total_proper_motion_uncertainty

pygaia.errors.astrometric.total_proper_motion_uncertainty(gmag, release='dr4')

Calculate the sky averaged total proper motion uncertainty as a function of G and for the given Gaia data release. This refers to the semi-major axis of the proper motion error ellipse.

Parameters:

• gmag (float or array) – Value(s) of G-band magnitude.

• release (str) – Specify the Gaia data release for which the performance is to be simulated. ‘dr3’ -> Gaia (E)DR3, ‘dr4’ -> Gaia DR4, ‘dr5’ -> Gaia DR5. Default is ‘dr4’.

Returns:

The semi-major axis of the proper motion error ellipse in micro-arcseconds/year.

Return type:

proper_motion_uncertainty

Raises:

ValueError – When an invalid string is specified for the release parameter.

Notes

The uncertainties are for proper motions in the ICRS (i.e., right ascension, declination). Make sure your simulated astrometry is also on the ICRS.