Claim: The 24 Sextantis (7th-magnitude star) can only be viewed from rural skies under good seeing conditions and previously it was an A-type main sequence star before using up the hydrogen at its core.
Evidence: 24 Sextantis, often abbreviated as 24 Sex, is the Flamsteed designation of a 7th-magnitude star located approximately 236 light years away in the constellation of Sextans. At an apparent visual magnitude of 6.61, this star can only be viewed from rural skies under good seeing conditions. Previously it was an A-type main sequence star before using up the hydrogen at its core.