PDS_VERSION_ID = PDS3 LABEL_REVISION_NOTE = "2016-JHU/APL MESSENGER" PRODUCT_VERSION_ID = "04" RECORD_TYPE = STREAM FILE_RECORDS = 637 ^HEADER = ("MESS_RS_OCC_V04.CSV",1) ^SPREADSHEET = ("MESS_RS_OCC_V04.CSV",303) INSTRUMENT_NAME = "RADIO SCIENCE SUBSYSTEM" INSTRUMENT_ID = "RSS" INSTRUMENT_HOST_NAME = "MESSENGER" TARGET_NAME = "MERCURY" DATA_SET_ID = "MESS-H-RSS/MLA-5-SDP-V1.0" MISSION_NAME = "MESSENGER" INSTRUMENT_HOST_ID = "MESS" PRODUCT_ID = "MESS_RS_OCC_V04" PRODUCT_TYPE = OCC PRODUCER_ID = "MESSENGER RS TEAM" PRODUCT_CREATION_TIME = 2016-055T00:00:00 START_TIME = 2008-014T19:10:29.700 STOP_TIME = 2015-116T15:24:09.850 DESCRIPTION = "This file contains a summary of MESSENGER radio occultation measurements of the radius of Mercury." OBJECT = HEADER HEADER_TYPE = SPREADSHEET RECORDS = 1 BYTES = 302 INTERCHANGE_FORMAT = ASCII DESCRIPTION = "The first record in the file contains a list of the column headings for the data in the following records. This header record is comma-delimited." END_OBJECT = HEADER OBJECT = SPREADSHEET ROWS = 636 ROW_BYTES = 188 FIELDS = 17 FIELD_DELIMITER = "COMMA" OBJECT = FIELD NAME = "RSR_FILE" FIELD_NUMBER = 1 BYTES = 31 DATA_TYPE = CHARACTER DESCRIPTION = "The name of the Radio Science Receiver file that contains the raw data for this occultation" END_OBJECT = FIELD OBJECT = FIELD NAME = "TRAJECTORY_FILE(SPK)" FIELD_NUMBER = 2 BYTES = 36 DATA_TYPE = CHARACTER DESCRIPTION = "Spacecraft mission ephemeris file name" END_OBJECT = FIELD OBJECT = FIELD NAME = "INGRESS/EGRESS" FIELD_NUMBER = 3 BYTES = 1 DATA_TYPE = CHARACTER DESCRIPTION = "Occultation event, ingress (I) or egress (E)" END_OBJECT = FIELD OBJECT = FIELD NAME = "OCCULTATION_TIME" FIELD_NUMBER = 4 BYTES = 21 DATA_TYPE = TIME DESCRIPTION = "The time, in UTC, of geometric occultation as observed at the DSN station. This is the time when RF power is one quarter (-6dB) of the unocculted power" END_OBJECT = FIELD OBJECT = FIELD NAME = "ORBIT_NUMBER" FIELD_NUMBER = 5 BYTES = 5 DATA_TYPE = ASCII_INTEGER DESCRIPTION = "Spacecraft orbit number for this occultation. Orbit one begins at the first apoapsis following the orbit-insertion maneuver. Orbit zero (0) indicates a flyby occultation." END_OBJECT = FIELD OBJECT = FIELD NAME = "DIRECTION_OF_RF_PATH" FIELD_NUMBER = 6 BYTES = 8 DATA_TYPE = ASCII_REAL UNIT = "deg" DESCRIPTION = "The angle between the local meridian and the direction of Earth at the occultation point, measured positive from local north toward local east. The angle or bearing indicates the direction of signal propagation. A RF signal traveling from due west toward due east as it grazed the surface would have a Direction_of_RF_Path of 90 degrees." END_OBJECT = FIELD OBJECT = FIELD NAME = "PERPENDICULAR_SPEED" FIELD_NUMBER = 7 BYTES = 5 DATA_TYPE = ASCII_REAL UNIT = "km/s" DESCRIPTION = "The component of the apparent velocity of MESSENGER with respect to Mercury's limb that is perpendicular to both the limb and the