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IAUC 7460: S/1999 J 1

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                                                  Circular No. 7460
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


S/1999 J 1
     While examining measurements made by the University of Arizona's
Spacewatch program in fields selected by J. V. Scotti for discovering
outer satellites of Jupiter, T. B. Spahr, Center for Astrophysics,
identified evident prediscovery observations of the object for which
Spacewatch observations had been published on MPS 7418 under the designation
1999 UX18.  The slow motion and impossibility of fitting the observations
with a heliocentric orbit suggested that the object might be a jovian
satellite.  R. S. McMillan, J. A. Larsen, J. Montani, A. E. Gleason and
T. Gehrels were also involved with the observations and/or measurements.  An
unperturbed jovicentric solution by B. G. Marsden indeed proved the object to
be a satellite, and this was used by G. V. Williams, Center for Astrophysics,
to obtain the perturbed solution below.

     1999 UT             R.A. (2000) Decl.        V
     Oct.  6.36219    2 05 27.71   +12 28 47.8   19.9
           6.38353    2 05 27.22   +12 28 44.8   20.2
           6.40498    2 05 26.69   +12 28 41.9   20.5
          12.36523    2 02 57.27   +12 14 55.4   20.2
          12.40965    2 02 56.06   +12 14 49.6   20.7
          19.33318    1 59 49.99   +11 57 15.0   20.5
          19.35644    1 59 49.33   +11 57 11.3   20.7
          19.37792    1 59 48.71   +11 57 07.9   20.6
          30.33261    1 54 44.66   +11 27 38.6   21.2
          30.35371    1 54 44.08   +11 27 34.9   21.0
          30.37484    1 54 43.55   +11 27 31.5   20.7
     Nov.  4.36652    1 52 28.07   +11 14 03.0   20.8
           4.38952    1 52 27.39   +11 13 59.1   21.1
           4.41569    1 52 26.69   +11 13 54.9   20.7

                    Epoch = 2000 Sept.13.0 TT
     T = 2001 Sept. 4.042 TT          Peri. =  53.891
     e = 0.12971                      Node  = 280.375   2000.0
     q = 0.14134 AU                   Incl. = 143.026
       a =  0.16241 AU     n = 0.46530      P = 774 days

2000 TT     R. A. (2000) Decl.     Delta     r_J   Elong.  dR.A.   dDecl.
July 25     4 11.92    +19 26.8    5.640    0.184   57.8     16+   2892-
Aug.  4     4 18.24    +19 38.1    5.503    0.184   65.8    529-   3234-
     14     4 23.75    +19 46.3    5.355    0.184   74.1   1072-   3571-
     24     4 28.33    +19 51.7    5.200    0.184   82.6   1608-   3902-

                      (C) Copyright 2000 CBAT
2000 July 20                   (7460)              Brian G. Marsden

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