altaz_track

nyx.emitter.catalogs.astrometry.altaz_track(coord, times, frames)

Where coord is, in each observation’s AltAz frame.

Proper motion is applied per epoch.

Parameters:

• coord (astropy.coordinates.SkyCoord) – Scalar or array of catalog positions.

• times (astropy.time.Time) – One epoch per observation.

• frames (sequence of astropy.coordinates.AltAz) – One frame per observation, matching times.

Returns:

(az, alt) in radians.

Return type:

numpy.ndarray, shape (nobs, n_src, 2)