urn:nasa:pds:mess_grs_raw:data_edr:grs_raw2012157zzz_dat 1.0 1.10.1.0 Product_Observational 2018-06-08 1.0 PDS4 migrated product 2012-06-05T00:00:59.000Z 2012-06-05T23:59:13.000Z MESSENGER Mission urn:nasa:pds:context:investigation:mission.messenger data_to_investigation MESSENGER Spacecraft urn:nasa:pds:context:instrument_host:spacecraft.mess is_instrument_host Gamma Ray Spectrometer Instrument urn:nasa:pds:context:instrument:grs.mess is_instrument Mercury Planet urn:nasa:pds:context:target:planet.mercury data_to_target Mercury Orbit Year 2 1/247341925 1/247428219 grs_hpge_raw_spectra pipe-grs2edr 1.1 hpge grs_raw2012157zzz.dat 2012-06-06T23:37:54Z 0 407 This table contains one set of raw spectra collected from the high purity Germanium (HPGe) detector, MESSENGER Gamma Ray Spectrometer (GRS). A set is defined as all data with MET timestamps corresponding to a given Earth day. Additional details are contained in the EDR SIS document. 9 1 32792 met 1 1 UnsignedMSB4 4 Mission elapsed time, in seconds, corresponding to the start of the accumulation period for the spectra. accum_time 2 5 UnsignedMSB4 4 Accumulation time in seconds of the HPGe detector. midpoint_met 3 9 UnsignedMSB4 4 The mission elapsed time at the midpoint of the observation. Defined as: MET at the start of the observation + (ACCUM_TIME / 2). orbit_number 4 13 UnsignedMSB2 2 Orbit number is a unique identifier for a given orbit of the MESSENGER spacecraft around Mercury. Orbit number is defined as starting at apoherm and is calculated using the MET value and the appropriate SPICE kernels. Orbit numbering does not start until MESSENGER performs the Mercury orbit insertion. Until that time the value for orbit number is 0. start_bin 5 15 UnsignedMSB2 2 Start Bin of the HPGe detector. number_of_bins 6 17 UnsignedMSB2 2 Number of bins in the raw spectra. grs_priority_level 7 19 UnsignedMSB2 2 Indicates the type of priority assigned to the science packet. The priority level is tied to the ApID of the packet. Priority level varies from 0-3, 0 being highest and 3 being lowest priority. missing_data_packets 8 21 UnsignedMSB2 2 The value represents a 16-bit binary number where each bit indicates whether an HPGe Raw telemetry packet is missing from the EDR. Each HPGe Raw EDR consists of information extracted from 16 telemetry packets in a complete observation. The least significant bit is a flag corresponding to the first of 16 packets and the most significant bit is a flag corresponding to the 16th packet. A bit value of 1 indicates that a given packet is missing from the EDR. For example, a value of 0 in this column indicates that the spectra from all 16 packets have been downloaded and included in the HPGE_RAW spectra for this EDR. A value of 3 indicates that the spectra information from the first and second packets are missing and therefore spectral bins 0-2047 should be discounted from analysis of the HPGE_RAW spectra. bad_data_flag 9 23 UnsignedMSB2 2 Intended for use as a bit-string bad data flag to indicate specific problems associated with the data. Values are expected to be assigned to specific bits as problems are identified during the course of the mission. Currently no values have been assigned and will default to a value of zero. 1 16384 1 0 25 32768 hpge_raw 1 1 UnsignedMSB2 2 Raw spectra accumulated by the HPGe detector. Contains the counts in each of the 16384 bins after one accumulation period. grs_raw2012157zzz.lbl 0 PDS3 Original PDS3 label Carriage-Return Line-Feed