Orbit Fit Seeds#
Methods for an initial orbit fit from astrometry, incl. Gauss’s method.
- jorbit.astrometry.orbit_fit_seeds.gauss_method_orbit(obs)[source]#
Gauss’s method for orbit determination from three observations.
- Parameters:
obs (
Observations) – A set of three observations.- Returns:
The state of the best-fitting orbit.
- Return type:
- jorbit.astrometry.orbit_fit_seeds.simple_circular(ra, dec, semi, time)[source]#
Compute a circular orbit of a given size that passes through a given coordinate.
A simpler alternative to Gauss’s method, assumes that the particle is observed at its highest excursion from the ecliptic.
- Parameters:
ra (
float) – Right ascension of the object in radians, ICRS.dec (
float) – Declination of the object in radians, ICRS.semi (
float) – Semi-major axis of the orbit in AU.time (
float) – Time of the observation in JD, tdb.
- Returns:
The state of the implied orbit.
- Return type: