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Definition

Beginning of Life

BOL

The performance state of a system at the start of its operational lifetime, before any degradation. BOL solar array power is typically 15-30% higher than EOL.

Related terms

Bus

The structural and functional core of a spacecraft that houses and supports the payload and all subsystems. Includes pow...

Budget (Mass/Power/Link)

An accounting of resource allocation across spacecraft subsystems with margins. Mass budgets track weight, power budgets...

Ballistic Coefficient

A measure of how an object's mass and shape resist atmospheric drag, calculated as mass divided by (drag coefficient tim...

Beta Angle

The angle between the orbital plane and the Sun vector. Determines the fraction of an orbit spent in eclipse and drives ...

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