Objects In This Ephemeris -------------------------------------------------------- Name Id-code ------------- ------- SUN.........................10 MOON.......................301 EARTH......................399 EARTH-MOON_BARYCENTER........3 JUPITER....................599 AMALTHEA...................505 THEBE......................514 ADRASTEA...................515 METIS......................516 JUPITER_BARYCENTER...........5 Approximate Time Coverage From: 1996 JAN 01 00:00:00.000 (TDB) To : 2010 JAN 01 00:00:00.000 (TDB) Status -------------------------------------------------------- This is the current best estimate for the positions of minor Jovian satellites Amalthea, Thebe, Adrastea, and Metis of 1 May 2000. Currently, no formal updates to this ephemeris are planned. However, if you need a more recent ephemeris and have reason to believe that observations following the creation date of this ephemeris may significantly improve the positional knowledge for the objects in this ephemeris, we recommend that you contact NAIF and to the extent that resources are available we will attempt to provide an update to this ephemeris. Production/History of this Ephemeris -------------------------------------------------------- This ephemeris was produced by Bill Taber of the Navigation Ancillary Information Facility (NAIF) at the Jet Propulsion Laboratory on 1 May 2000. The file is the result of merging several SPK files to produce this file. The ephemerides of the Earth, Moon, Sun, the Earth-Moon Barycenter and the Jupiter System Barycenter are taken from the JPL planetary ephemeris DE403. The ephemeris of Jupiter relative to the Jupiter System Barycenter is taken from the satellite ephemeris JUP100. The ephemerides of the minor satellites were generated using equinoctial elements provided to NAIF by Bob Jacobson of the Solar System Dynamics group of the Navigatio and Mission Design Section (section 312) at JPL. The source information for these satellites is given below. Rock Element File: JUP120 File location: murphy:/home6/raj/Satellite/Jupiter/Rocks/Data/rckin.jup120.txt Equinox Reference Julian Date: 2433282.50 Bodies on the File: Name Number GM AX BX CX Amalth 505 0.000000000000000E+00 0.000 0.000 0.000 Thebe 514 0.000000000000000E+00 0.000 0.000 0.000 Adrast 515 0.000000000000000E+00 0.000 0.000 0.000 Metis 516 0.000000000000000E+00 0.000 0.000 0.000 Elements for Amalth at Julian Date: 2443937.5 Semi-major axis 181365.5740000000 km h = esin(omega+node) 1.587645954267409E-03 k = ecos(omega+node) 1.552244023298938E-03 mean longitude 192.1372102903389 deg p = tan(i/2)sin(node) -3.128018101423140E-03 q = tan(i/2)cos(node) -6.423987906190262E-04 apsidal rate 2.908806783226840E-05 deg/sec mean longitude rate 8.363793061627021E-03 deg/sec nodal rate -2.898948153780610E-05 deg/sec Reference plane pole RTA 268.0010000000000 deg Reference plane pole DEC 64.50400000000000 deg Elements for Thebe at Julian Date: 2443937.81706 Semi-major axis 221888.3060000000 km h = esin(omega+node) -1.419537460521504E-02 k = ecos(omega+node) 1.034388248292504E-02 mean longitude 312.9376941182270 deg p = tan(i/2)sin(node) 3.912942488862052E-03 q = tan(i/2)cos(node) 8.712631346753990E-03 apsidal rate 1.433400739278653E-05 deg/sec mean longitude rate 6.177086323833784E-03 deg/sec nodal rate -1.430904354449910E-05 deg/sec Reference plane pole RTA 268.0010000000000 deg Reference plane pole DEC 64.50400000000000 deg Elements for Adrast at Julian Date: 2443935.5492707 Semi-major axis 128979.9080000000 km h = esin(omega+node) 0. k = ecos(omega+node) 0. mean longitude 295.3473641017194 deg p = tan(i/2)sin(node) 0. q = tan(i/2)cos(node) 0. apsidal rate 9.727101238555177E-05 deg/sec mean longitude rate 1.396989439740030E-02 deg/sec nodal rate -9.660246625153272E-05 deg/sec Reference plane pole RTA 268.0010000000000 deg Reference plane pole DEC 64.50400000000000 deg Elements for Metis at Julian Date: 2450392.938090278 Semi-major axis 127978.8680000000 km h = esin(omega+node) 0. k = ecos(omega+node) 0. mean longitude 84.23908805165286 deg p = tan(i/2)sin(node) 0. q = tan(i/2)cos(node) 0. apsidal rate 1.000079083666271E-04 deg/sec mean longitude rate 1.413489180972219E-02 deg/sec nodal rate -9.930964475521999E-05 deg/sec Reference plane pole RTA 268.0010000000000 deg Reference plane pole DEC 64.50400000000000 deg Ephemeris Accuracy (km,sec) - 1 sigma: Name Radial Downtrack Normal Period Amalthea 250.000 600.000 150.000 0.000300 Thebe 400.000 800.000 150.000 0.001800 Adrastea 400.000 1200.000 500.000 0.002100 Metis 400.000 800.000 500.000 0.001200 Chebyshev interpolation error: 250.0 meters Release to: Galileo Project Date: 16-SEP-1997 Release to: Horizons/NAIF Date: 19-MAY-1998 09:41:15 Preparer: R.A. Jacobson Comments: Element file for Jovian rocks fit to Earthbased, Voyager, and Galileo observations. Usage -------------------------------------------------------- This ephemeris is intended to extend the ephemeris "jup120.bsp" previously distributed by NAIF. It is expected that for most purposes this ephemeris will replaces the that ephemeris. If you need states of other Jovian satellites, we recommend that you contact NAIF to obtain jup100.bsp. If you need ephemerides for planets other than Earth, Jupiter, the Sun and Moon, we recommend using "de403s.bsp". For other uses contact NAIF to obtain suitable ephemerides. Inquiries If you have any questions regarding this ephemeris contact Bill Taber btaber@spice.jpl.nasa.gov Phone (818) 354-4279 FAX (818) 393-6388 JPL MS 301/125L 4800 Oak Grove Drive Pasadena, CA 91109