Asteroidian (also known as asterian) is a non-binary xenogender in the celestial gender system. Is a gender that is plutoian, juparian, lunettian, and mercurian. Someone who is asteroidian could feel all genders at the same time. Or they may be fluid between them. They may feel different amounts of each gender at different times. Asteroidian can also be considered the demigender form of celestarian.
Asteroidian was not one of the original genders included in the celestial system. It was added in a rework of the system by Tumblr user System-Lgbt, in October of 2018.