|
gptkbp:instance_of
|
gptkb:satellite
|
|
gptkbp:analysis
|
ongoing
|
|
gptkbp:application
|
gptkb:space_exploration
ongoing efforts
|
|
gptkbp:collaboration
|
yes
|
|
gptkbp:collaborations
|
universities
|
|
gptkbp:collaborator
|
gptkb:University_of_California
|
|
gptkbp:collection
|
remote sensing
magnetic field data
|
|
gptkbp:community
|
NASA scientists
|
|
gptkbp:contribution
|
magnetosphere studies
|
|
gptkbp:data_transmission
|
radio signals
|
|
gptkbp:data_type
|
digital
scientific data
|
|
gptkbp:data_usage
|
gptkb:academic_research
various fields
10 MHz
|
|
gptkbp:decommissioned
|
1967-12-31
|
|
gptkbp:funding
|
NASA budget
|
|
gptkbp:historical_interpretation
|
gptkb:complex
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Explorer 21
|
|
gptkbp:impact
|
gptkb:significant
high
|
|
gptkbp:innovation
|
new technologies
|
|
gptkbp:instruments
|
gptkb:magnetometer
|
|
gptkbp:is_considered
|
peer-reviewed
|
|
gptkbp:launch_date
|
gptkb:1965
1965-02-25
|
|
gptkbp:launch_mass
|
150 kg
|
|
gptkbp:launch_site
|
gptkb:Cape_Canaveral
|
|
gptkbp:launch_vehicle
|
Delta D
|
|
gptkbp:legacy
|
contributed to understanding of magnetosphere
|
|
gptkbp:manufacturer
|
gptkb:NASA
|
|
gptkbp:mass
|
150 kg
|
|
gptkbp:mission
|
gptkb:1967
Earth science
successful
technical issues
NASA archives
successful mission review
planned decommissioning
|
|
gptkbp:mission_duration
|
2 years
|
|
gptkbp:mission_type
|
gptkb:scientific_research
|
|
gptkbp:modern_relevance
|
current research
|
|
gptkbp:notable_mission
|
important for space science
|
|
gptkbp:notable_work
|
magnetic field variations
|
|
gptkbp:objective
|
study Earth's magnetosphere
|
|
gptkbp:operational_status
|
decommissioned
|
|
gptkbp:operational_use
|
2 years
|
|
gptkbp:orbit_type
|
low Earth orbit
|
|
gptkbp:orbital_inclination
|
30 degrees
|
|
gptkbp:orbital_period
|
yes
90 minutes
|
|
gptkbp:partnerships
|
gptkb:international_partners
|
|
gptkbp:power_source
|
solar panels
|
|
gptkbp:product_quality
|
high
|
|
gptkbp:provides_information_on
|
public access
open access
|
|
gptkbp:publication
|
gptkb:academic_journals
|
|
gptkbp:reign
|
90 minutes
|
|
gptkbp:research
|
empirical research
|
|
gptkbp:research_focus
|
gptkb:space_weather
|
|
gptkbp:research_output
|
enhanced understanding of space environment
|
|
gptkbp:scientific_goals
|
measure magnetic fields
|
|
gptkbp:scientific_instruments
|
fluxgate magnetometer
|
|
gptkbp:status
|
re-entered atmosphere
|
|
gptkbp:storage
|
onboard memory
|
|
gptkbp:student_enrollment
|
long-term
|
|
gptkbp:successor
|
gptkb:Explorer_22
|
|
gptkbp:bfsParent
|
gptkb:Explorer_1
|
|
gptkbp:bfsLayer
|
4
|