from astrodata import astro_data_tag, astro_data_descriptor, returns_list, TagSet
from ..gemini import AstroDataGemini
from .. import gmu
[docs]class AstroDataBhros(AstroDataGemini):
__keyword_dict = dict(array_section = 'CCDSEC',
central_wavelength = 'WAVELENG',
overscan_section = 'BIASSEC')
@staticmethod
def _matches_data(source):
return source[0].header.get('INSTRUME', '').upper() == 'BHROS'
@astro_data_tag
def _tag_instrument(self):
return TagSet(set(['BHROS', 'SPECT']), ())
[docs] @astro_data_descriptor
def central_wavelength(self, asMicrometers=False, asNanometers=False,
asAngstroms=False):
"""
Returns the central wavelength in meters or the specified units
Parameters
----------
asMicrometers : bool
If True, return the wavelength in microns
asNanometers : bool
If True, return the wavelength in nanometers
asAngstroms : bool
If True, return the wavelength in Angstroms
Returns
-------
float
The central wavelength setting
"""
unit_arg_list = [asMicrometers, asNanometers, asAngstroms]
if unit_arg_list.count(True) == 1:
# Just one of the unit arguments was set to True. Return the
# central wavelength in these units
if asMicrometers:
output_units = "micrometers"
if asNanometers:
output_units = "nanometers"
if asAngstroms:
output_units = "angstroms"
else:
# Either none of the unit arguments were set to True or more than
# one of the unit arguments was set to True. In either case,
# return the central wavelength in the default units of meters.
output_units = "meters"
# The central_wavelength keyword is in Angstroms
keyword = self._keyword_for('central_wavelength')
wave_in_angstroms = self.phu.get(keyword, -1)
if wave_in_angstroms < 0:
return None
return gmu.convert_units('angstroms', wave_in_angstroms,
output_units)
[docs] @astro_data_descriptor
def dec(self):
"""
Returns the Declination of the center of field in degrees. Since a
fiber is used it coincides with the position of the target. For code
re-used, use target_dec() if you really want the position of the target
rather than the center of the field.
Returns
-------
float
right ascension in degrees
"""
# using the target_dec descriptor since the WCS is not sky coords
return self.target_dec(offset=True, icrs=True)
[docs] @astro_data_descriptor
def disperser(self, stripID=False, pretty=False):
"""
Returns the name of the disperser. This is always 'bHROS'
Parameters
----------
stripID : bool
Does nothing
pretty : bool
Does nothing
Returns
-------
str
The name of the disperser
"""
return 'bHROS'
[docs] @astro_data_descriptor
def ra(self):
"""
Returns the Right Ascension of the center of field in degrees.
Since a fiber is used it coincides with the position of the target.
For code re-used, use target_ra() if you really want the position of
the target rather than the center of the field.
Returns
-------
float
right ascension in degrees
"""
# using the target_ra descriptor since the WCS is not sky coords
return self.target_ra(offset=True, icrs=True)