refraction¶
- lsst.afw.coord.refraction(wavelength, elevation, observatory, weather=None)¶
Calculate overall refraction under atmospheric and observing conditions.
- Parameters:
- wavelength
float wavelength is in nm (valid for 230.2 < wavelength < 2058.6)
- elevation
lsst.geom.Angle Elevation of the observation, as an Angle.
- observatory
lsst.afw.coord.Observatory Class containing the longitude, latitude, and altitude of the observatory.
- weather
lsst.afw.coord.Weather, optional Class containing the measured temperature, pressure, and humidity at the observatory during an observation If omitted, typical conditions for the observatory’s elevation will be calculated.
- wavelength
- Returns:
- refraction
lsst.geom.Angle The angular refraction for light of the given wavelength, under the given observing conditions.
- refraction
Notes
The calculation is taken from [1].
References
[1]R. C. Stone, “An Accurate Method for Computing Atmospheric Refraction,” Publications of the Astronomical Society of the Pacific, vol. 108, p. 1051, 1996.