line of sight to Earth. When multiplied by the uncertainty in time, Perpendicular_speed provides the time-based uncertainty in the radius measurement derived from the occultation time." END_OBJECT = FIELD OBJECT = FIELD NAME = "TANGENT_LATITUDE" FIELD_NUMBER = 8 BYTES = 7 DATA_TYPE = ASCII_REAL UNIT = "deg" DESCRIPTION = "At the time of geometric occultation, this is the latitude that the RF path would graze the surface of a smooth sphere centered at Mercury's center of mass." END_OBJECT = FIELD OBJECT = FIELD NAME = "TANGENT_LONGITUDE" FIELD_NUMBER = 9 BYTES = 8 DATA_TYPE = ASCII_REAL UNIT = "deg" DESCRIPTION = "At the time of geometric occultation, this is the longitude that the RF path would graze the surface of a smooth sphere centered at Mercury's center of mass." END_OBJECT = FIELD OBJECT = FIELD NAME = "RAW_MEASURED_RADIUS" FIELD_NUMBER = 10 BYTES = 8 DATA_TYPE = ASCII_REAL UNIT = "km" DESCRIPTION = "At the time of geometric occultation, this is the minimum distance between Mercury's center of mass and the RF path between MESSENGER and the DSN antenna in contact with MESSENGER. Calculations include light-time effects." END_OBJECT = FIELD OBJECT = FIELD NAME = "TIME_UNCERTAINTY" FIELD_NUMBER = 11 BYTES = 5 DATA_TYPE = ASCII_REAL UNIT = "second" DESCRIPTION = "The uncertainty in the time of geometric occultation." END_OBJECT = FIELD OBJECT = FIELD NAME = "TIME_RES" FIELD_NUMBER = 12 BYTES = 5 DATA_TYPE = ASCII_REAL UNIT = "second" DESCRIPTION = "The time step of the RF power data used to fit to the diffraction pattern." END_OBJECT = FIELD OBJECT = FIELD NAME = "DECAY_SCALE" FIELD_NUMBER = 13 BYTES = 5 DATA_TYPE = ASCII_REAL UNIT = "second" DESCRIPTION = "The scale length of the diffraction pattern, converted to seconds based on the velocities and geometry of MESSENGER, Mercury, and the Earth." END_OBJECT = FIELD OBJECT = FIELD NAME = "PC/NO" FIELD_NUMBER = 14 BYTES = 6 DATA_TYPE = ASCII_REAL UNIT = "dB*Hz" DESCRIPTION = "Downlink received carrier power (Watts) of the unocculted transmissions divided by the noise power spectral density (Watts/Hz)." END_OBJECT = FIELD OBJECT = FIELD NAME = "ALGORITHM" FIELD_NUMBER = 15 BYTES = 1 DATA_TYPE = ASCII_INTEGER DESCRIPTION = "The integer identifies the algorithm used to extract the carrier power from the RSR data: 0= Fast Fourier Transform (FFT); 1= Software Phase Locked Loop (PLL); 2= Overlapping FFT" END_OBJECT = FIELD OBJECT = FIELD NAME = "S/C-TO-LIMB_DISTANCE" FIELD_NUMBER = 16 BYTES = 11 DATA_TYPE = ASCII_REAL UNIT = "km" DESCRIPTION = "At the time of occultation, the distance between MESSENGER and the smooth-sphere occultation point at Mercury." END_OBJECT = FIELD OBJECT = FIELD NAME = "LIMB-TO-DSN_DISTANCE" FIELD_NUMBER = 17 BYTES = 11 DATA_TYPE = ASCII_REAL UNIT = "km" DESCRIPTION = "At the time of occultation, the distance between the DSN station and the smooth-sphere occultation point at Mercury." END_OBJECT = FIELD END_OBJECT = SPREADSHEET END