[pharmablogger]

Comets sometimes smack into the Sun - the usual effect is burst of particles from the impact site, which then spray out everywhere as the Sun rotates - but it's only ever been recorded "live" once. Asteroids rarely travel in such similar orbits to comets but if one did strike the Sun (and the surface isn't really a surface, just a boundary that marks where the plasma becomes dense enough to be optically opaque) then the effect is likely to be the same.