@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/14b369b6-19d4-41fe-b1bc-27807ecb666d>
  skos:prefLabel "ATS (Advanced Technology Satellite)"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/cb8e56df-863a-41a6-a389-237a9725ae8b> .

<https://gcmd.earthdata.nasa.gov/kms/concept/cb8e56df-863a-41a6-a389-237a9725ae8b>
  ns0:altLabel [ ] ;
  skos:definition """ATS 4 was launched in August 1968 and was a gravity-gradient-stabilized
spacecraft designed to (1) test new concepts in spacecraft design, propulsion,
and stabilization, (2) take high-quality cloud cover pictures, (3) provide in
situ measurements of the aerospace environment, and (4) test improved
communication systems while in earth-synchronous orbit.  The
cylindrically-shaped spacecraft measured 142 cm in diameter and 183 cm in
length.  The primary structural members were a corrugated thrust tube with
honeycombed bulkheads secured to each end.  Equipment components and payload
were externally mounted on the outer surface of the thrust tube as well as on a
structure that slid into the interior of the thrust  tube.  Electric power was
provided by two solar arrays mounted on either end of the spacecraft's outer
shell and by two rechargeable nickel-cadmium batteries.  Extending radially
outward from the side of the spacecraft were four 28.2 m adjustable
gravity-gradient booms.   The spacecraft telemetry system consisted of four
2.1-W transmitters, (two at 136.47 MHz and two at 137.35 MHz), in addition to a
microwave  communications  experiment.

This satellite featured an image orthicon (day/night) camera for the purpose of
determining the feasibility of simultaneous day/night imaging of cloud cover
patterns from an earth-synchronous spacecraft.  The second stage of the launch
vehicle failed to to ignite, and the planned synchronous orbit was not
achieved.  The spacecraft and its Centaur booster rocket were left attached
together in a parking orbit. In spite of the anomalistic attitude, some of the
experiments did perform successfully before the satellite and its attached
rocket booster reentered the earth's atmosphere on October 17, 1968.  The
primary objective of inserting a gravity-gradient-stabilized spacecraft into a
geosynchronous orbit was not accomplished.


Group: Platform_Details
   Entry_ID: ATS-4
   Group: Platform_Identification
      Platform_Category: Earth Observation Satellites
      Platform_Series_or_Entity: ATS (Advanced Technology Satellite)
      Short_Name: ATS-4
      Long_Name: Advanced Technology Satellite-4
   End_Group
   Creation_Date: 2007-08-29
   Online_Resource: http://www.astronautix.com/craft/ats4.htm
   Group: Platform_Logistics
      Launch_Date: 1968-08-10
      Primary_Sponsor: NASA
   End_Group
End_Group"""@en ;
  skos:prefLabel "ATS-4"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/platforms> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/14b369b6-19d4-41fe-b1bc-27807ecb666d> ;
  a skos:Concept .