stanford University,
report their discovery of a third faint object with very slow (about
3"/hr) retrograde opposition motion.  The object, which appears
stellar in 0".8 seeing, was detected in CCD images obtained with the
University of Hawaii's 2.2-m telescope on Mauna Kea.

     1993 UT             R.A. (2000) Decl.         R
     Sept.14.3364    23 22 25.55   - 4 00 52.9    23
          14.5241    23 22 24.47   - 4 00 59.9
          15.4216    23 22 19.41   - 4 01 33.4
          15.4723    23 22 19.12   - 4 01 35.1
          16.4090    23 22 13.83   - 4 02 10.0
          16.4216    23 22 13.74   - 4 02 10.1
          17.4060    23 22 08.18   - 4 02 46.8
          17.4183    23 22 08.07   - 4 02 47.4

     Computations by the undersigned indicate that 1993 RO is
somewhat closer than the two earlier objects (1992 QB1 and 1993 FW).
The following is the direct circular orbit that represents the
observations, although direct and retrograde orbits of any
eccentricity (with shifts by up to some 10 AU in distance) will
represent them also.  It can be noted that the object is situated
about 60 degrees from Neptune.

 Epoch = 1993 Sept.10.00 TT       Arg.Lat.  = 179.31
                                      Node  = 170.51    2000.0
     a = 32.3231 AU                   Incl. =   2.53

1993 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      V
Aug. 21    23 24.66    - 3 46.2   31.385   32.323  157.6    0.7     23.2
     31    23 23.77    - 3 52.1   31.337   32.323  167.5    0.4     23.1
Sept.10    23 22.84    - 3 58.2   31.317   32.323  177.5    0.1     23.1
     20    23 21.89    - 4 04.4   31.327   32.323  172.5    0.2     23.1
     30    23 20.98    - 4 10.4   31.367   32.323  162.5    0.5     23.1
Oct. 10    23 20.12    - 4 16.0   31.435   32.323  152.4    0.8     23.2
     20    23 19.37    - 4 21.0   31.530   32.323  142.3    1.1     23.2
     30    23 18.74    - 4 25.1   31.649   32.323  132.1    1.3     23.2
Nov.  9    23 18.26    - 4 28.3   31.788   32.323  122.0    1.5     23.3


1993 September 18              (5865)              Brian G. Marsden

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