autowisp.astrometry.healpix_utilities module

Class Inheritance Diagram

Inheritance diagram of WCS

Simple functions useful when interacing with HEALpix library.

autowisp.astrometry.healpix_utilities.square_query_vertices(center, size, rotation=0.0)[source]

Vertices defining a rectangular query to pass to healpy.query_polygon.

Parameters:

  • center – The RA, Dec coordinates of the center of the query in degrees.

  • size – The full width/height of the rectangular region to query in degrees. If a single value, a square region is costructed.

  • rotation – The angle in degrees between the up direction in the query region and north. Going positive from zero corresponds to the up direction picking up a positve component along RA.

Returns:

The 4 unit vectors of the corners of the query on the unit sphere.

Return type:

array with shape (4, 3)