urn:nasa:pds:magellan_arcdr:data_orbit_header:ohf03476_1 1.0 1.20.0.0 Product_Observational 2024-02-03 1.0 Initial PDS4 version 1991-11-10T16:59:34Z 1991-11-10T17:15:42Z Magellan Mission urn:nasa:pds:context:investigation:mission.magellan data_to_investigation Magellan Host urn:nasa:pds:context:instrument_host:spacecraft.mgn is_instrument_host Radar System for Magellan Instrument urn:nasa:pds:context:instrument:mgn.rdrs is_instrument Venus Planet urn:nasa:pds:context:target:planet.venus data_to_target ARCDR 1 2 3476 Mapping Cycle 2 mg_2014 ohf03476_1.dat 1992-05-08T22:17:29.000Z Created with ARCDR processing software version 02 Orbit_Header_File Orbit_Header_File 0 1 This file contains a single binary record that describes the corresponding Altimetry data file (ADF) and radiometry data file (RDF) belonging to a given Magellan orbit. 14 0 112 SFDU 1 1 ASCII_String 20 The SFDU identifies the label and length of the Standard Format Data Unit (SFDU). Orbit_Number 2 21 UnsignedLSB4 4 The orbit_number element provides the Magellan orbit number corresponding to the associated altimetry and radiometry files. Altimetry_Footprints 3 25 UnsignedLSB4 4 The altimetry_footprints element provides the number of Standard Format Data Units in a specific orbit's altimetry data file. Radiometry_Footprints 4 29 UnsignedLSB4 4 The radiometry_footprints element provides the number of Standard Format Data Units in a specific orbit's radiometry data file. First_Alt_Footprint_TDB_Time 5 33 IEEE754LSBDouble 8 The first_alt_footprint_tdb_time element provides the spacecraft ephemeris time that represents the first altimeter footprint of this orbit. It is equal to the altimetry_footprint_tdb_time value in the first record of this orbit's altimetry data file. Last_Alt_Footprint_TDB_Time 6 41 IEEE754LSBDouble 8 The last_alt_footprint_tdb_time element provides the spacecraft ephemeris time that represents the last altimeter footprint of this orbit. It is equal to the altimetry_footprint_tdb_time value in the last record of this orbit's altimetry data file. First_Rad_Footprint_TDB_Time 7 49 IEEE754LSBDouble 8 The first_rad_footprint_tdb_time element provides the spacecraft ephemeris time that represents the first radiometer footprint of this orbit. It is equal to the radiometry_footprint_tdb_time value in the first record of this orbit's radiometry data file. Last_Rad_Footprint_TDB_Time 8 57 IEEE754LSBDouble 8 The last_rad_footprint_tdb_time element provides the spacecraft ephemeris time that represents the last radiometer footprint of this orbit. It is equal to the radiometry_footprint_tdb_time value in the last record of this orbit's radiometry data file. Average_Orbit_Peri_TDB_Time 9 65 IEEE754LSBDouble 8 The average_orbit_peri_tdb_time element provides the periapsis time of the predicted orbit. This orbit is based on the elements used to generate the uplink commands for the current mapping pass. It represents an average over the entire orbit, and is not the result of post-orbit navigation solutions. The elements should be used for comparison purposes only, since they may involve large errors. The predicted orbit elements are copied from the orbit header file of the ALT-EDR tape. Average_Semimajor_Axis 10 73 IEEE754LSBDouble 8 km The average_semimajor_axis element provides the semi-major axis of the predicted orbit. Average_Eccentricity 11 81 IEEE754LSBDouble 8 The average_eccentricity element provides the eccentricity of the predicted orbit. Average_Inclination 12 89 IEEE754LSBDouble 8 degree The average_inclination element provides the angle of inclination of the predicted orbit with respect to the xy-plane of the J2000 coordinate system. Average_Asc_Node_Longitude 13 97 IEEE754LSBDouble 8 degree The average_asc_node_longitude element provides the angle in the xy-plane of the J2000 coordinate system to the ascending node of the predicted orbit. Average_Periapsis_Argument 14 105 IEEE754LSBDouble 8 degree The average_periapsis_argument element provides the angle in the plane of the predicted orbit from the ascending node in the xy-plane of the J2000 coordinate system to the periapsis.