Description

This sub-package contains all the modules common to all missions.

WCS Info Dictionary

Many of the functions in this submodule require a wcsinfo dictionary. This dictionary contains information about the spacecraft pointing, and requires at least the following keys:

• 'ra_ref': The right ascension at the reference point in degrees.

• 'dec_ref': The declination at the reference point in degrees.

• 'v2_ref': The V2 reference point in arcseconds, with 'v3_ref' maps to 'ra_ref' and 'dec_ref'.

• 'v3_ref': The V3 reference point in arcseconds, with 'v2_ref' maps to 'ra_ref' and 'dec_ref'.

• 'roll_ref': Local roll angle associated with each aperture in degrees.

• 'v3yangle': The angle between V3 and North in degrees.

• 'vparity': The “V-parity” of the observation, which is 1 if the V3 axis is parallel to the detector Y-axis, and -1 if the V3 axis is parallel to the detector X-axis.