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IMP 8

ResourceID
spase://CNES/Observatory/CDPP-AMDA/IMP8

Description

IMP 8 (IMP-J or Explorer 50), the last satellite of the IMP series, was a drum-shaped spacecraft, 135.6 cm across and 157.4 cm high, instrumented for interplanetary and magnetotail studies of cosmic rays, energetic solar particles, plasma, and electric and magnetic fields. Its initial orbit was more elliptical than intended, with apogee and perigee distances of about 45 and 25 earth radii. Its eccentricity decreased after launch. Its orbital inclination varied between 0 deg and about 55 deg with a periodicity of several years. The spacecraft spin axis was normal to the ecliptic plane, and the spin rate was 23 rpm. The data telemetry rate was 1600 bps.
The spacecraft was in the solar wind for 7 to 8 days of every 12.5 day orbit. Telemetry coverage was 90% in the early years, but only 60-70% through most of the 1980's and early 1990's. Coverage returned to the 90% range in the mid to late 1990's.
The objectives of the extended IMP-8 operations were to provide solar wind parameters as input for magnetospheric studies and as a 1-AU baseline for deep space studies, and to continue solar cycle variation studies with a single set of well-calibrated and understood instruments.
In October, 2001, IMP 8 was terminated as an independent mission. Telemetry acquisition resumed after about three months at Canberra only (30-50% coverage), as an adjunct to the Voyager and Ulysses missions. As of August 2005 IMP 8 continued in this mode.

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Details

Version:2.4.1

Observatory

ResourceID
spase://CNES/Observatory/CDPP-AMDA/IMP8
ResourceHeader
ResourceName
IMP 8
AlternateName
IMP-J
AlternateName
Explorer 50
AlternateName
1973-078A
ReleaseDate
2010-09-27 18:45:12Z
Description

IMP 8 (IMP-J or Explorer 50), the last satellite of the IMP series, was a drum-shaped spacecraft, 135.6 cm across and 157.4 cm high, instrumented for interplanetary and magnetotail studies of cosmic rays, energetic solar particles, plasma, and electric and magnetic fields. Its initial orbit was more elliptical than intended, with apogee and perigee distances of about 45 and 25 earth radii. Its eccentricity decreased after launch. Its orbital inclination varied between 0 deg and about 55 deg with a periodicity of several years. The spacecraft spin axis was normal to the ecliptic plane, and the spin rate was 23 rpm. The data telemetry rate was 1600 bps.
The spacecraft was in the solar wind for 7 to 8 days of every 12.5 day orbit. Telemetry coverage was 90% in the early years, but only 60-70% through most of the 1980's and early 1990's. Coverage returned to the 90% range in the mid to late 1990's.
The objectives of the extended IMP-8 operations were to provide solar wind parameters as input for magnetospheric studies and as a 1-AU baseline for deep space studies, and to continue solar cycle variation studies with a single set of well-calibrated and understood instruments.
In October, 2001, IMP 8 was terminated as an independent mission. Telemetry acquisition resumed after about three months at Canberra only (30-50% coverage), as an adjunct to the Voyager and Ulysses missions. As of August 2005 IMP 8 continued in this mode.

Contacts
RolePersonStartDateStopDateNote
1.ProjectScientistspase://SMWG/Person/Robert.E.McGuire
InformationURL
Name
IMP-8 Project Information
URL
InformationURL
Name
NSSDC's Master Catalog
URL
Description

Information about the IMP-J mission

PriorIDs
spase://vspo/observatory/63
ObservatoryGroupID
Location
ObservatoryRegion
Earth.Magnetosphere
ObservatoryRegion
Heliosphere.NearEarth
ObservatoryRegion
Earth.Magnetosheath
ObservatoryRegion
Earth.Magnetosphere.Magnetotail
OperatingSpan
StartDate
1973-10-26 00:00:00
StopDate
2006-10-30 00:00:00