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NASA Space Science Data Coordinated Archive Header



Availability: Archived at NSSDC, accessible from elsewhere

Time span: 1990-11-05 to 1991-01-01


This description was generated automatically using input from the Planetary Data System.

Data Set Overview ================= This dataset contains the Galileo spacecraft trajectory during the Earth-1 flyby. The data have been derived from SPICE kernels at a 1 minute sample rate. The data are provided in both Geocentric Solar Ecliptic (GSE) and Geocentric Solar Magnetic (GSM) coordinates and are given in units of earth radii (Re) where 1 Re = 6378 km. Data ==== -----------------------------------------------------------------Table 1. Data record structure, -----------------------------------------------------------------Column Units Description -----------------------------------------------------------------time seconds S/C event time (UT) in the PDS format (yyyy-mm-ddThh:mm:ss.sss ) X Re S/C position X component in GSE or GSM coords. Y_gse Re S/C position Y component in GSE coords. Z_gse Re S/C position Z component in GSE coords. Y_gsm Re S/C position Y component in GSM coords. Z_gsm Re S/C position Z component in GSM coords. Coordinate Systems ================== The Galileo trajectory data are being archived in 2 coordinate systems. Geocentric Solar Ecliptic (GSE) and Geocentric Solar Magnetic (GSM) are related earth centered coordinate systems. Both the GSE and GSM X directions are taken along the Earth - Sun line, positive towards the Sun. The GSE Z direction is parallel to the ecliptic normal, positive northward, and Y completes the right-handed set (towards dusk). For GSM, the X-Z plane contains the Earth's dipole moment vector, positive northward, and Y completes the right-handed set. GSE coordinates are commonly used for analyzing the solar wind near the Earth and GSM coordinates are used when analyzing data inside the Earth's bow shock. Data Processing =============== The trajectory has been derived from the Galileo SPK kernel: 'S970311A.BSP' This kernel was obtained by the PDS-PPI node from the PDS-NAIF node. The code which produced the trajectory data was developed and executed at PDS-PPI. This code utilized SPICE routines which were developed at and distributed by PDS-NAIF. Both SPICE kernels and code may be available through PDS-NAIF.

These data are available on-line from the Planetary Data System (PDS) at:

Alternate Names



  • Planetary Science: Fields and Particles

Additional Information


Questions and comments about this data collection can be directed to: Dr. Edwin V. Bell, II



NameRoleOriginal AffiliationE-mail
Dr. Margaret Galland KivelsonGeneral ContactUniversity of California, Los
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