KPL/IK Apollo 15 X-Ray Instrument Kernel ======================================================================== This Apollo 15 SPICE instrument kernel (I-kernel) contains the instrument geometric parameters for the X-Ray instrument Version and Date -------------------------------------------------------- Version 1.0 -- September 06, 2018 - Alfredo Escalante Contact Information -------------------------------------------------------- References -------------------------------------------------------- 1. APOLLO 15 SIM BAY PHOTOGRAPHIC EQUIPMENT AND MISSION SUMMARY Prepared by Mapping Sciences Branch, NASA Manned Spacecraft Center, Houston, Texas, August, 1971. 2. APOLLO 15 PRELIMINARY SCIENCE REPORT Prepared by NASA Manned Spacecraft Center, Houston, Texas, 1972. Instrument Overview -------------------------------------------------------- The instrument consist on three main subsystems, three large-area proportional counters; a set of large-area filters for energy discrimination among the characteristic X-rays of Aluminum, Silicon and Magnesium; a data-handling system for count accumulation, sorting into eight pulse-height channels, and, finally, for relaying the data to the spacecraft telemetry. The data from the xrfs was transmitted from the CSM and recorded at ground stations on a magnetic tape. As the raw spectral data and ground tracking data were obtained, the corresponding ephemeris were derived. The X-ray measurements from the three detectors were sorted into seven equal interval energy channels covering the range 0.75 to 2.75 keV, plus an eighth channel for energies above the upper limit. Also, simultaneous measurements coming from a solar monitor covered a range of approximately 1 to 3 keV. The X-ray began taking measurements about 90 hours after launch time, UTC date 1971 JUL 30 08:09:11.500, during the seventh revolution around the Moon. During lunar orbit phase, more than 100 hours of measurements were made. Lunar far side data was recorded on a magnetic tape and then telemetered when on the near side. As both record and playback occurred in the same tape direction, the tape was rewound each time, causing eventual malfunctioning and some loss of far side data. FOV Definition --------------------------------------------------------------------------- \begindata INS-915250_FOV_FRAME = 'A15_XRAY' INS-915250_FOV_SHAPE = 'RECTANGLE' INS-915250_BORESIGHT = ( 0.0 0.0 +1.0 ) INS-915250_FOV_CLASS_SPEC = 'ANGLES' INS-915250_FOV_REF_VECTOR = ( +1.0 0.0 0.0 ) INS-915250_FOV_REF_ANGLE = ( 15 ) INS-915250_FOV_CROSS_ANGLE = ( 15 ) INS-915250_FOV_ANGLE_UNITS = 'DEGREES' \begintext Platform ID --------------------------------------------------------------------------- This number is the NAIF instrument ID of the platform on which the camera is mounted. \begindata INS-915250_PLATFORM_ID = ( -915000 ) \begintext