Data Set Information
DATA_SET_NAME P12 V RADIO SCIENCE SUBSYSTEM RESAMPLED LOS GRAVITY V1.0
DATA_SET_ID P12-V-RSS-4-LOS-GRAVITY-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : Line of sight (LOS) gravity data were obtained as part of the Radio Science Experiment by tracking 351 orbits of the Pioneer Venus Orbiter. The data set consists of a table with the following columns: spacecraft latitude, longitude (degrees), accelerations, and altitude (km). The acceleration data were determined from differentiation of raw Doppler residuals and are expressed as units of mm/s**2. To obtain LOS gravity in milligals, accelerations need to be multiplied by 100. An acceleration of 1.20 mm/s**2, therefore, corresponds to 120 mgal, a large gravity anomaly. An accompanying file contains ancillary data to supplement the gravity data file. The accompanying file has one record for each orbit in which LOS gravity data were acquired. Each record contains the minimum and maximum latitude and longitude, and altitudes for the orbit, along with the sub-earth point latitude and longitude, and the spacecraft location and velocity in a Venus centered coordinate system. Each record also contains a pointer to the first record for that orbit in the gravity data file, and the number of records for that orbit. Processing Level Id : 4 Software Flag : N Processing Start Time : 1978 Processing Stop Time : 1990 Parameters : Data Set Parameter 'LINE OF SIGHT ACCELERATION' ----------------------------------------------- The acceleration of the spacecraft due to planet mass anomalies, where acceleration is measured along the line of sight between the spacecraft antenna and the Deep Space Net. Obtained by tracking Doppler changes in telemetry frequency. Data Set Parameter Name : LINE OF SIGHT ACCELERATION Data Set Parameter Unit : MM/S**2 Sampling Parameter Name : PIXEL Sampling Parameter Unit : N/A Minimum Sampling Parameter : N/A Maximum Sampling Parameter : N/A Sampling Parameter Resolution : N/A Sampling Parameter Interval : N/A Minimum Available Sampling Int : N/A Noise Level : UNK Source Instrument Parameters : Instrument Host ID : P12 Data Set Parameter Name : LINE OF SIGHT ACCELERATION Instrument Parameter Name : RSSDETEB POWER Important Instrument Parameters : 1 Processing : N/A
DATA_SET_RELEASE_DATE 1990-06-15T00:00:00.000Z
START_TIME 1978-01-01T12:00:00.000Z
STOP_TIME 1980-01-01T12:00:00.000Z
MISSION_NAME PIONEER
PRE-MAGELLAN
MISSION_START_DATE 1978-05-20T12:00:00.000Z
1968-11-09T12:00:00.000Z
MISSION_STOP_DATE 1992-10-08T12:00:00.000Z
1988-07-27T12:00:00.000Z
TARGET_NAME VENUS
TARGET_TYPE PLANET
INSTRUMENT_HOST_ID P12
INSTRUMENT_NAME RADIO SCIENCE SUBSYSTEM
INSTRUMENT_ID RSS
INSTRUMENT_TYPE RADIO SCIENCE
NODE_NAME Geosciences
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE Overview : There are several possible sources for error, including the Earth's troposphere and ionosphere, Venus' atmosphere, and space plasma. The noise levels were very dynamic and changed from day to day. For specific information see Sjogren et al., 1980.
CITATION_DESCRIPTION Sjogren, W. L., P12 V RADIO SCIENCE SUBSYSTEM RESAMPLED LOS GRAVITY V1.0, P12-V-RSS-4-LOS-GRAVITY-V1.0, NASA Planetary Data System, 1990
ABSTRACT_TEXT Line of sight (LOS) gravity data were obtained as part of the Radio Science Experiment by tracking 351 orbits of the Pioneer Venus Orbiter. The data set consists of a table with the following columns: spacecraft latitude, longitude (degrees), accelerations, and altitude (km). The acceleration data were determined from differentiation of raw Doppler residuals and are expressed as units of mm/s**2. To obtain LOS gravity in milligals, accelerations need to be multiplied by 100. An acceleration of 1.20 mm/s**2, therefore, corresponds to 120 mgal, a large gravity anomaly.
PRODUCER_FULL_NAME WILLIAM L. SJOGREN
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