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Voyager 1 Interplanetary SEDR Ephemeris Data, ASCII


Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)

Time span: 1977-09-05 to 2029-12-31


This ASCII collection contains selected Voyager 1 interplanetary ephemeris parameters extracted by the MIT Plasma Science (PLS) experiment team from the binary Spacecraft Experimenter Data Record (SEDR) files provided to all Voyager experiment teams by the Voyager Project at the NASA Jet Propulsion Laboratory. Each ASCII file of filename V1_SEDR_yyyy.ASC, where yyyy is the year, includes one year of data at varying intervals from hours to days. The files give the coordinates of the spacecraft in the following column order: year, day, hour, minute, second, millisecond, x, y, z, xx, yy, zz, r, latitude, longitude, and time. The parameters are defined as follows: x, y, z are Solar ECliptic (SEC) cartesian coordinates in AU units; xx, yy, zz are Solar EQuatorial (SEQ) cartesian coordinates in AU units; r, latitude, longitude are the Solar EQuatorial (SEQ) spherical radius and angles in AU and degrees; time is in years since 1900. These data have been obtained from the MIT Plasma Group's anonymous FTP site at pub/plasma.

The data are available on-line at:

Alternate Names

  • Interplan SEDR Ephemeris, ASCII
  • SPDF0864


  • Ancillary: Ephemeris/Orbit/Attitude


  • 77-084A-00G

Additional Information



Questions and comments about this data collection can be directed to: Dr. John F. Cooper



NameRoleOriginal AffiliationE-mail
Dr. John W. BelcherData ProviderMassachusetts Institute of
Dr. John W. BelcherGeneral ContactMassachusetts Institute of
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