File: PVOTRJDY_FMT.txt                          Version: NSSDC 11/15/2001 JFC
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 Heliocentric Position of Venus for Pioneer Venus Orbiter Mission (1978-1992)

 Date Coverage: 1978-12-06 TO 1992-10-08

 Data Contact: R. (Sardi) Parthasarathy
               Hughes STX Corporation
               Space Physics Data Facility
               Code 632
               NASA Goddard Space Flight Center
               Greenbelt, Maryland 20771
               Phone: (301) 286-8105
               Email: sardi@nssdca.gsfc.nasa.gov

 Data Set Description: Software routines to calculate the positions of
 spacecraft and planets in heliocentric coordinates are maintained by
 NSSDC's Satellite Situation Center (SSC). For the Venus data set here the
 code PLANET was used to calculate solar ecliptic coordinates with respect
 to true equinox and ecliptic of date.  The PLANET executable can be found
 in the SSC anonymous FTP directory NSSDCA::ANON_DIR:[ACTIVE.HELIO]. See the 
 file README.FIRST in that directory for further details. 

 Dataset Parameters:

 YYYY  MM DD  VENAU    SECLAT  SECLON

 Parameter Definition:

 YYYY= year
 MM=   month
 DD=   day of month
 VENAU=   radial distance of Venus from Sun (AU)
 SECLAT= solar ecliptic latitude of Venus (degrees)
 SECLON= solar ecliptic longitude of Venus (degrees)

 Data File: PVOTRJA.asc (only one file of daily values for the mission)

 Related Information and Data:
 
 Further details on the spacecraft, experiment, data sets at NSSDC, and related
 WWW sites can be found on the Pioneer Venus flight project page under

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

 Hour averages of the interplanetary solar wind data from, and hourly heliocentric
 coordinates of, Pioneer Venus and other interplanetary spacecraft may be also
 be accessed and plotted on-line through the COHOWeb service based at the same
 WWW site as above.

 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.