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IAUC 6870: S/1997 U 1

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                                                  Circular No. 6870
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
Phone 617-495-7244/7440/7444 (for emergency use only)


S/1997 U 1
     Precovery and recovery observations of this satellite are reported:

               UT             R.A. (2000) Decl.       Observer
     1984 June  1.5556    16 40 58.4    -22 03 56     Cruikshank
                2.5410    16 40 48.5    -22 03 36       "
     1998 Mar. 27.79254   20 57 08.27   -17 56 16.2   Smith
               31.40380   20 57 41.27   -17 53 56.1   Hall

D. P. Cruikshank (Mauna Kea).  Measurer B. Gladman.  Images found on
   plates taken with the Canada-France-Hawaii Telescope; uncertainty +/- 3".
R. M. Smith, J. B. Jones and D. Windridge (Anglo-Australian Observatory).
   4-m reflector + CCD.  Measurer B. Gladman.
P. Hall and D. Graham (Cerro Tololo Interamerican Observatory).  4-m
   reflector + CCD.  Measurer J. J. Kavelaars.

      Orbit computations by G. V. Williams, K. Aksnes and the undersigned,
show that the 1998 recovery observations, although some 3' from the
prediction on IAUC 6833, confirm that this satellite has a low-e orbit
(see also IAUC 6780 and 6765).  They also clearly demonstrate the validity
of correctness the 1984 candidate, already noted by Gladman prior to the
1998 recovery, but not previously announced.

                    Epoch = 1998 July  6.0 TT
     T = 1998 Apr. 19.6463 TT         Peri. = 339.4621
     e = 0.082347                     Node  = 174.9928  2000.0
     q = 0.043975 AU                  Incl. = 139.6813
       a =  0.047921 AU    n = 0.621291     P =   579 days

1998 TT     R. A. (2000) Decl.     Delta     r_U   Elong.  dR.A.   dDecl.
Apr.  7    20 58.61    -17 50.0   20.243    0.044   65.0    329-    248-
     17    20 59.76    -17 45.0   20.082    0.044   74.5    328-    215-
     27    21 00.61    -17 41.2   19.913    0.044   84.1    322-    178-
May   7    21 01.14    -17 38.7   19.742    0.044   93.7    311-    138-
     17    21 01.35    -17 37.6   19.573    0.044  103.3    296-     95-
     27    21 01.23    -17 37.8   19.411    0.044  112.9    277-     49-
June  6    21 00.80    -17 39.4   19.261    0.045  122.6    253-      2-
     16    21 00.07    -17 42.1   19.127    0.045  132.3    225-     46+
     26    20 59.07    -17 45.9   19.013    0.045  142.1    194-     93+
July  6    20 57.86    -17 50.6   18.922    0.045  151.9    160-    139+
     16    20 56.47    -17 56.0   18.858    0.046  161.8    124-    184+
     26    20 54.96    -18 01.8   18.822    0.046  171.7     85-    226+

                      (C) Copyright 1998 CBAT
1998 April 7                   (6870)              Brian G. Marsden

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