When a comet is at perihelion does it have a brighter tail?
The comets are mostly Ice and gas in the form of ice.
When it is nearest to Sun due to heat the tail should be largest. and brightest. But it depend upon what type o gases and dust is in the nucleus. and how much sublimation n takes place.But different chemicals get sublimed at different temperatures and comet may have already lost its material then tail may not be bright at perihelion. Also angle of tail visible from earth changes as earth's positron at that time..