General terms:
* Orbital spacecraft: This emphasizes its intended function of orbiting a celestial body.
* Non-landing spacecraft: This is a straightforward, descriptive term.
* Flyby spacecraft: This specifically refers to a spacecraft that passes by a celestial body without entering its orbit.
* Space probe: This term is often used for spacecraft that study celestial bodies from a distance.
More specific terms:
* Observatory spacecraft: This is used for spacecraft designed to observe celestial objects or phenomena.
* Communications satellite: This refers to a spacecraft that transmits and receives signals for communication purposes.
The best term to use will depend on the specific context and the function of the spacecraft.
