27-January-2004, 10:56 PM
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Established Member
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Join Date: Jun 2002
Posts: 564
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From this thread Question about visible stars:
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Hipparcos 5926 (V762) in Cassiopeia is 16,308 light-years away but is magnitude 5.84. That's the furthest I know of.
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From the same thread:
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A type 1a supernova with an absolute magnitude of -19.5 would be just visible to the naked eye, mag. 6, at a distance of 4,104,097 light years.
Using m = M + 5log(d) - 5 ( M = absolute magnitude, d is in parsecs (3.26 LY))
You're right, the limit for naked eye visible supernova is within the local group.
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