Data Set Information
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| DATA_SET_NAME |
GO JUP POS GLL TRAJECTORY MOON CENTERED COORDS V1.0
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| DATA_SET_ID |
GO-J-POS-6-SC-TRAJ-MOON-COORDS-V1.0
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| NSSDC_DATA_SET_ID |
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| DATA_SET_TERSE_DESCRIPTION |
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| DATA_SET_DESCRIPTION |
Overview:=========This data set contains Galileo trajectory data in moon (Amalthea, Io,Europa, Ganymede, Callisto) centered coordinates for all of the nearsatellite encounters. Ephemeris data are provided every two seconds forapproximately one hour about closest approach.Coordinates:============Two coordinate systems are provided: SPRH (Satellite centered planetocentric, right-handed), PhiO (Satellite centered inertial Phi-Omega coordinates),Distances from the satellites are measured in satellite radii. The radiivalues used for the various satellites are listed in Table 1. Table 1: Satellite Radii --------------------------- Moon Radius --------------------------- Amalthea 86.2 Io 1818 Europa 1560 Ganymede 2634 Callisto 2409Satellite centered coordinate systems names are preceded by the firstletter in the name of the satellite, in order to indicate which satelliteis used as the center. In order words, PhiO coordinates are called EPhiOat Europa and CPhiO at Callisto.SPRH (Satellite centered planetocentric, right-handed)This coordinate system is the basic J2000 definition of planetocentriccoordinates, as applied to each of the satellites. In it's Cartesianform the coordinate system has its Z-axis along the satellite axis ofrotation positive in the direction of angular momentum, the X-axis in theequatorial plane in the direction of the prime meridian, with theY-axis completing the right-handed set. The coordinate system rotates withthe satellite (body-fixed).All of the SPRH data in this data set are based on the InternationalAstronomical Union (IAU) definitions of the satellite axes orientationsand rotation rates from the Report of the IAU/IAG/COSPAR Working Group onCartographic Coordinates and Rotational Elements of the Planets andSatellites: 1994 [IAU1994]. The specific orbit elements for eachsatellite are summarized in Table 2.Table 2: Approximate Satellite axes orientations in J2000 Coordinates*--------------------------------------------------------------------- Right Prime Meridian**Satellite Ascension Declination Const Rate--------------------------------------------------------------------Amalthea 268.05 +64.49 231.67 +722.6314560Io 268.05 +64.50 200.39 +203.4889538Europa 268.08 +64.51 35.67 +101.3747235Ganymede 268.20 +64.57 44.04 +50.3176081Callisto 268.72 +64.83 259.73 +21.5710715* Precise definitions include drift rate and nutation corrections** PM = const + rate*d where d is days after the J2000 epoch.PhiO (Satellite centered inertial Phi-Omega coordinates)The basis vectors of the inertial Phi-Omega coordinate systems aredefined at an epoch time that is set at the time of spacecraft closestapproach to the satellite. The X-direction is defined to be in thedirection of corotation, at the center of the satellite at the epochtime (System III Phi direction [DESSLER1983]). The Z-axis is definedto be orthogonal to the X direction such that the X-Z plane containsthe Jupiter spin axis (Omega), positive in the direction of angularmomentum. The Y-axis is defined to complete the right-handed set.Since the jovian satellites all lie very close to the jovian equatorialplane, it is often convenient to visualize this coordinate system asfollows: X lies in the direction of plasma flow, Y points towardsJupiter, and Z points 'up'.In this data