Keplerian Orbits¶
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radvel.kepler.
kepler
(inbigM, inecc)[source]¶ Solve Kepler’s Equation
Parameters: - inbigM (array) – input Mean anomaly
- inecc (array) – eccentricity
Returns: array
Return type: eccentric anomaly
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radvel.kepler.
rv_drive
(t, orbel, use_c_kepler_solver=True)[source]¶ RV Drive
Parameters: - t (array of floats) – times of observations
- orbel (array of floats) – [per, tp, e, om, K]. Omega is expected to be in radians
- use_c_kepler_solver (bool) – (default: True) If True use the Kepler solver written in C, else use the Python/NumPy version.
Returns: (array of floats): radial velocity model
Return type: rv
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radvel.orbit.
timeperi_to_timetrans
(tp, per, ecc, omega, secondary=False)[source]¶ Convert Time of Periastron to Time of Transit
Parameters: - tp (float) – time of periastron
- per (float) – period [days]
- ecc (float) – eccentricity
- omega (float) – argument of peri (radians)
- secondary (bool) – calculate time of secondary eclipse instead
Returns: time of inferior conjuntion (time of transit if system is transiting)
Return type: float
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radvel.orbit.
timetrans_to_timeperi
(tc, per, ecc, omega)[source]¶ Convert Time of Transit to Time of Periastron Passage
Parameters: - tc (float) – time of transit
- per (float) – period [days]
- ecc (float) – eccecntricity
- omega (float) – longitude of periastron (radians)
Returns: time of periastron passage
Return type: float
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radvel.orbit.
true_anomaly
(t, tp, per, e)[source]¶ Calculate the true anomoly for a given time, period, eccentricity.
Parameters: - t (array) – array of times in JD
- tp (float) – time of periastron, same units as t
- per (float) – orbital period in days
- e (float) – eccentricity
Returns: true anomoly at each time
Return type: array