NASA Photo ID: STS056-28-020      File Name: 10073217.jpg

Film Type: 35mm CN                Date Taken: 04/17/93

Title: STS-56 onorbit view of Discovery's, OV-103's, payload bay with ATLAS-2 pallet

Description:

During STS-56, the Atmospheric Laboratory for Applications and Science 2 
(ATLAS-2) unpressurized spacelab pallet and its experiment equipment was 
documented in the payload bay (PLB) of Discovery, Orbiter Vehicle (OV) 103.  
ATLAS-2 equipment and instruments include:  port conical scan sensor 
(cylindrical-shaped device at far right); the millimeter-wave atmospheric 
sounder (MAS) antenna (dish-shaped device at pallet center); 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 Shuttle Pointed
Autonomous Research Tool  for Astronomy 201 (SPARTAN-201) is missing as it
was in the midst of  separation from OV-103 when the photo was made.  The
remote manipulator  system (RMS) is deployed from its location on the port
sill longeron.  The  PLB aft bulkhead, the vertical tail, and the orbital
maneuvering system (OMS)  pods are backdropped against the blackness of
space. The moon and a thin blue  line on the Earth's limb can be seen in
the background.