set, the instantaneous satellite-spacecraft range vectoris resolved into the Cartesian components of the coordinate systemdescribed in the previous paragraph. Table 3 gives the satellite closestapproach times (epoch times) and other useful parameters. Oneparticularly useful parameter is the angle (Theta) that the backgroundmagnetic field makes with respect to the Z-axis, when projected into theY-Z plane. The PhiO coordinate system can be rotated about the X-axis bythis angle to produce the PhiB coordinate system that has been usedextensively in the analysis of the magnetic field data.Table 3: Satellite Encounter Parameters======================================================================== SPRH values at C/A -------------------Moon Orbit C/A Time Alt.* Lat. E.Lon. Local Theta UT time ----+----+-------------------------------------------------------------Ama 34 2002-11-05T06:18:40 163 -47.7 74.8 21:58Io 00 1995-12-07T17:45:58 901 -9.56 258.9 11:50 -3Io 24 1999-10-11T04:33:03 615 4.51 135.9 10:42 15Io 25 1999-11-26T04:05:22 309 -76.39 315.8 10:13 ***Io 27 2000-02-22T13:46:41 2013 -18.96 92.4 08:55 15Io 31 2001-08-06T04:59:21 197 77.51 187.7 04:19Io 32 2001-10-16T01:23:21 182 -78.60 135.3 05:03Io 33 2002-01-17T14:08:28 163 -43.50 41.8 01:18 ***Io** 34 2002-11-05R02:56:49 26.0 -6.30 ***Eur** 03 1996-11-06T18:49:51 23.3 0.69 ***Eur 04 1996-12-19T06:52:58 697 -1.65 34.7 12:59 -23Eur 06 1997-02-20T17:06:10 591 -17.02 270.4 19:44 ***Eur** 07 1997-04-04T05:58:47 16.7 2.1 ***Eur 11 1997-11-06T20:31:44 2048 25.73 218.7 10:57 -25Eur 12 1997-12-16T12:03:20 206 -8.66 134.4 14:39 -4Eur 14 1998-03-29T13:21:05 1649 12.20 131.2 14:25 -28Eur 15 1998-05-31T21:21:56 2520 15.01 225.4 10:04 27Eur 16 1998-07-21T05:04:43 1840 -25.61 133.6 13:49 ***Eur 17 1998-09-26T03:54:20 3587 -42.43 220.3 09:55 -16Eur 18 1998-11-22T11:44:56 2276 41.71 139.3 13:04 ***Eur 19 1999-02-01T02:19:50 1444 30.52 28.2 09:51 -10Eur** 25 1999-11-25T16:29:05 5.5 62.31 266.0 09:29Eur 26 2000-01-03T17:59:43 348 -47.09 157.4 08:55 29Gan 01 1996-06-27T06:29:07 835 30.41 246.7 11:50 -45Gan 02 1996-09-06T18:59:34 261 79.30 236.4 10:47 -40Gan 07 1997-04-05T07:09:58 3102 55.79 270.4 19:44 48Gan 08 1997-05-07T15:56:10 1603 28.27 84.8 08:07 -4.5Gan** 09 1997-06-26T17:19:35 30.3 -0.02 261.2 08:02Gan** 12 1997-12-15T09:58:09 5.5 -5.81 266.1 06:45Gan 28 2000-05-20T10:10:10 809 -18.96 92.4 00:47 45Gan 29 2000-12-28T08:25:27 2338 62.21 269.0 23:54 -46Cal 03 1996-11-04T13:34:28 261 79.30 246.7 07:48 -71Cal 09 1997-06-25T13:47:50 1603 1.96 84.8 05:32 72Cal 10 1997-09-17T00:18:55 529 4.60 281.3 05:02 69Cal 20 1999-05-05T13:56:17 1315 2.78 258.3 17:50 ***Cal 21 1999-06-30T07:46:50 1042 -0.71 286.0 01:45 77Cal 22 1999-08-14T08:30:52 2293 -2.26 252.5 18:08 66Cal 23 1999-09-16T17:27:02 1046 0.10 249.7 17:56 -50Cal 30 2001-05-25T11:23:58 132 13.65 254.6 13:10* Altitude are computed by subtracting the satellite radius given in Table 1 from the range vector.** Non-targeted encounters, Altitude column contains range in units of satellite radii.*** Encounter lostData Sampling:==============The data are sampled every two seconds for approximately one hour aboutthe time of satellite closest approach. Data are time tagged withspacecraft event time (SCET), represented in Universal TimeCoordinated (UTC). Data are extracted from SPICE SPK kernels at thesample time. Data are not averaged or otherwise resampled.Data Processing:================The trajectory data were created using code written by Steven Joy toextract information from the SPICE (GO-J-SPICE-6-SPK-V1.0) productsproduced by the Galileo project. The software used to create thisephemeris is well tested and in agreement with similar software providedby the Galileo project.Data:=====These data are derived from SPICE kernels produced