IAU Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 7525: S/1975 J 1 = S/2000 J 1

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).


Read IAUC 7524  SEARCH Read IAUC 7526

View IAUC 7525 in .dvi or .ps format.
IAUC number


                                                  Circular No. 7525
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


S/1975 J 1 = S/2000 J 1
     S. S. Sheppard, D. C. Jewitt, Y. Fernandez and G. Magnier, University
of Hawaii, have reported observations with the 2.2-m reflector during
Nov. 21-25 of what appeared to be a new satellite of Jupiter, to be
designated S/2000 J 1.  While attempting to compute an orbit, B. G. Marsden,
Center for Astrophysics (CfA), found a possible linkage to some observations
made by M. Holman, CfA (as part of the collaboration listed on IAUC 7512),
with the 3.6-m Canada-France-Hawaii telescope on Aug. 6 of what had also been
considered a possible satellite.  The resulting orbit was direct, but
substantially smaller and more inclined than those of the other direct, outer
satellites.  Selected observations follow:

     2000 UT             R.A. (2000) Decl.        R     Observer
     Aug.  6.56371    4 20 23.30   +20 57 04.1   20.5   Holman
     Nov. 21.50367    4 23 35.29   +20 41 36.5   21.5   Sheppard
          22.28860    4 23 05.01   +20 41 32.7   21.5     "
          23.26817    4 22 26.55   +20 41 26.9   21       "
          25.46439    4 20 59.01   +20 41 09.0            "

Marsden also suggested the possibility of identification with the lost
jovian satellite S/1975 J 1 observed by C. T. Kowal and E. Roemer (cf. IAUC
2845, 2855, 2899), this being proven by G. V. Williams, CfA, from the subarcmin
agreement of a backward integration of his perturbed 2000 orbit solution.  The
following perturbed orbital elements by Williams satisfy 23 observations
1975 Sept. 30-2000 Nov. 25 with a mean residual of 0".4:

                    Epoch = 2000 Sept.13.0 TT
     T = 2000 Oct. 13.8356 TT         Peri. = 238.1484
     e = 0.204340                     Node  = 202.3927  2000.0
     q = 0.039290 AU                  Incl. =  45.6723
       a =  0.049380 AU    n = 2.7754070    P = 129.71 days

2000/01     R. A. (2000) Decl.     Delta     r_J   Elong.  dR.A.   dDecl.
Nov. 22     4 23.27    +20 41.5    4.011    0.055  172.5   1736+    481+
Dec.  2     4 16.56    +20 39.4    4.004    0.058  175.8    917+   1116+
     12     4 09.86    +20 34.2    4.036    0.059  164.1     61-   1557+
     22     4 03.82    +20 26.2    4.106    0.059  152.5    996-   1750+
Jan.  1     3 59.00    +20 16.3    4.210    0.057  141.2   1724-   1682+
     11     3 55.80    +20 05.7    4.341    0.054  130.2   2120-   1367+
     21     3 54.46    +19 55.5    4.494    0.050  119.7   2098-    841+
     31     3 55.09    +19 47.1    4.658    0.045  109.6   1617-    177+

                      (C) Copyright 2000 CBAT
2000 November 25               (7525)              Brian G. Marsden

Read IAUC 7524  SEARCH Read IAUC 7526

View IAUC 7525 in .dvi or .ps format.


Our Web policy. Index to the CBAT/MPC/ICQ pages.


Valid HTML 4.01!