healpy.query_disc(nside, vec, radius, inclusive=False, fact=4, nest=False, buff=None)

Returns pixels whose centers lie within the disk defined by vec and radius (in radians) (if inclusive is False), or which overlap with this disk (if inclusive is True).


The nside of the Healpix map.

vecfloat, sequence of 3 elements

The coordinates of unit vector defining the disk center.


The radius (in radians) of the disk

inclusivebool, optional

If False, return the exact set of pixels whose pixel centers lie within the disk; if True, return all pixels that overlap with the disk, and maybe a few more. Default: False

factint, optional

Only used when inclusive=True. The overlapping test will be done at the resolution fact*nside. For NESTED ordering, fact must be a power of 2, less than 2**30, else it can be any positive integer. Default: 4.

nest: bool, optional

if True, assume NESTED pixel ordering, otherwise, RING pixel ordering

buff: int array, optional

if provided, this numpy array is used to contain the return values and must be at least long enough to do so

ipixint, array

The pixels which lie within the given disk.