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Zero Points

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A zero point is defined as the magnitude of an object that would yield 1 ADU/sec at an airmass of 1. They depend on instrument and telescope transmittances as well as detector electronics.

 

Filter Center wavelength (µm)

Zero point magnitude
(for 1 ADU/s)

(Holmes, red)

Zero point magnitude
(for 1 ADU/s)

(Watson, blue)

Sky background
(mag/arcsec)
CH4 H 4% S
 1.578
  20.8
  
CH4 H 4% L
 1.652
21.0
    
H
 1.65
20.5
 20.7
  
Br-gamma
  2.1686 20.1
    

Last update 2008 Sep 02; Markus Hartung