sky_annulus

gdt.core.plot.lib.sky_annulus(center_x, center_y, radius, width, ax, color='black', alpha=0.3, frame='equatorial', flipped=True, **kwargs)[source]

Plot an annulus on the sky defined by its center, radius, and width.

Parameters:

  • center_x (float) – The azimuthal center, in degrees

  • center_y (float) – The polar center, in degrees

  • radius (float) – The radius in degrees, defined as the angular distance from the center to the middle of the width of the annulus band

  • width (float) – The width of the annulus in degrees

  • ax (matplotlib.axes) – Plot axes object

  • color (string, optional) – The color of the annulus. Default is black.

  • alpha (float, optional) – The opacity of the annulus. Default is 0.3

  • frame (str, optional) – Either ‘equatorial’, ‘galactic’, or ‘spacecraft’. Default is ‘equatorial’

  • flipped (bool, optional) – If True, the azimuthal axis is flipped, following the equatorial convention

  • **kwargs – Other plotting options

Returns:

(list of matplotlib.patches.Polygon)