get_apertures

mmtwfs.wfs.get_apertures(data, apsize, fwhm=5.0, thresh=7.0, plot=True, cen=None, box=50)

Use wfsfind to locate and centroid spots. Measure their S/N ratios and the sigma of a 2D gaussian fit to the co-added spot.

Parameters:

datastr or 2D ndarray

WFS image to analyze, either FITS file or ndarray image data

apsizefloat

Diameter/width of the SH apertures

cenlist-like or None

Pupil center (x, y). If given, background statistics come from a box around it rather than the whole image.

boxint

Half-width in pixels of the background statistics box around cen. It should fit inside the central obscuration, or light from the inner ring of spots inflates the noise estimate.

Returns:

srcsastropy.table.Table

Detected WFS spot positions and properties

maskslist of photutils.ApertureMask objects

Masks used for aperture centroiding

snrs1D np.ndarray

S/N for each located spot

sigmafloat