The Lunar Prospector ephemeris data set consists of spacecraft position and velocity determinations as a function of time in Moon-centered, Earth equator, mean of J2000 coordinates. Tracking data collected by ground stations are used by the Goddard Flight Dynamics Analysis Branch (FDAB) to compute the Lunar Prospector orbit ephemeris. The Level 0 Data archive contains the ephemeris type known as the 'definitive ephemeris', which is based on an updated lunar gravity model [FDAB1997].

The Lunar Prospector spacecraft position data set consists of spacecraft position determinations in selenographic latitude, longitude, and altitude coordinates in one minute intervals. The data set also contains spacecraft velocity and distance from the center of the Moon as a function of time. The coordinate system is selenographic with east longitude positive. The data set is generated by the Goddard Flight Dynamics Analysis Branch.

The Lunar Prospector spacecraft position data set consists of spacecraft position determinations in selenographic latitude, longitude, and altitude coordinates in one minute intervals. The data set also contains spacecraft velocity and distance from the center of the Moon as a function of time. The coordinate system is selenographic with east longitude positive. The data set is generated by the Goddard Flight Dynamics Analysis Branch.

This data set contains processed LP-GRS time-series data that are used as the fundamental data for deriving composition measurements of the lunar surface using either energy window techniques or the full modeling of the neutron and gamma ray transport processes. These data have been processed to eliminate bad data as well as to make corrections due to time variations in the cosmic ray flux, LP-GRS gain, LP-GRS orientation, and altitude above the lunar surface.

Time ordered 3-D spectrum data from the Lunar Prospector Electron Reflectometer, in units of particles/cm**2/sec/steradian/eV, for dates 1998-01-16 to 1999-07-29.

Trajectory data for the Lunar Prospector spacecraft in Selenographic, SSE, GSE, and GSM coordinates. Dataset covers dates 1998-01-16 to 1999-07-29.

Line of Sight Acceleration Profile Data Records (LOSAPDR) consist of data from Doppler tracking of the orbiting spacecraft. The relative motion of the spacecraft and the earth-based radio receiver is measured very precisely, and known motions are removed a priori (i.e. earth rotation, planetary motions, spacecraft orbital motion, solar pressure, drag), leaving small velocity changes caused by variations in the mass distribution of the planet. The residual Doppler frequency shifts are linearly proportional to the component of velocity in the Earth direction. Numerical differentiation of these velocity residuals with respect to time produces line-of-sight (LOS) gravity. These measures are accelerations at spacecraft altitude which can be modeled for geophysical interpretation. For information on Lunar Prospector (LP) gravity investigations see [KONOPLIVETAL1998 CARRANZAETAL1999].

This dataset contains tables of raw readings and reduced data from ten runs on 22 April 1972 of the Lunar Self-Recording Penetrometer (LSRP) on the surface of the Moon for the Apollo 16 Soil Mechanics experiment. Supporting documentation includes digitized scans in JPEG and PDF format of the original LSRP soil mechanics dataset on microfilm, videos and transcripts of the LSRP as it was operated on the Moon, diagrams and maps of the experiment areas, and photography of the Apollo 16 Stations 4 and 10 where the experiment was performed.

Time ordered high resolution data from the Lunar Prospector Electron Reflectometer, accumulated over 1/2 spacecraft spin, in units of particles/cm**2/sec/steradian/eV, for dates 1998-01-16 to 1999-07-29.

The Lunar Prospector attitude data set consists of values for the spacecraft spin rate and spin axis orientation (attitude) as a function of time. These values are determined from spacecraft attitude data (sun and limb crossing sensors) and ephemeris data. Spacecraft orientations are given as right ascension and declination of the spacecraft spin axis in the Mean-of-J2000 Ecliptic reference frame. The attitude data set consists of a single, cumulative file for the entire mission. Records are added to this file following each significant change in either the spin rate or spin axis orientation. The spacecraft spin rates and attitudes in this data set are orbit averages. The instantaneous spin rate can be determined from the sun pulse data set. The instantaneous spin rate varies as the spacecraft passes into and out of the Moon's shadow and after each spacecraft maneuver. Generally, an attitude record is included for times immediately before and after each maneuver.