<p>How can I derive limit magnitude in 5sigma/2arcsec ?</p>
<p>I have the limit magnitude in 5sigma which derive from the magnitude with SNR reach 5.
But I can not understand what the meaning of dividing 2arcsec.</p>

CC BY-SA 4.0
2020-10-15T16:14:53.997Z
Do you mean arcsec^2 ?
Mike G
CC BY-SA 4.0
2020-10-18T05:56:43.737Z
No, just 2arcsec. May it means the diameter.
GHC
<observational-astronomy><magnitude><image-processing>
Limit Magnitude divide 2 arcsec
GHC
# Limit Magnitude divide 2 arcsec

(Asked by: username_0 on 2020-10-15)

How can I derive limit magnitude in 5sigma/2arcsec ?

I have the limit magnitude in 5sigma which derive from the magnitude with SNR reach 5.
But I can not understand what the meaning of dividing 2arcsec.

**Tags:** observational-astronomy, magnitude, image-processing

> **Comments:**
> **username_1**: Do you mean arcsec^2 ?  
> **username_0**: No, just 2arcsec. May it means the diameter.  

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## 0 answers

