I think that it would either be 4, alphas, or 8, alphas+betas. The trolls didn’t actually go through their door, yet we have their constellations. Also, the frog forms before anyone can even go through the door, so maybe it’s just predetermined to be constellations based on the players of the session.

Oh that’s true, they didn’t go through! So likely a 8-Constellation Earth, although Kanaya, Karkat, Terezi and Callie could still be possibly included.