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I am learning photometry and I am wondering is the uncorrected extinction instrumental magnitude always less than the corrected extinction instrumental magnitude when applying transformation coefficients?

For example suppose the uncorrected extinction instrumental magnitude is $m^A_V = 10.00,$ will the corrected extinction instrumental magnitude always be greater than $10$?

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  • $\begingroup$ @KornpobBhirombhakdi Comments are not for answers. $\endgroup$ – Rob Jeffries Oct 27 at 19:12
  • $\begingroup$ I used to put short answer in 'answer' and that upset people because it was not long enough. I will leave a long version for others. $\endgroup$ – Kornpob Bhirombhakdi Oct 27 at 19:23
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If an object has a measured brightness, then it's extinction-corrected brightness will always be higher. Hence the extinction-corrected magnitude will always be smaller than the uncorrected (observed) magnitude.

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