Wiktionary
circumplanetary
a. (context astronomy English) Surrounding a planet
Usage examples of "circumplanetary".
It has a weaker magnetic field and radiation belt than Jupiter and a more spectacular set of circumplanetary rings.
Clube have proposed that a number of the moons, asteroids, comets and circumplanetary rings in the solar system once freely wandered in interstellar space until they were captured as the Sun plunged through the Orion spiral arm.
Grenesect asked him who he thought would win that year's circumplanetary air race.
Since the patterns of winking on and off were the same before and after occultation, this finding (and much subsequent work) has led to the discovery of nine very thin, very dark circumplanetary rings, giving Uranus the appearance of a bull's-eye in the sky.