atmospheric_refraction¶

simcado.utils.atmospheric_refraction(lam, z0=60, temp=0, rel_hum=60, pres=750, lat=-24.5, h=3064)[source]¶

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

lamfloat, np.ndarray: [um] wavelength bin centres
z0float, optional: [deg] zenith distance. Default is 60 deg from zenith
tempfloat, optional: [deg C] ground temperature. Default is 0 deg C
rel_humfloat, optional: [%] relative humidity. Default is 60%
presfloat, optional: [millibar] air pressure. Default is 750 mbar
latfloat, optional: [deg] latitude. Default set for Cerro Armazones: 24.5 deg South
hfloat, optional: [m] height above sea level. Default is 3064 m

Returns

angfloat, np.ndarray: [arcsec] angle between real position and refracted position

References