@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/43a6ecc5-a1d4-4b89-8d4d-e04a10264ab6> .

<https://gcmd.earthdata.nasa.gov/kms/concept/43a6ecc5-a1d4-4b89-8d4d-e04a10264ab6>
  ns0:resource [ ] ;
  ns0:altLabel [ ] ;
  skos:definition """Spacecraft Brief Description
  The  PAGEOS (Passive Geodetic Earth Orbiting Satellite) spacecraft was
  a  30.48-m inflatable sphere, and had no instrumentation on board.  It
  was  the  second  (following  GEOS  1)  NASA satellite in the National
  Geodetic  Satellites  Program.  PAGEOS 1 was made up of 84 gores and 2
  pole  caps  of  0.0127-mm  aluminized mylar film.  The gores were 48 m
  long  with  maximum  width  of 1.24 m and the pole caps were 1.02 m in
  diameter.   The  primary  purpose  of  the  satellite was to provide a
  tracking  target for geodetic purposes.  It had a specular reflectance
  of  0.862,  and a diffuse reflectance of 0.029, providing a reflecting
  light   source   whose   brightness   was  relatively  independent  of
  observer-satellite-sun   phase   angle.   The  surface  was  also  97%
  reflectant  for microwave energy in the range from 17 to 4E5 kHz.  The
  launch,  orbit,  separation,  inflation  and  initial  operation  were
  nominal,  with  more  than  40  ground  stations  participating in the
  observation  program.  The orbit was generally considered too high for
  drag-density  study,  although  some work was done in this area by the
  Smithsonian   Astrophysical   Observatory.     For   a  more  detailed
  description,  see  David  E.  Bowker,  'PAGEOS  Project Compilation of
  Information  for  Use  of  Experimenter' (TRF B01718), NASA-TM-X-1344,
  1967.
Auxiliary Information
  Launch Date and Time : 1966-06-24 00:14:00
  Epoch Date and Time :  1966-06-24
  Orbit Type :  Geocentric
  Apogee(km) :    4271.
  Perigee(km) :   4207.
  Inclination :   87.14
  Date of last update :  1985-07-17


Group: Platform_Details
   Entry_ID: PAGEOS 1
   Group: Platform_Identification
      Platform_Category: Earth Observation Satellites
      Short_Name: PAGEOS 1
      Long_Name: Passive Geodetic Earth Orbiting Satellite 1
   End_Group
   Group: Synonymous_Platform_Names
      Short_Name: PAGEOS 1
   End_Group
   Group: Orbit
      Orbit_Inclination: 85.40 deg
      Period: 177.10 min
      Perigee: 3,913 km
      Apogee: 4,220 km
   End_Group
   Creation_Date: 2007-11-21
   Online_Resource: http://nssdc.gsfc.nasa.gov/nmc/masterCatalog.do?sc=1966-056A
   Sample_Image: http://celebrating200years.noaa.gov/foundations/satellite_geodesy/pageos_500.jpg
   Group: Platform_Logistics
      Launch_Date: 1966-06-24
      Launch_Site: Vandenberg Air Force Base, USA
      Primary_Sponsor: NASA
   End_Group
End_Group"""@en ;
  skos:prefLabel "PAGEOS 1"@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 .