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Definition

Payload

The instrument or system that performs the mission's primary function. For Earth observation: cameras or sensors. For communications: transponders. For science: spectrometers, magnetometers, etc.

Related terms

Mission Lifetime

The planned operational duration of a space mission. Drives design choices for component reliability, radiation hardenin...

Orbit DeterminationOD

The process of estimating a spacecraft's orbit from tracking observations. Uses ground-based radar, GPS, or optical meas...

Perigee

The point in an orbit closest to the central body. For Earth orbits, the lowest altitude above Earth's surface....

Phase Gate

A review milestone where a program's readiness to proceed to the next development phase is evaluated. Standard gates inc...

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