r0_wl_zen

lsst.ts.imsim.utils.r0_wl_zen(r0_in_m_ref: float, zen: int, wl_um: float) → float

Get the atomosphere reference r0, which is a function of zenith angle and wavelength.

Parameters

r0_in_m_reffloat

Reference r0 in meter at the wavelength of 0.5 um.

zenfloat

Telescope zenith angle in degree.

wl_umfloat

Wavelength in um.

Returns

float

Atomosphere reference r0 in meter.