sky-bkg

Description

Two sources of sky background are considered:

• Zodiacal light
• Earth shine

Zodiacal light

Zodiacal light varies as a function of angular distance of the target from the Sun and from the ecliptic. We adopt data in Leinert et al. (1998).

Earth-shine

Earth-shine varies strongly as a function of angle between the target and the Earth lime. We adopt data from Figure 9.1 in HST/WFC3 instrument handbook.

Installation

via pip:

pip install sky-bkg

Usage

from sky_bkg import sky_bkg

ra = 150
dec = 45
time = '2019-07-01'
zodi_wave, zodi_flux = sky_bkg.zodiacal(ra, dec, time)

theta = 40
earth_wave, earth_flux = sky_bkg.earthshine(theta)

References

• The night sky brightness in general and for the zodiacal light in Leinert et al. 1998 A&AS, 127, 1.
• Sky background from WFC3 document (https://hst-docs.stsci.edu/wfc3ihb/chapter-9-wfc3-exposure-time-calculation/9-7-sky-background)
• The solar spectrum is from Colina et al. 1996, download from https://cads.iiap.res.in/tools/zodiacalCalc/Documentation