scopesim.effects.shifts.atmospheric_refraction#

scopesim.effects.shifts.atmospheric_refraction(lam, z0=60, temp=0, rel_hum=60, pres=750, lat=-24.5, h=3064)#

Compute atmospheric refraction.

The function computes the angular difference between the apparent position of a star seen from the ground and its true position.

Parameters:

lam (float, np.ndarray) – [um] wavelength bin centres
z0 (float, optional) – [deg] zenith distance. Default is 60 deg from zenith
temp (float, optional) – [deg C] ground temperature. Default is 0 deg C
rel_hum (float, optional) – [%] relative humidity. Default is 60%
pres (float, optional) – [millibar] air pressure. Default is 750 mbar
lat (float, optional) – [deg] latitude. Default set for Cerro Armazones: 24.5 deg South
h (float, optional) – [m] height above sea level. Default is 3064 m

Returns:

ang – [arcsec] angle between real position and refracted position

Return type:

float, np.ndarray

References

scopesim.effects.shifts.atmospheric_refraction