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IAUC 6869: S/1997 U 2

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                                                  Circular No. 6869
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 2
     The recovery of the brighter of the new Uranian satellites is reported:

     1998 UT             R.A. (2000) Decl.       Observer
     Mar. 27.79632   20 57 59.99   -17 46 15.5   Smith
          31.40380   20 58 34.18   -17 44 03.4   Hall

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.

     These recovery positions are fully 30" from the prediction on IAUC
6834.  Computations by G. V. Williams, K. Aksnes and the undersigned
show that the reason for this is that there is another orbital solution
from the 1984-1997 observations, much more strongly perturbed by the sun,
separated from the sequence of solutions previously mentioned and
corresponding to N approximately 3.7.  The 1998 recovery clearly shows that
this high-e solution (see also IAUC 6780 and 6765) is the correct one.

                    Epoch = 1998 July  6.0 TT
     T = 1997 June 16.0390 TT         Peri. =  18.0055
     e = 0.509386                     Node  = 255.8085  2000.0
     q = 0.040055 AU                  Incl. = 152.6686
       a =  0.081643 AU    n = 0.279383     P =  1289 days

1998 TT     R. A. (2000) Decl.     Delta     r_U   Elong.  dR.A.   dDecl.
Apr.  7    20 59.52    -17 40.4   20.181    0.096   64.8    456+    327+
     17    21 00.72    -17 35.9   20.024    0.097   74.3    497+    331+
     27    21 01.61    -17 32.6   19.860    0.099   83.8    538+    335+
May   7    21 02.18    -17 30.8   19.693    0.100   93.4    577+    339+
     17    21 02.41    -17 30.4   19.528    0.102  103.0    615+    341+
     27    21 02.31    -17 31.3   19.370    0.103  112.6    652+    342+
June  6    21 01.89    -17 33.6   19.222    0.105  122.3    687+    342+
     16    21 01.17    -17 37.2   19.090    0.106  132.1    721+    340+
     26    21 00.18    -17 41.9   18.977    0.107  141.8    753+    338+
July  6    20 58.96    -17 47.4   18.888    0.108  151.7    783+    334+
     16    20 57.56    -17 53.6   18.824    0.109  161.6    811+    328+
     26    20 56.04    -18 00.2   18.788    0.111  171.5    836+    322+
Aug.  5    20 54.45    -18 07.0   18.781    0.112  178.4    860+    314+
     15    20 52.88    -18 13.6   18.804    0.113  168.6    881+    306+
     25    20 51.37    -18 19.7   18.855    0.114  158.6    900+    297+

                      (C) Copyright 1998 CBAT
1998 April 7                   (6869)              Brian G. Marsden

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