Hmm, could've sworn it was hidden somewhere in there near the aasimar class level, my bad. Shouldn't be too hard to put it together real quick using the half-fiend as a guideline:
Half-Celestial Template Class
1st * Con +2, Cha +2, natural armor +1, darkvision 60ft., daylight (as the spell) 3/day, outsider type, spell-like abilities
2nd ** Str +2, Dex +2, disease immunity, +4 Fort saves against poison, resistances (acid 5, cold 5, electricity 5), spell resistance (lesser), spell-like abilities
3rd *** Str +2, Wis +2, Cha +2, daylight (as the spell) at will, damage reduction, smite evil, spell-like abilities
4th *** Con +2, Int +2, Wis +2, resistances (acid 10, cold 10, electricity 10), spell resistance (greater), spell-like abilities, wings
I'll have to spend some more time working up the minimum half-celestial levels and minimum character levels for determining access to spell-like abilities for the template class though.