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Tom Mazanec
2018-Jul-18, 05:23 PM
Eta Carinae was so bright I imagine its outburst could be seen for megaparsecs.
Have we seen any other examples in this or other galaxies?

glappkaeft
2018-Jul-18, 05:48 PM
Eta Carina is (probably) a Super luminous blue variables and they can become visible at that distance, me and a friend used one of the telescopes at our astronomy clubs observatory to provide data for a paper (Multiple Major Outbursts from a Restless Luminous Blue Variable
in NGC 3432 (https://arxiv.org/abs/1006.0504)) on a LBV outbreak and the distance to NGC 3432 is about 12 Mpc. I believe this is the common method of studying LBV since they are relatively rare.