Data Set Information
DATA_SET_NAME VG2 NEP TRAJECTORY DERIV SUMM HELIOGRAPHIC COORDS 48SEC V1.0
DATA_SET_ID VG2-N-POS-5-SUMM-HGCOORDS-48SEC-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview ================= This dataset contains Voyager 2 position vectors relative to the Sun in both cartesian and spherical Heliographic coordinates for the time period when Voyager was near Neptune but not within its magnetosphere. The magnetospheric gap in this dataset occurs from 1989-08-25 02:00 -> 1989-08-26 00:00. Spacecraft position vectors are given in Neptune Longitude System (NLS) coordinates in this interval. The position vectors are given every 48 seconds. The units of the vector components are Au and degrees. Vectors are stored as 4-byte floating point values. The Heliographic coordinate system is defined in the reference epoch of 1950. The unit vectors which define the coordinate system are as follows: X points away from the Sun toward the ascending node, in the solar equatorial plane, Z points along the Sun's spin axis, positive above the equatorial plane, and Y completes the right handed set. Parameters ========== Sampling parameter name : time Sampling parameter resolution : 96.0 seconds Minimum sampling parameter : n/a Maximum sampling parameter : n/a Sampling parameter interval : 48.0 seconds Minimum available sampling interval : 48.0 seconds Data set parameter name : position vector Noise level : n/a Data set parameter unit : AU or degrees Coordinates =========== MEAN INERTIAL HG 1950 --------------------- COORDINATE_SYSTEM_CENTER_NAME = SUN COORDINATE_SYSTEM_REF_EPOCH = UNK /* 09-23-1950 */ The Heliographic coordinate system is defined in the reference epoch of 1950. The unit vectors which define the coordinate system are as follows: X points away from the Sun towards the ascending node, in the solar equatorial plane, Z points along the Sun's spin axis, positive above the equatorial plane, and Y completes the right handed set. Position is given in terms of the following: RANGE (R) - The range or R component of the spherical Heliographic coordinate system is the distance from the Sun's position at the reference epoch to the spacecraft measured in AU. LATITUDE (LAT) - The latitude component of the spherical Heliographic coordinate system is the angle between the solar equatorial plane of the reference epoch measured in the plane that contains the solar spin axis of that epoch. LONGITUDE (LONG) - The longitude component of the spherical Heliographic coordinate system is zero in the direction of the ascending node at the reference epoch (X direction) and increases for a body orbiting the Sun as the Earth does. X - The X component of the Heliographic coordinate system points away from the Sun, towards the ascending node, and lies in the solar equatorial plane. Y - The Y vector of the Heliographic coordinate system is formed by the righthanded cross product of the X and Z unit vectors. It lies in the solar equatorial plane and it points away from the Sun, but does not extend in the direction of any particular body. Z - The Z component of the Heliographic coordinate system is parallel to the Sun's spin axis, taken as positive above the equatorial plane of the Sun.
DATA_SET_RELEASE_DATE 1992-11-01T00:00:00.000Z
START_TIME 1989-08-22T12:00:47.000Z
STOP_TIME 1989-08-29T11:59:58.000Z
MISSION_NAME VOYAGER
MISSION_START_DATE 1972-07-01T12:00:00.000Z
MISSION_STOP_DATE N/A (ongoing)
TARGET_NAME NEPTUNE
TARGET_TYPE PLANET
INSTRUMENT_HOST_ID VG2
INSTRUMENT_NAME N/A
INSTRUMENT_ID POS
INSTRUMENT_TYPE N/A
NODE_NAME planetary plasma interactions
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE Confidence Level Overview ========================= This dataset was provided by the Voyager Magnetometer team. There is a significant problem with loss of precision in the spacecraft position. This is not an artifact of the Mag teams processing or handling of the data but in the precision of the Supplimental Experimenter Data Records (SEDR) for Voyager. Data Quality and Coverage ========================= Table 1 contains hourly summaries of the percentage of the data available, data quality, and contamination codes. Tables 2 and 3 contain descriptions of the data quality and data contamination ID's respectively. ------------------------------------------------------------------- Table 1. Hourly Data Coverage and Quality Summaries ------------------------------------------------------------------- Start Time Mode Percent Qual Contam NumGood ------------------------------------------------------------------- 1966-01-01T00:00:00 ENCOUNTER 14489.333 -1 -1 119537 -------------------------------------------------------------------- Table 2. Data Quality ID Descriptions -------------------------------------------------------------------- ID Description -------------------------------------------------------------------- -1 no attempt has been made to specify a data quality for this time range -------------------------------------------------------------------- Table 3. Data Contamination ID Descriptions -------------------------------------------------------------------- ID Description -------------------------------------------------------------------- -1 no evaluation of possible contamination has been made
CITATION_DESCRIPTION Lepping, R.J., VG2-N-POS-5-SUMM-HGCOORDS-48SEC-V1.0, VG2 NEP TRAJECTORY DERIV SUMM HELIOGRAPHIC COORDS 48SEC V1.0, NASA Planetary Data System, 1992.
ABSTRACT_TEXT This dataset contains Voyager 2 position vectors relative to the Sun in both cartesian and spherical Heliographic coordinates for the time period when Voyager was near Neptune but not within its magnetosphere. The magnetospheric gap in this dataset occurs from 1989-08-25 02:00 -> 1989-08-26 00:00. Spacecraft position vectors are given in Neptune Longitude System (NLS) coordinates in this interval. The position vectors are given every 48 seconds. The units of the vector components are Au and degrees. Vectors are stored as 4-byte floating point values.
PRODUCER_FULL_NAME DR. RONALD J. LEPPING
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