I don't think we can answer that as we are seeing fainter and fainter stars as technologies improve. The Hubble Space telescope showed stars never seen before but I am sure there are even fainter ones that we might see with new technologies one day.
Deneb is the dimmest star in Cygnus.
Gliese 229 is the dimmest star in the constellation Lepus
dimmest stars in aquarius
Castor
Kappa
Algol is in the constellation Perseus.
Beta and Alpha Herculis are both 2nd Magnitude (2.78) stars
Perseus is a constellation containing many stars but they are at very different distances. A constellation is a collection of stars in roughly similar directions, nothing else.
the star that is the dimmest is above
The dimmest star is Orion is HD 37605 with an apparentmagnitude of 8.69
Twin dwarfs referred as 2M0939 is the dimmest star known
Algol is a bright three-star system that is part of the constellation Perseus. Other names for Algol are Demon Star, Gorgona, and El Ghoul.