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Neptune is another for me. It's only identifying feature is its excessively intense colour - too blue to be a star or planetary nebula, as it is stellar like in appearance too as it really doesn't have a resolvable disk.
It is currently not too far from Uranus in the sky. Uranus is brighter & with a greenish blue colour & a tiny resolvable disk. It is observable with 50mm binoculars from urban areas as it glows at magnitude 6.
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