Bases: KPFTranslatorFunction
Return the DAR correction in arcseconds between the CRED2 wavelength
and the science wavelength.
Calculation from Filippenko 1982 (PASP, 94:715-721, August 1982)
ARGS:
:EL: float Elevation of the telescope.
Source code in kpf/utils/CalculateDAR.py
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88 | class CalculateDAR(KPFTranslatorFunction):
'''Return the DAR correction in arcseconds between the CRED2 wavelength
and the science wavelength.
Calculation from Filippenko 1982 (PASP, 94:715-721, August 1982)
ARGS:
=====
:EL: `float` Elevation of the telescope.
'''
@classmethod
def pre_condition(cls, args, logger, cfg):
pass
@classmethod
def perform(cls, args, logger, cfg):
dcs = ktl.cache('dcs1')
EL = dcs['EL'].read(binary=True)*180/np.pi
DARarcsec = calculate_DAR_arcsec(EL)
log.info(f"Calculated DAR for {EL:.1f} EL = {DARarcsec:.3f} arcsec")
dx, dy = calculate_DAR_pix(DARarcsec)
log.info(f"Pixel shift is {dx:.1f}, {dy:.1f} = {(dx**2+dy**2)**0.5:.1f}")
@classmethod
def post_condition(cls, args, logger, cfg):
pass
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