proper_motion_uncertainty

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

Calculate the sky averaged proper motion uncertainties from G, for a given Gaia data release.

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:

mualpha_cosdelta_uncertainty, mudelta_uncertainty – The uncertainty in mu_alpha* and the uncertainty in mu_delta, in that order, in micro-arcseconds/year.

Return type:

float or array

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.