@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix ns0: <http://gcmd.gsfc.nasa.gov/kms#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/3466eed1-2fbb-49bf-ab0b-dc08731d502b>
  skos:prefLabel "Earth Observation Satellites"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/5753c582-923c-4b37-9985-c2dc006c6337> .

<https://gcmd.earthdata.nasa.gov/kms/concept/5753c582-923c-4b37-9985-c2dc006c6337>
  ns0:resource [ ] ;
  skos:definition """- Spacecraft Brief Description -
This satellite was a part of Japan's contribution to the International
Magnetospheric Study. The mission objectives were to observe the aurora
borealis, study aurora-related phenomena, and study the ionosphere and
magnetosphere. The main body of the spacecraft was a cylinder 0.946 m in
diameter with shallow truncated cones attached at both ends. Most of the
surface was covered with solar cells that produced 35 W. Two booms of roughly
1.9 m each extended outward from the equator of the main body. At the tip of
each boom was a permanent magnet to provide alignment of the spacecraft center
axis along the local geomagnetic field line. Two sets of circularly polarized
quadrupole antennas, one for UHF (400 MHz) and another for VHF, extended from
opposite ends of the spacecraft. The VHF antenna was diplexed for telemetry
(136 MHz) and command (148 MHz). Other attitude sensors included a vector
magnetometer and a solar sensor. The spacecraft contained a tape recorder to
store 160 min of data at 512 bps or 40 min at 2048 bps, with readout in 10 min
at 8192 bps. Besides the solar cells, there was a nickel-cadmium battery for
nighttime operation.
                  - Auxiliary Information -
    Launch Date and Time :  1978-02-04 07:00:00
    Epoch Date and Time  :  1978-02-06
    Apogee (km or AU):      3978.
    Perigee (km or AU):     642.
    Inclination (degree) :  65.4
    Orbit Type :            Geocentric
    Information last updated on 1991-11-15


Group: Platform_Details
   Entry_ID: EXOS-A
   Group: Platform_Identification
      Platform_Category: Earth Observation Satellites
      Short_Name: EXOS-A
   End_Group
   Group: Synonymous_Platform_Names
      Short_Name: EXOS-A
   End_Group
   Group: Orbit
      Orbit_Inclination: 65.4 deg
      Perigee: 642 km
      Apogee: 3978 km
   End_Group
   Creation_Date: 2007-11-19
   Online_Resource: http://www.oma.be/sevem/EXOS-A.html
   Sample_Image: http://edu.jaxa.jp/materialDB/display/large-67262.jpg
   Group: Platform_Logistics
      Launch_Date: 1978-02-04
      Launch_Site: Uchinoura Space Center, Japan
      Primary_Sponsor: JAXA
   End_Group
End_Group"""@en ;
  skos:prefLabel "EXOS-A"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/platforms> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/3466eed1-2fbb-49bf-ab0b-dc08731d502b> ;
  a skos:Concept .