Differential Atmospheric Refraction

Differential Atmospheric Refraction at an Altitude of 2KM relative to a reference wavelength of 5000A

Sec Z 3000A 3500A 4000A 4500A 5000A 5500A 6000A 6500A
1.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1.05 0.68 0.38 0.20 0.08 0.00 -0.06 -0.11 -0.14
1.10 0.97 0.55 0.29 0.12 0.00 -0.09 -0.15 -0.20
1.15 1.20 0.68 0.36 0.15 0.00 -0.11 -0.19 -0.25
1.20 1.40 0.80 0.42 0.17 0.00 -0.13 -0.22 -0.30
1.25 1.59 0.90 0.48 0.20 0.00 -0.14 -0.25 -0.33
1.30 1.76 1.00 0.53 0.22 0.00 -0.16 -0.28 -0.37
1.35 1.92 1.09 0.58 0.24 0.00 -0.17 -0.30 -0.40
1.40 2.07 1.18 0.62 0.26 0.00 -0.19 -0.33 -0.44
1.45 2.22 1.26 0.67 0.28 0.00 -0.20 -0.35 -0.47
1.50 2.37 1.34 0.71 0.29 0.00 -0.21 -0.37 -0.50
1.55 2.51 1.42 0.75 0.31 0.00 -0.23 -0.40 -0.53
1.60 2.64 1.50 0.80 0.33 0.00 -0.24 -0.42 -0.56
1.65 2.78 1.58 0.84 0.34 0.00 -0.25 -0.44 -0.59
1.70 2.91 1.65 0.88 0.36 0.00 -0.26 -0.46 -0.61
1.75 3.04 1.73 0.92 0.38 0.00 -0.27 -0.48 -0.64
1.80 3.17 1.80 0.95 0.39 0.00 -0.29 -0.50 -0.67
1.85 3.29 1.87 0.99 0.41 0.00 -0.30 -0.52 -0.69
1.90 3.42 1.94 1.03 0.42 0.00 -0.31 -0.54 -0.72
2.00 3.54 2.01 1.07 0.44 0.00 -0.32 -0.56 -0.75
2.05 3.67 2.08 1.10 0.45 0.00 -0.33 -0.58 -0.77
2.10 3.91 2.22 1.18 0.48 0.00 -0.35 -0.62 -0.82
2.20 4.15 2.36 1.25 0.51 0.00 -0.37 -0.66 -0.87
2.30 4.38 2.49 1.32 0.54 0.00 -0.40 -0.69 -0.92
2.40 4.62 2.62 1.39 0.57 0.00 -0.42 -0.73 -0.97

 

Sec Z 7000A 7500A 8000A 8500A 9000A 9500A 10000A
1.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
1.05 -0.17 -0.19 -0.21 -0.23 -0.24 -0.25 -0.26
1.10 -0.24 -0.28 -0.30 -0.32 -0.34 -0.36 -0.37
1.15 -0.30 -0.34 -0.38 -0.40 -0.42 -0.44 -0.46
1.20 -0.35 -0.40 -0.44 -0.47 -0.50 -0.52 -0.54
1.25 -0.40 -0.45 -0.50 -0.53 -0.56 -0.59 -0.61
1.30 -0.44 -0.50 -0.66 -0.59 -0.62 -0.65 -0.67
1.35 -0.48 -0.55 -0.60 -0.64 -0.68 -0.71 -0.73
1.40 -0.52 -0.59 -0.65 -0.69 -0.73 -0.77 -0.79
1.45 -0.56 -0.63 -0.69 -0.74 -0.79 -0.82 -0.85
1.50 -0.60 -0.68 -0.74 -0.79 -0.84 -0.87 -0.91
1.55 -0.63 -0.72 -0.78 -0.84 -0.89 -0.93 -0.96
1.60 -0.67 -0.75 -0.83 -0.88 -0.93 -0.98 -1.01
1.65 -0.70 -0.79 -0.87 -0.93 -0.98 -1.03 -1.06
1.70 -0.73 -0.83 -0.91 -0.97 -1.03 -1.07 -1.11
1.75 -0.77 -0.87 -0.95 -1.02 -1.07 -1.12 -1.16
1.80 -0.80 -0.90 -0.99 -1.06 -1.12 -1.17 -1.21
1.85 -0.83 -0.94 -1.03 -1.10 -1.16 -1.22 -1.26
1.90 -0.86 -0.98 -1.07 -1.14 -1.21 -1.26 -1.31
2.00 -0.89 -1.01 -1.11 -1.19 -1.25 -1.31 -1.36
2.05 -0.92 -1.05 -1.15 -1.23 -1.30 -1.35 -1.40
2.10 -0.99 -1.12 -1.22 -1.31 -1.38 -1.44 -1.50
2.20 -1.05 -1.18 -1.30 -1.39 -1.47 -1.53 -1.59
2.30 -1.11 -1.25 -1.37 -1.47 -1.55 -1.62 -1.68
2.40 -1.16 -1.32 -1.44 -1.55 -1.63 -1.70 -1.77

Notes:

1. Sec Z is essentially equal to air mass over this range.
2. The CFADC can correct for atmospheric dispersion up to Sec Z=2.4 (65 degrees zenith angle)
3. The useful short wavelength limit of the Hydra corrector is 3350A
4. Source of this table: ESO