NASA Photo ID: STS056-154-107      File Name: 10073215.jpg
  Film Type: 4x5                     Date Taken: 04/17/93
  Title: STS-56 Discovery, OV-103, payload bay (PLB) with ATLAS-2 pallet & SPARTAN-201
  Description:
  During STS-56 with Discovery, Orbiter Vehicle (OV) 103, in an atmospheric 
  monitoring attitude, the Atmospheric Laboratory for Applications and
  Science  2 (ATLAS-2) unpressurized spacelab pallet and the mission peculiar
  support  structure (MPESS)-mounted Shuttle Pointed Autonomous Research Tool
  for  Astronomy 201 (SPARTAN-201) are visible in the payload bay (PLB). 
  ATLAS-2  equipment and instruments include: the igloo (center foreground,
  only the  top visible); the inverters and pump package (far right); port
  conical scan  sensor (adjacent to pump package at far right); the
  millimeter-wave  atmospheric sounder (MAS) antenna (dish-shaped device at
  pallet center) with  ATMOS recorder underneath it; the starboard conical
  scan sensor (small  cylinder at far left); and the atmospheric trace module
  spectroscopy (ATMOS)  (box behind conical sensor at far left).  Smaller
  ATLAS-2 instruments located  in the center of the pallet include (left to
  right): Active Cavity Radiometer  Irradiance Monitor (ACRIM or ACR); Solar
  Constant Instrument (SOLCON); Solar  Spectrum Instrument (SOLSPEC); and MAS
  (large box just below antenna).  The  SPARTAN-201 is visible behind and
  above the ATLAS-2 pallet.  SPARTAN-201 will  be released during the mission
  into a freeflying period and returned to its  stowage area for return to
  Earth.  Remote manipulator system (RMS) arm (out  of frame) is deployed
  from its position on the port sill longeron. Partially  visible in the
  foreground (left) is the lid of the shuttle solar backscatter  ultraviolet
  (SSBUV) canister.  OV-103's vertical tail points to the  cloud-covered
  surface of the Earth below.
  
  Subject terms:
  ATMOSPHERIC PHYSICS                     
  CLOUDS                                  
  DISCOVERY (ORBITER)                     
  EARTH ATMOSPHERE                        
  EARTH LIMB                              
  PALLETS                                 
  PAYLOAD BAY                             
  SOLAR PHYSICS                           
  SPACE SHUTTLE PAYLOADS                  
  SPACEBORNE ASTRONOMY                    
  SPACEBORNE EXPERIMENTS                  
  SPARTAN SATELLITES                      
  STS-56                                  
  TAIL ASSEMBLIES                         
  

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