refcat2#

stellarphot.core.refcat2(field_center, radius=<Quantity 1. deg>, clip_by_frame=False, padding=100, magnitude_limit=None, magnitude_limit_passband=None)[source]#

Return the items from Refcat2 that are within the search radius and (optionally) within the field of view of a frame.

Parameters:

field_centerastropy.coordinates.SkyCoord, astropy.wcs.WCS, or FITS header: Either a SkyCoord object, a WCS object or a FITS header with WCS information. The input coordinate should be the center of the frame; if a header or WCS is the input then the center of the frame will be determined from the WCS.
radiusastropy.units.Quantity, optional: Radius around which to search.
clip_by_framebool, optional: If True, only return items that are within the field of view of the frame.
paddingint, optional: Coordinates need to be at least this many pixels in from the edge of the frame to be considered in the field of view. Default value is 100.
magnitude_limitfloat, optional: If provided, only return items with magnitudes less than or equal to this value.
magnitude_limit_passbandstr, optional, default is “SR”: If provided, the passband to use for the magnitude limit. The name of the passband must be one of the AAVSO standard passband names.

Returns:

stellarphot.CatalogData: Table of catalog information.

Notes

Refcat2 includes Gaia DR2 RA/Dec and magnitudes but does not include the Gaia DR2 ID number. This function looks up the Gaia DR2 ID number and uses it as the ID column.

The reference for the refcat2 paper is:

Tonry, J. L., Denneau, L., Flewelling, H., et al. 2018, ApJ, 867, https://iopscience.iop.org/article/10.3847/1538-4357/aae386