active asteroid
bodies orbiting within the main asteroid belt which have shown cometary activity during part of their orbit
en-GB/ˈæktɪv ˈɑːstəˌɹɔɪd/
en-US/ˈæktɪv ˈæstɚˌɔɪd/
bodies orbiting within the main asteroid belt which have shown cometary activity during part of their orbit