pygaia/errors/astrometric.py
def positionError(G, vmini, beta, extension=0.0):
  """
  Calculate the position errors from G and (V-I) and the Ecliptic latitude beta of the source.

  NOTE! THE ERRORS ARE FOR SKY POSITIONS IN THE ICRS (I.E., RIGHT ASCENSION, DECLINATION). MAKE SURE YOUR
  SIMULATED ASTROMETRY IS ALSO ON THE ICRS.

  Parameters
  ----------

  G     - Value(s) of G-band magnitude.
  vmini - Value(s) of (V-I) colour.
  beta  - Value(s) of the Ecliptic latitude.

  Keywords
  --------

  extension - Add this amount of years to the mission lifetime and scale the errors accordingly.

  Returns
  -------

  The error in alpha* and the error in delta, in that order, in micro-arcsecond.
  """
  parallaxError = parallaxErrorSkyAvg(G, vmini, extension=extension)
  return errorScalingFactor('alphaStar',beta)*parallaxError, \
         errorScalingFactor('delta',beta)*parallaxError
def positionError(G, vmini, beta, extension=0.0):
  """
  Calculate the position errors from G and (V-I) and the Ecliptic latitude beta of the source.

  NOTE! THE ERRORS ARE FOR SKY POSITIONS IN THE ICRS (I.E., RIGHT ASCENSION, DECLINATION). MAKE SURE YOUR
  SIMULATED ASTROMETRY IS ALSO ON THE ICRS.

  Parameters
  ----------

  G     - Value(s) of G-band magnitude.
  vmini - Value(s) of (V-I) colour.
  beta  - Value(s) of the Ecliptic latitude.

  Keywords
  --------

  extension - Add this amount of years to the mission lifetime and scale the errors accordingly.

  Returns
  -------

  The error in alpha* and the error in delta, in that order, in micro-arcsecond.
  """
  parallaxError = parallaxErrorSkyAvg(G, vmini, extension=extension)
  return errorScalingFactor('alphaStar',beta)*parallaxError, \
         errorScalingFactor('delta',beta)*parallaxError
Calculate the position errors from G and (V-I) and the Ecliptic latitude beta of the source.

  NOTE! THE ERRORS ARE FOR SKY POSITIONS IN THE ICRS (I.E., RIGHT ASCENSION, DECLINATION). MAKE SURE YOUR
  SIMULATED ASTROMETRY IS ALSO ON THE ICRS.

  Parameters
  ----------

  G     - Value(s) of G-band magnitude.
  vmini - Value(s) of (V-I) colour.
  beta  - Value(s) of the Ecliptic latitude.

  Keywords
  --------

  extension - Add this amount of years to the mission lifetime and scale the errors accordingly.

  Returns
  -------

  The error in alpha* and the error in delta, in that order, in micro-arcsecond.