NASA Photo ID: STS035-28-006       File Name: 10063953.jpg
  Film Type: 35mm                    Date Taken: 12/10/90
  Title: STS-35 ASTRO-1 in OV-102's payload bay silhouetted against RCS firing
  Description:
  STS-35 Astronomy Laboratory 1 (ASTRO-1) telescopes, in onorbit operating 
  position in the payload bay (PLB), are silhouetted against an reaction 
  control system (RCS) right thrustor firing.  Three ultraviolet telescopes
  are  mounted and precisely coaligned on a common structure, called the
  cruciform,  that is attached to the instrument pointing system (IPS).  Here
  the IPS holds  the telescopes in a position that is parallel to the Earth's
  limb below.   Visible on the cruciform are the star tracker (S TRK) (silver
  cone at the  top), the Ultraviolet Imaging Telescope (UIT) (behind S TRK),
  and the Hopkins  Ultraviolet Telescope (HUT).               
  
  Subject terms:
  ASTRO MISSIONS (STS)                    
  COLUMBIA (ORBITER)                      
  EARTH LIMB                              
  FIRING (IGNITING)                       
  INSTRUMENT ORIENTATION                  
  ORBIT MANEUVERING ENGINE (SPACE SHUTTLE)
  PAYLOAD BAY                             
  POSITIONING                             
  SPACEBORNE ASTRONOMY                    
  STS-35                                  
  THRUST CONTROL                          
  ULTRAVIOLET TELESCOPES                  
  

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