Y2.5V

Thus far I've not seen any objects classified Y2.5 in the literature
(Kirkpatrick20 lists objects with Y2 and Y4 types).

Teff(Y2.5V) = 305 K ; interp Y1V(360K)-Y4V(250K)

W1-W2(Y2.5V) = 5.02 ; Kirkpatrick19 polynomial