refraction¶
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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.
Returns: - refraction :
lsst.geom.Angle The angular refraction for light of the given wavelength, under the given observing conditions.
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. - wavelength :