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  Design the Small Agile Satellite. 
  There are two variants. Variant A has 12 hydrazine thrusters, a radar dish
  and a rendezvous camera. Variant B has a telescope and 4 Hall thrusters.
  See also SHELSInterface, NRLArray, PanelFrame, ShapedStrut, PanelWithCutout,
  CompactPCIChassis, XenonTank, XenonTankSupport
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  Components:

  GN&C
  ----
  1 Hall thruster              or 12 hydrazine for variant A
  1 PCU                       
  2 Magnetic torquers         
  1 Xenon tank                
  1 Honeywell RWA Array       
  1 IMU                       
  1 Magnetometer on boom      
  2 Star cameras              
  1 Radar                      for variant A

  Communications
  --------------
  1 ISL                       
  2 Omni antenna              
  1 High gain antenna         

  Payload
  -------
  1 Telescope                  Payload B
  1 Radar dish                 Payload A

  Power
  -----
  1 LiOn battery              
  2 Solarcon arrays           

  Data processing
  ---------------
  1 Ethernet bus              
  1 RAD 750 processor (cPCI)  
  1 Interface board   (cPCI)  
  1 Mass memory board (cPCI)  
  1 Command receiver  (cPCI)  
  1 GPS receiver      (cPCI)  

  Interface
  ---------
  2 Umbilical connectors      
  1 Flange                    

  Structure
  ---------
  Aluminum frame              
  Honeycomb panels            
  
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