cartesian_lsr¶
- sofia_redux.spectroscopy.earthvelocity.cartesian_lsr(definition='kinematic')[source]¶
Find the radial LSR velocity towards sky coordinates.
The Local Standard of Rest allows for two different definitions:
‘kinematic’ uses 20 km/s towards 18:00:00, +30:00:00 (‘J1900’)
‘dynamical’ uses the IAU definition of 9, 12, and 7 km/s along the x, y, and z axis in Galactic cartesian coordinates.
- Parameters:
- definitionstr, optional
One of {‘kinematic’, ‘dynamical’}
- Returns:
- lsr_velCartesianRepresentation
Cartesian representation of the LSR velocity in km / s