File: AAREADME.TXT                        Version: NSSDC 11/15/2001  JFC
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The Pioneer 11 spacecraft was launched from Earth in April 1973 for 
encounters with Jupiter in Dec. 1974 and with Saturn in Sept. 1979, 
thereafter following a solar system escape trajectory. The file 
PIONEER11_NMC.TXT includes information extracted from the NSSDC Master 
Catalog about this mission and the onboard experiments. 

The following table gives the dates, times, and planetary radii (1 Rj = 
71,492 km; 1 Rs = 60,330 km) when Pioneer 11 first entered and last 
exited the magnetospheres of Jupiter and Saturn, these being the 
intervals for which interplanetary data are not available. 

Pioneer 11/Jupiter

Event  Year/Day/Time      Radius    Year-Month-Day

Entry  1974/330/03:39.3  109.7 Rj   1974-11-26
Exit   1974/343/03:46.0   95.0 Rj   1974-12-09

Pioneer 11/Saturn

Entry  1979/243/10:42.4   24.1 Rs   1979-08-31
Exit   1979/251/14:04.5   102  Rs   1979-09-08


The following subdirectories include data and information for various
experiments and datatypes as indicated:

MAG - interplanetary and planetary data from the Helium Vector 
      Magnetometer (HVM) Experiment of the Jet Propulsion Laboratory and 
      planetary data from the Fluxgate Magnetometer (FGM) Experiment of 
      NASA Goddard Space Flight Center. 

PLASMA - Plasma Analyzer (PA) Experiment, NASA Ames Research Center

MERGED - Merged and hourly averaged solar wind plasma, magnetic field, 
         and spacecraft trajectory data set compiled by NSSDC

PARTICLE - four energetic particle/cosmic ray experiments (CPI, CRT, GTT, 
           TRD)

UV - Ultraviolet Photometer Experiment, University of Southern California

TRAJ - spacecraft ephemeris data sets from the Pioner Project at NASA 
       Ames Research Center and NSSDC's Satellite Situation Center (SSC)


Related Information and Data:

Further details on the spacecraft, experiment, data sets at NSSDC, and 
related WWW sites can be found on the Pioneer 10/11 flight project page 
under

http://nssdc.gsfc.nasa.gov/space/

Hour averages of the interplanetary trajectory and solar wind data may be 
also be accessed and plotted on-line through the COHOWeb service based at 
the same WWW site as above. Access to the Satellite Situation Center (SSC) 
service forheliocentric coordinates from Pioneer, Voyager, Ulysses, and 
other spacecraft operating in interplanetary space is also provided from 
this site. The SSC maintains extensive data bases of orbital elements and 
cartesian coordinates for many earth-orbiting and interplanetary science 
spacecraft.

Acknowledgement:

Use of these data in publications should be accompanied at minimum by
acknowledgements of the National Space Science Data Center and the 
responsible Principal Investigator defined in the experiment documentation 
provided here.