What does orbiter mean?
An orbiter is a spacecraft, satellite, or instrument designed to travel in orbit around a planet, moon, or other astronomical body. Unlike a vehicle that makes a single flyby, an orbiter may remain in orbit for an extended period, repeatedly passing over the same regions and conducting observations or relaying communications. The word is especially common in discussions of lunar, planetary, and space missions, including orbiters that photograph surfaces, study atmospheres, search for signs of life, or support landers and rovers. In broader technical language, it can refer to a device that follows an orbital path. The term comes from orbit and the suffix -er, indicating an agent or device that performs the associated action.
nounAn artificial spacecraft or satellite designed to travel in orbit around a planet, moon, or other astronomical body. The term can also refer more generally to a device or object that moves in orbit.
- An artificial spacecraft or satellite designed to orbit a planet, moon, or other astronomical body.
- A device or object that travels in orbit, especially a component or instrument placed in an orbital path.
"The spacecraft entered orbit around Mars and became the planet's first long-term orbiter."
"The orbiter mapped the planet's magnetic field and collected samples of its atmosphere."
"The rover communicated with the orbiter, which relayed the data back to Earth."
The plural is orbiters.
"Several orbiters are being planned to study the outer planets."
While some spacecraft make one brief pass, an orbiter can circle a distant world for years, turning it into a mobile laboratory.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does orbiter come from?
The word was formed in the 20th century by adding the agentive suffix -er to orbit. Orbit ultimately derives from Latin orbita, meaning a circular path or course, from orbis, a circle or ring. The same Latin root is reflected in English words such as orb and orbital.
Related word forms
How orbiter is actually used
The term is most common in space science and aerospace contexts. It generally implies a vehicle or device specifically intended for orbital flight, although it can also be used for any object that follows an orbit.
Easily confused with orbiter
An orbiter is a spacecraft that travels around another astronomical body, while satellite is a broader term for an object placed in orbit around Earth or another body.