by the Galileo NAVteam during the mission. All of the SPICE kernels used to produce thisdata set are contained on the MWG archive volume DVD in theEXTRAS/SPICE/KERNELS directory.The kernels (PDS PRODUCT_ID) used to create this were: S980326B.TSP - Prime Mission Reconstruction (JA - E12) S000131A.TSP - GEM reconstruction (E12-E26) S030129A.TSP - GMM (I27-A34) reconstruction, J35 predict PCK00007.TPC - Planetary constants kernel (2000-04-24) MK00062B.TSC - Galileo spacecraft clock kernelThis data set is highly discontinuous which makes the stated data setstart/stop time somewhat misleading. In order to avoid confusion, thestart and stop times of each data product in the data set are tabulatedin Table 4.Table 4: Data Product Start/Stop times======================================================================== Start Time Stop TimeMoon Orbit PRODUCT_ID UTC UTC----+----+-------------------------------------------------------------Ama 34 AMALTHEA_34_ORB.TAB 2002-11-05T05:50 2002-11-05T06:50Io 00 IO_00_ORB.TAB 1995-12-07T17:15 1995-12-07T18:15Io 24 IO_24_ORB.TAB 1999-10-11T04:00 1999-10-11T05:00Io 25 IO_25_ORB.TAB 1999-11-26T03:35 1999-11-26T04:35Io 27 IO_27_ORB.TAB 2000-02-22T13:15 2000-02-22T14:15Io 31 IO_31_ORB.TAB 2001-08-06T04:30 2001-08-06T05:30Io 32 IO_32_ORB.TAB 2001-10-16T00:55 2001-10-16T01:55Io 33 IO_33_ORB.TAB 2002-01-17T13:40 2002-01-17T14:40Eur 04 EUROPA_04_ORB.TAB 1996-12-19T06:20 1996-12-19T07:20Eur 06 EUROPA_06_ORB.TAB 1997-02-20T16:35 1997-02-20T17:35Eur 11 EUROPA_11_ORB.TAB 1997-11-06T20:00 1997-11-06T21:00Eur 12 EUROPA_12_ORB.TAB 1997-12-16T11:30 1997-12-16T12:30Eur 14 EUROPA_14_ORB.TAB 1998-03-29T12:50 1998-03-29T13:50Eur 15 EUROPA_15_ORB.TAB 1998-05-31T20:50 1998-05-31T21:50Eur 16 EUROPA_16_ORB.TAB 1998-07-21T04:35 1998-07-21T05:35Eur 17 EUROPA_17_ORB.TAB 1998-09-26T03:25 1998-09-26T04:25Eur 18 EUROPA_18_ORB.TAB 1998-11-22T11:15 1998-11-22T12:15Eur 19 EUROPA_19_ORB.TAB 1999-02-01T01:50 1999-02-01T02:50Eur*** 25 EUROPA_25_ORB.TAB 1999-11-25T16:00 1999-11-25T17:00Eur 26 EUROPA_26_ORB.TAB 2000-01-03T17:30 2000-01-03T18:30Gan 01 GANYMEDE_01_ORB.TAB 1996-06-27T06:00 1996-06-27T07:00Gan 02 GANYMEDE_02_ORB.TAB 1996-09-06T18:30 1996-09-06T19:30Gan 07 GANYMEDE_07_ORB.TAB 1997-04-05T06:40 1997-04-05T07:40Gan 08 GANYMEDE_08_ORB.TAB 1997-05-07T15:25 1997-05-07T16:25Gan*** 09 GANYMEDE_09_ORB.TAB 1997-06-26T16:50 1997-06-26T17:50Gan*** 12 GANYMEDE_12_ORB.TAB 1997-12-15T09:50 1997-12-15T09:50Gan 28 GANYMEDE_28_ORB.TAB 2000-05-20T09:40 2000-05-20T10:40Gan 29 GANYMEDE_29_ORB.TAB 2000-12-28T07:55 2000-12-28T08:55Cal 03 CALLISTO_03_ORB.TAB 1996-11-04T13:05 1996-11-04T14:05Cal 09 CALLISTO_09_ORB.TAB 1997-06-25T13:15 1997-06-25T14:15Cal 10 CALLISTO_10_ORB.TAB 1997-09-16T23:50 1997-09-17T00:50Cal 20 CALLISTO_20_ORB.TAB 1999-05-05T13:25 1999-05-05T14:25Cal 21 CALLISTO_21_ORB.TAB 1999-06-30T07:15 1999-06-30T08:15Cal 22 CALLISTO_22_ORB.TAB 1999-08-14T08:00 1999-08-14T09:00Cal 23 CALLISTO_23_ORB.TAB 1999-09-16T17:00 1999-09-16T18:00Cal 30 CALLISTO_30_ORB.TAB 2001-05-25T10:55 2001-05-25T11:55All data are archived in ASCII tables (1 orbit/file) with the followingtable structure:Column Type Description _________________________________________________________________________time char Sample time in PDS time format numberR real SPRH range from satellite in moon radii (Rm - Table 1)LAT real SPRH latitude of the S/C LON real SPRH east longitude of the S/C X real PhiO X range to the S/C Y real PhiO Y range to the S/C Z real PhiO Z range to the S/C Ancillary Data:===============SPICE kernels MK98264A.TLS (leapseconds), MK98264A.TLS (spacecraftclock), PK96030A.TPC (planetary constants), S980326B.TSP, S000131A.TSP,and S020128A.TSP (spacecraft/planetary ephemeris) located in theEXTRAS/SPICE/KERNELS directory of the archive volumes