Space and Solar Definitions - O
One-way - Communications mode consisting only of downlink received from a spacecraft.
Oort cloud - A large number of comets theorized to orbit the sun in the neighborhood of 50,000 AU.
OPCT - Operations Planning and Control Team at JPL, "OPSCON." Obsolete, replaced by DSOT, Data Systems Operations Team.
OPNAV - Optical Navigation (images).
OSI - ISO's Open Systems Interconnection protocol suite.
OSR - Optical Solar Reflector, thermal control component onboard a spacecraft.
OSSA - Office Of Space Science and Applications, NASA.
OTM - Orbit Trim Maneuver, spacecraft propulsive maneuver.
OWLT - One-Way Light Time, elapsed time between Earth and spacecraft or solar system body.
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