<p>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.</p>

CC BY-SA 4.0
2020-10-27T08:35:55.420Z
2020-10-27T09:37:09.830Z
2020-10-27T09:37:09.830Z
ProfRob
<p>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?</p>
<p>For example suppose the uncorrected extinction instrumental magnitude is <span class="math-container">$m^A_V = 10.00,$</span> will the corrected extinction instrumental magnitude always be greater than <span class="math-container">$10$</span>?</p>

CC BY-SA 4.0
2020-10-27T19:12:47.940Z
@KornpobBhirombhakdi Comments are not for answers.
ProfRob
CC BY-SA 4.0
2020-10-27T19:23:42.720Z
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.
Kornpob Bhirombhakdi
<observational-astronomy><photometry>
Photometry extinction correction magnitude
Robin
# Photometry extinction correction magnitude

(Asked by: username_0 on 2020-10-27)

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 $10$?

**Tags:** observational-astronomy, photometry
> **Comments:**
> **username_1**: @KornpobBhirombhakdi Comments are not for answers.  
> **username_2**: 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.  

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## 1 answers

### Answer by username_1 on 2020-10-27. Score: 1 | Accepted answer

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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