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Magnitudes next up previous
Next: Sky Brightness Up: Part IV Extragalactic Astronomy Previous: Signal-to-Noise Ratio

Magnitudes

Each magnitude is a factor of 2.51 in luminosity. The wavebands are defined by filters, of which a bewildering variety exist; these numbers are approximations to the most commonly used bands.

             
Band Central Width Flux of Zero
  Wavelength (nm) (nm) Magnitude Star ( W m-2nm-1)
      old (Caltech) (UKIRT) (Bessell)
             
             
U 365 70 3.0 x 10-11 ... ... 4.175 x 10-11
B 440 100 7.2 x 10-11 ... ... 6.32 x 10-11
V 550 90 3.9 x 10-11 3.39 x 10-11 3.631 x 10-11
R 700 220 1.6 x 10-11 1.76 x 10-11 ... 2.177 x 10-11
I 880 240 8.9 x 10-12 8.33 x 10-12 ... 1.126 x 10-11
J 1300 240 2.8 x 10-12 3.21 x 10-12 3.07 x 10-12 3.147 x 10-12
H 1600 240 1.3 x 10-12 1.08 x 10-12 1.12 x 10-12 1.138 x 10-12
K 2100 350 4.6 x 10-13 3.84 x 10-13 4.07 x 10-13 3.961 x 10-13
             


next up previous
Next: Sky Brightness Up: Part IV Extragalactic Astronomy Previous: Signal-to-Noise Ratio
Paul Francis
1999-03-09