sinusoidal

m4opt.skygrid.sinusoidal(area)

Generate a uniform grid on a sinusoidal projection.

This is similar to what was used for GRANDMA follow-up in LIGO/Virgo Observing Run 3 (O3), but is more efficient at tiling the poles [1].

Parameters:

area (Annotated[Quantity, PhysicalType('solid angle')]) – The average area per tile in any Astropy solid angle units: for example, 10 * astropy.units.deg**2 or 0.1 * astropy.units.steradian.

Returns:

The coordinates of the tiles.

References

[1]

Igor Andreoni, Daniel A. Goldstein, Shreya Anand, et al. GROWTH on S190510g: DECam Observation Planning and Follow-up of a Distant Binary Neutron Star Merger Candidate. ApJL, 881(1):L16, August 2019. arXiv:1906.00806, doi:10.3847/2041-8213/ab3399.