As I have used it in Sci-Fi concepts within my own stuff, I have used the phrase:
Gravitically significant.
If something does not possess enough gravity (due to mass) to be orbited, then it is not gravitically significant.
Depending on usage, this could be a fuzzy definition. Some starships (in my stuff) generate enough gravity to disturb star systems, and are gravitically significant. But, to an astronaut on an asteroid, the astroid is gravitically significant. The asteroid to the star system, is not.