Data Set Information
DATA_SET_NAME GO JUP POS GLL TRAJECTORY JUPITER CENTERED COORDINATES V1.0
DATA_SET_ID GO-J-POS-6-SC-TRAJ-JUP-COORDS-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Overview:=========This data set contains the Galileo spacecraft trajectory data in threecoordinate systems commonly used in the analysis of jovian magnetosphericdata. These include System III (1965.0), Jupiter Solar Equatorial (JSE),and Jupiter Solar Magnetospheric (JSM) coordinates. The data are sampledevery minute inside of 30 Jupiter radii, every ten minutes between 30 and100 Rj, and every 30 minutes outside of 100 Rj. The data are derivedfrom SPICE SP kernels which are archived at the NAIF Node of the PDS. ------------------------------------------------------------------- Table 2. Galileo Orbit Information ------------------------------------------------------------------- Orbit <--- Periapsis Info ----> <-- Apoapsis Info --> Start Periapsis Range Local Apoapsis Range Local Orb Date Date/Time Time Date Time ------------------------------------------------------------------- J00 95-12-03 95-12-07 21:54 4.00 16:21 96-03-29 267.7 03:39 G01 96-06-23 96-06-28 00:31 11.03 15:36 96-08-09 125.3 03:24 G02 96-09-01 96-09-07 13:38 10.65 15:22 96-10-07 113.0 03:12 C03 96-11-02 96-11-06 13:31 9.21 15:34 96-11-27 89.1 03:28 E04 96-12-15 96-12-19 03:22 9.16 15:21 97-01-04 72.1 03:00 J05* 97-01-15 97-01-20 00:26 9.05 14:54 97-02-04 72.1 02:48 E06 97-02-16 97-02-20 20:55 9.12 14:28 97-03-14 89.2 02:20 G07 97-03-30 97-04-04 11:03 9.12 14:14 97-04-21 75.9 01:56 G08 97-05-04 97-05-08 11:42 9.27 13:29 97-06-02 100.2 01:21 C09 97-06-22 97-06-27 11:52 10.77 12:35 97-08-08 143.0 00:21 C10 97-09-14 97-09-18 23:10 9.17 12:44 97-10-13 98.9 00:36 E11 97-11-02 97-11-06 23:02 9.03 12:36 97-11-26 84.1 00:29 E12 97-12-15 97-12-16 06:35 8.80 12:29 97-12-20 46.6 00:37 J13* 98-02-09 98-02-10 23:09 8.85 12:33 98-03-06 95.2 00:25 E14 98-03-28 98-03-29 07:59 8.83 12:17 98-04-30 199.7 00:16 E15 98-05-30 98-06-01 02:34 8.85 12:12 98-06-26 100.4 00:03 E16 98-07-20 98-07-20 17:18 9.93 11:54 98-08-23 124.4 23:51 E17 98-09-25 98-09-26 08:26 8.91 11:44 98-10-24 110.4 23:34 E18 98-11-21 98-11-22 03:57 9.23 11:24 98-12-27 129.0 23:17 E19 99-01-31 99-02-01 02:38 9.24 10:56 99-03-18 154.3 22:40 C20 99-05-02 99-05-03 17:00 9.37 10:24 99-06-02 114.5 21:46 C21 99-06-29 99-07-02 05:04 7.27 10:04 99-07-22 89.0 21:57 C22 99-08-11 99-08-12 10:58 7.32 09:50 99-08-29 77.1 21:23 C23 99-09-13 99-09-14 19:57 6.55 09:17 99-09-27 65.7 20:46 I24 99-10-10 99-10-11 03:31 5.68 08:41 99-11-01 97.7 20:47 I25 99-11-25 99-11-26 23:30 5.94 08:39 99-12-15 87.2 20:28 E26 00-01-01 00-01-04 03:33 5.78 08:14 00-01-28 102.7 20:05 I27 00-02-20 00-02-22 12:30 5.85 07:56 00-04-06 154.4 19:55 G28 00-05-17 00-05-21 04:52 6.68 07:18 00-09-08 289.9 18:37 G29 00-12-27 00-12-29 03:26 7.49 06:03 01-03-11 216.3 17:37 C30 01-05-07 01-05-23 17:33 7.28 05:11 01-06-29 136.8 16:27 I31 01-08-04 01-08-06 04:52 5.93 04:14 01-09-10 132.2 16:05 I32 01-10-14 01-10-15 23:56 5.78 03:53 01-12-01 160.7 15:39 I33 02-01-16 02-01-17 16:23 5.54 03:13 02-06-13 348.1 14:21 A34 02-11-04 02-11-05 07:24 1.99 01:40 03-04-14 336.7 12:49 J35 03-09-21 03-09-21 18:57 Entry Time * Solar conjunction - no data from this orbit ** Rj = 71492 kmCoordinates:============The Jupiter System III (1965) coordinate system follows the definition ofDr. Alex Dessler in Appendix B of 'Physics of the Jovian Magnetosphere'[DESSLER1983]. This coordinate system is the accepted standard foranalysis