webbpsf_ext.coords.get_sgd_offsets

webbpsf_ext.coords.get_sgd_offsets(sgd_type)

Get SGD offsets

Return ideal x and y position offsets for a SGD pattern. This includes the central position as the first in the series. Returns values in arcsec.

Parameters:

sgd_type (str) – Small grid dither pattern. Valid types are ‘9circle’, ‘5box’, ‘5diamond’, ‘3bar’, ‘5bar’, ‘5miri’, and ‘9miri’ where the first four refer to NIRCam coronagraphic dither positions and the last two are for MIRI coronagraphy. Can also use the APT names for the patterns: ‘9-POINT-CIRCLE’, ‘5-POINT-DIAMOND’, ‘5-POINT-BOX’, ‘3-POINT-BAR’, ‘5-POINT-BAR’, ‘5-POINT-SMALL-GRID’, ‘9-POINT-SMALL-GRID’.