can all beconsidered as ancillary data files for this data set. These arethe files that were used to generate this data set. Ideally, these datashould be generated on demand using the latest SPICE kernels availablefrom the NAIF Node of the PDS.References:===========Russell, C.T., Geophysical coordinate transformations, CosmicElectrodynamics, Reidel Publishing Co., Vol. 2, 174-196, 1971.Dessler, A. J., Appendix B Coordinate Systems, in Physics of the JovianMagnetosphere, (edited by A. J. Dessler), Cambridge Univ Press, 1983.Kivelson M.G., K.K. Khurana, S. Joy, C.T. Russell, R. J. Walker, andC. Polanskey, Europa's magnetic signature: Report from Galileo's firstpass on December 19, 1996, Science, 276, P. 1239, 1997.Khurana, K.K., M.G. Kivelson, C.T. Russell, R.J. Walker, D.J. Southwood,No Intrinsic Field Associated with Callisto, Nature, 387, P. 262, 1997.Kivelson, M.G., K.K. Khurana, F.V. Coroniti, S. Joy, C.T. Russell,R.J. Walker, J. Warnecke, L. Bennett, and C. Polanskey, The magneticfield and magnetosphere of Ganymede., Geophys. Res. Lett., 24, P.2155,1997Kivelson M.G., K.K. Khurana, R.J. Walker, C.T. Russell, J.A. Linker,D.J. Southwood, and C. Polanskey, A Magnetic Signature at Io: InitialReport from the Galileo Magnetometer, Science, 273, P. 337, 1996.
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| DATA_SET_RELEASE_DATE |
2002-07-15T00:00:00.000Z
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| START_TIME |
1995-12-07T05:15:00.000Z
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| STOP_TIME |
2002-11-06T06:50:00.000Z
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| MISSION_NAME |
GALILEO
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| MISSION_START_DATE |
1977-10-01T12:00:00.000Z
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| MISSION_STOP_DATE |
2003-09-21T12:00:00.000Z
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| TARGET_NAME |
IO PLASMA TORUS
GANYMEDE
IO
CALLISTO
AMALTHEA
EUROPA
JUPITER
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| TARGET_TYPE |
PLASMA CLOUD
SATELLITE
PLANET
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| INSTRUMENT_HOST_ID |
GO
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| INSTRUMENT_NAME |
N/A
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| INSTRUMENT_ID |
POS
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| INSTRUMENT_TYPE |
N/A
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| NODE_NAME |
planetary plasma interactions
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| ARCHIVE_STATUS |
ARCHIVED
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| CONFIDENCE_LEVEL_NOTE |
These data have been generated by software from the Galileo projectapproved SPICE kernels. The software has been tested extensively andverified using project provided trajectory data sets for some coordinatesystems. Data can be considered to be reliable to the precision impliedby the number of significant digits provided.
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| CITATION_DESCRIPTION |
Joy, S.P., Mafi, J.N., GO JUP POS GLL TRAJECTORY MOON CENTERED COORDS V1.0, GO-J-POS-6-SC-TRAJ-MOON-COORDS-V1.0, NASA Planetary Data System, 2002
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| ABSTRACT_TEXT |
This data set contains Galileo trajectory data in moon (Amalthea, Io, Europa, Ganymede, Callisto) centered coordinates for all of the near satellite encounters. Ephemeris data are provided every two seconds for approximately one hour about closest approach.
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| PRODUCER_FULL_NAME |
MR. STEVEN P. JOY
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| SEARCH/ACCESS DATA |
Planetary Plasma Interactions Website
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