of data from the jovian system. System III is a spherical,planetographic coordinate system where the planetary rotation rate of(9h, 55m, 29.71s) is based on the rate of rotation of Jupiter's magneticfield. The prime meridian is defined as the sub-Earth meridian at00:00:00 UT on Jan 1, 1965. Range is measured from the Jupiter center ofmass. Longitude for standard System III is measured west. This directionchoice causes the coordinate system to be left-handed and to a stationaryor distant observer, longitude increases with time. Left handedcoordinate systems are not in common use among physicists. Both eastand west longitudes are included in this data set. Also included is thelocal time of the spacecraft where noon is defined to be the sub-Sundirection, midnight in the anti-Sun direction, etc.The Jupiter Solar Equatorial (JSE) coordinate system is a Cartesiancoordinate system defined by using the Sun direction and the Jupiterspin axis. Distances are measured from the Jupiter center ofmass and are provided here in units of jovian radii (1 Rj = 71492 km).Z-axis is taken along the Jupiter spin axis, positive in the northernhemisphere (OMEGA). The X-Z plane contains the instantaneous vector tothe Sun center of mass (SUN), as observed by Jupiter. Thus: JSE_Z = OMEGA JSE_Y = OMEGA x SUN JSE_X = JSE_Y x JSE_ZThis coordinate system is primarily used in orbit analysis, analysis ofsolar wind and interplanetary magnetic field data, and other data wherethe solar wind flow direction (-X) is the dominant process.The Jupiter Solar Magnetospheric (JSM) coordinate system is a Cartesiancoordinate system defined by using the Sun direction and the Jupiterdipole moment vector as principal vectors. The dipole selected is thebest fit, centered dipole, defined to be tilted 9.6 degrees towards202 degrees System III (1965.0) west longitude [CONNERNEY1981] in thenorthern hemisphere. The positive X direction is taken to be theinstantaneous direction to the Sun center of mass, as observed by theJupiter center of mass. The XZ-plane is defined to contain the magneticdipole vector (M). Thus M x X = Y and X x Y = Z. Distances are measuredfrom the Jupiter center of mass and are provided here in units of jovianradii.The JSM coordinate system is primarily used in the analysis of data fromregions where both the solar wind flow velocity (-X) and the rotating Jovianmagnetic field are important but where the solar wind flow is stillthe dominant force (near the magnetopause and in the magnetosheath).Data Sampling:==============The data are sampled every minute inside of 30 Jupiter radii, everyten minutes between 30 and 100 Rj, and every 30 minutes outside of 100 Rj.Samples are taken on the even 1, 10 and 30 minute sample times.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. All of the SPICE kernels used to produce thisdata set are contained on the Io/J0 MWG archive volume CDROM in theGEOMETRY directory.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 kernelAll 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 Range from Jupiter in Rj where 1 Rj = 71492 kmS3_LAT real Jovigraphic latitude of the S/C S3_WLON real System III west longitude of the S/C JSE_X real X Jupiter Solar Equatorial (JSE) coordinates JSE_Y real Y Jupiter Solar Equatorial (JSE) coordinates JSE_Z real Z Jupiter Solar Equatorial (JSE) coordinates JSM_X real X Jupiter Solar Magnetospheric (JSM) coordinates JSM_Y real Y Jupiter Solar Magnetospheric (JSM) coordinates JSM_Z real Z Jupiter Solar Magnetospheric (JSM) coordinates local_hr real Local time (decimal hours)mag_hr real Magnetic local time (decimal hours)Local time definition: Sun ^ | noon Planetocentric 12:00 Equatorial Projection | | | | Jupiter * * */ * | * (dusk) 18:00 -----------*--|--*------------- 06:00 (dawn) * |\ * * * * | \ | \ | \ |-HA--\ 00:00 midnightLocal hour angle is the angle (HA) between the observer's (Galileo)sub-Jupiter meridian and the anti-sunward meridian, measured in thejovian equatorial plane in the direction of planetary rotation. Localtime is the conversion of the local hour angle into units of time byusing the conversion factor that equates one hour to fifteen degrees oflongitude. Magnetic local time follows the same convention with thedifference being that the reference pole is the dipole moment vector (M)rather than the jovian spin axis (Omega). Local time values are providedhere in units of decimal hours.Magnetic local time definition: Sun ^ | noon Dipole 12:00 Equatorial Projection | | | | Jupiter * * */ * | * (dusk) 18:00 -----------*--|--*------------- 06:00 (dawn) * |\ * * * * | \ | \ | \ |-MHA-\ 00:00 midnightMagnetic local hour angle is the angle (MHA) between the observer'sdipole meridian and the anti-sunward meridian, measured in themagnetic equatorial plane in the direction of planetary rotation.Magnetic time is the conversion of the magnetic local hour angle intounits of time by using the conversion factor that equates one hourto fifteen degrees of longitude. Magnetic local time values are providedhere in units of decimal hours.Ancillary Data:===============SPICE kernels MK98264A.TLS (leapseconds), MK98264A.TLS (spacecraftclock), PK96030A.TPC (planetary constants), S980326B.TSP, S991130A.TSP,and S020128A.BSP (spacecraft/planetary ephemeris), and the rotor attitudefile ROT_ATT.TAB located in the GEOMETRY directory of the GOMW_5001 volumecan all be considered 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.Connerney, J. E. P., The magnetic field of Jupiter: A generalizedinverse approach, J. Geophys. Res., 86, 7679-7693, 1981.Dessler, A. J., Appendix B Coordinate Systems, in Physics of the JovianMagnetosphere, (edited by A. J. Dessler), Cambridge Univ Press, 1983.
DATA_SET_RELEASE_DATE 2002-07-15T00:00:00.000Z
START_TIME 1995-11-06T12:00:00.000Z
STOP_TIME 2003-09-21T06:45:00.000Z
MISSION_NAME GALILEO
MISSION_START_DATE 1977-10-01T12:00:00.000Z
MISSION_STOP_DATE 2003-09-21T12:00:00.000Z
TARGET_NAME IO PLASMA TORUS
GANYMEDE
IO
CALLISTO
AMALTHEA
EUROPA
JUPITER
TARGET_TYPE PLASMA CLOUD
SATELLITE
PLANET
INSTRUMENT_HOST_ID GO
INSTRUMENT_NAME N/A
INSTRUMENT_ID POS
INSTRUMENT_TYPE N/A
NODE_NAME planetary plasma interactions
ARCHIVE_STATUS ARCHIVED
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.
CITATION_DESCRIPTION Joy, S.P., Mafi, J.N., GO JUP POS GLL TRAJECTORY JUPITER CENTERED COORDINATES V1.0, GO-J-POS-6-SC-TRAJ-JUP-COORDS-V1.0, NASA Planetary Data System, 2002
ABSTRACT_TEXT This data set contains the Galileo spacecraft trajectory data in three coordinate systems commonly used in the analysis of jovian magnetospheric data. These include System III (1965.0), Jupiter Solar Equatorial (JSE), and Jupiter Solar Magnetospheric (JSM) coordinates. The data are sampled every minute inside of 30 Jupiter radii, every ten minutes between 30 and 100 Rj, and every 30 minutes outside of 100 Rj. The data are derived from SPICE SP kernels which are archived at the NAIF Node of the PDS.
PRODUCER_FULL_NAME MR. STEVEN P. JOY
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