urn:nasa:pds:odyssey_grs_edr:data_science_raw:gamma_spectra_20040407 1.0 1.19.0.0 Product_Observational 2026-07-01 1.0 Migration to PDS4 2004-04-07T00:00:04.621Z 2004-04-07T23:59:58.333Z MARS Odyssey Mission urn:nasa:pds:context:investigation:mission.2001_mars_odyssey data_to_investigation 2001 MARS ODYSSEY Host urn:nasa:pds:context:instrument_host:spacecraft.ody is_instrument_host GAMMA RAY SPECTROMETER Instrument urn:nasa:pds:context:instrument:ody.grs is_instrument Mars Planet urn:nasa:pds:context:target:planet.mars data_to_target 0010 GAMMA_SPECTRA 1.0 MAPPING 196035421285 196057538014 gamma_spectra_20040407.dat gamma_spectra_data_table 2004-11-17T20:56:41.046 0 4373 This the raw uncalibrated gamma ray spectra and associated data. 28 8 33075 SC_RECV_TIME 1 1 UnsignedMSB8 8 The time this packet was received by the spacecraft, in ticks (256 per second). SC_EV_TIME 2 9 UnsignedMSB8 8 Spacecraft time at the middle of the pixel, in ticks. CEB_TIME 3 17 UnsignedMSB8 8 ms Clock count from the GRS Common Electronics Box at the beginning of the pixel. UTC 4 25 ASCII_String 23 SC_EV_TIME converted to UTC, stored as yyyy-mm-ddThh:mm:ss.sss. GRS_PIXEL_NUMBER 5 48 UnsignedMSB4 4 Sequential counter of accumulation intervals, starts with one as grs orbit begins. Special case on reboot when the the CEB is in orbit 0, pixel 0. 0 GRS_ORBIT_NUMBER 6 52 UnsignedMSB4 4 Sequential counter of orbits from GRS CEB boot. 0 ODY_ORBIT_NUMBER 7 56 UnsignedMSB4 4 Orbit number common to all instruments aboard Odyssey. This orbit number is incremented by one as the spacecraft passes through the orbital descending node. 0 LATITUDE 8 60 IEEE754MSBDouble 8 Sub spacecraft latitude in Mars fixed coordinates at the middle of the pixel. LONGITUDE 9 68 IEEE754MSBDouble 8 Sub spacecraft longitude in Mars fixed coordinates at the middle of the pixel. 1 3 1 0 The geometric position (x,y,z) of the spacecraft with respect to Mars in the 'MARSIAU' inertial frame at the input epoch 'et' at the middle of the pixel. 76 24 SCPOS_INERT 1 1 IEEE754MSBDouble 8 km 2 3 1 0 The geometric velocity (x,y,z) of the spacecraft with respect to Mars in the 'MARSIAU' inertial frame at the input epoch 'et' at the middle of the pixel. 100 24 SCVEL_INERT 1 1 IEEE754MSBDouble 8 km/s 3 3 1 0 The (x,y,z) position of the sub-spacecraft point as seen from the spacecraft in the instrument frame at the middle of the pixel. If no spacecraft orientation data was available from the loaded CK files for the request time, then all elements of are set to zero. 124 24 MARSPOS_INSTR 1 1 IEEE754MSBDouble 8 km 4 3 1 0 Contains the inertial spacecraft velocity direction (x,y,z) rotated to the instrument frame at the middle of the pixel. If no spacecraft orientation data was available for the request time, then all elements are set to zero. 148 24 MARSVEL_INSTR 1 1 IEEE754MSBDouble 8 km/s 5 3 1 0 Spacecraft position (x,y,z) in Mars fixed coordinates at the middle of the pixel. 172 24 SCPOS_MARS 1 1 IEEE754MSBDouble 8 km 6 3 1 0 Sub instrument boresight (x,y,z) in Mars fixed coordinates at the middle of the pixel. 196 24 INSTR_BORESIGHT_MARS 1 1 IEEE754MSBDouble 8 km 7 3 1 0 Sub spacecraft vector (x,y,z) in Mars fixed coordinates at the middle of the pixel. 220 24 SUB_SCPOS_MARS 1 1 IEEE754MSBDouble 8 km SCALT 10 244 IEEE754MSBDouble 8 km Areocentric altitude of the sub-spacecraft point in Mars-fixed rotating frame at the middle of the pixel. DELTA_ANGLE 11 252 IEEE754MSBDouble 8 degrees Difference between instrument +y direction and true north at the middle of the pixel. Currently not computed for NEUTRON_SPECTRA and HEND_SPECTRA. MARS_SOL 12 260 IEEE754MSBDouble 8 Longitude of the Sun at 0 hours UT on the date of the record. Taken from the Association of Lunar and Planetary Observers 'Ephemeris for Physical Observation of Mars'. DAY_INDEX 13 268 UnsignedMSB2 2 Day of Martian year. LOCAL_HOUR 14 270 UnsignedByte 1 Local Sun hour at the sub-spacecraft point. LOCAL_MINUTE 15 271 UnsignedByte 1 Local Sun minute at the sub-spacecraft point. POINTING 16 272 UnsignedByte 1 1 = True -- pointing data available. INTERSECTING 17 273 UnsignedByte 1 1 = True -- the pointing vector intersects Mars. BAD_CODE 18 274 UnsignedMSB4 4 If non-zero, the data has been flagged bad. Definitions in bad_code.txt. COUNTER 19 278 UnsignedMSB4 4 A spectra can come down in up to 8 packets. Each packet has its own counter. This counter is the combination of all eight possible counters, four bits for each. FIRST_CHAN 20 282 UnsignedMSB2 2 First valid channel in the spectrum. LAST_CHAN 21 284 UnsignedMSB2 2 Last valid channel in the spectrum. LLD_CNTR 22 286 UnsignedMSB2 2 Lower level discriminator count. ULD_CNTR 23 288 UnsignedMSB2 2 Upper level discriminator count. L1_CNTR 24 290 UnsignedMSB2 2 Total number of gamma events within the L1 energy range. L2_CNTR 25 292 UnsignedMSB2 2 Total number of gamma events within the L2 energy range. L3_CNTR 26 294 UnsignedMSB2 2 Total number of gamma events within the L3 energy range. PHA_CNTR 27 296 UnsignedMSB4 4 Pulse Height Analyzer counter. PHA_TIMER 28 300 UnsignedMSB8 8 Pulse Height Analyzer timer. 8 16384 1 0 Raw uncompressed gamma spectrum. 308 32768 RAW_SPECTRUM 1 1 UnsignedMSB2 2 gamma_spectra_20040407.lbl 0 PDS3 PDS3 label Carriage-Return Line-Feed