All combos (including combos into Astral) are posted here.
But if you want a short answer, back throw into a corner combo into Astral Heat, any close-ish range 3C combos into astral, and there are certain situations where 623D can combo into astral (namely, when you do it at a proper distance, and you're in the corner, so they're close to you).
EDIT: Derp, I'm too slow. Also, can anyone confirm if forward throw into corner combos into astral? My 360 broke down a few weeks ago, so I haven't been able to test.