py4py.physics

Physics functions

Things like calculating Keplerian velocity, doppler shifts and the like.

keplerian_velocity(→ float)	Calculates Keplerian velocity at given radius
doppler_shift_wave(→ float)	Converts passed line and velocity into red/blue-shifted wavelength
doppler_shift_vel(→ float)	Converts passed red/blue-shifted wave into velocity

Module Contents

py4py.physics.keplerian_velocity(mass: float, radius: float) → float

Calculates Keplerian velocity at given radius

Parameters:

• mass (float) – Object mass in kg

• radius (float) – Orbital radius in m

Returns:

Orbital velocity in m/s

Return type:

float

py4py.physics.doppler_shift_wave(line: float, vel: float) → float

Converts passed line and velocity into red/blue-shifted wavelength

Parameters:

• line (float) – Line wavelength (any length unit)

• vel (float) – Doppler shift velocity (m/s)

Returns:

Doppler shifted line wavelength (as above)

Return type:

float

py4py.physics.doppler_shift_vel(line: float, wave: float) → float

Converts passed red/blue-shifted wave into velocity

Parameters:

• line (float) – Base line wavelength (any length unit)

• wave (float) – Doppler shifted line wavelength (as above)

Returns:

Speed of Doppler shift

Return type:

float