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If it is an infrared magnitude, then it is useless for comparison with the visually observed brightness of the SN.
Not that I would be too hard on anyone who erroneously compared two different types of magnitude....we are all amateurs, who love our hobby, but the limited amount of time we usually have available for astronomy means that we are usually 100% competent only in a narrow field within the vast science of astronomy.
[[ While I myself tend to be "technically competent" when it comes to magnitudes and galaxy structures, as I do read some scientific papers, it could still happen that I make a conceptual error...... simply because I have acquired what I know "in bits and pieces" instead of through a formal course of study. ]]
Last edited by madbadgalaxyman; 26-10-2011 at 12:34 PM.
Reason: typo
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