LSRD#

class astropy.coordinates.LSRD(*args, copy=True, representation_type=None, differential_type=None, **kwargs)[source]#

Bases: BaseRADecFrame

A frame in the Dynamical Local Standard of Rest (LSR).

Conceptually the dynamical LSR is a frame moving at the circular velocity at the Sun’s location. In practice, the concept of a circular velocity in a non-axisymmetric galaxy is not trivial. This LSRD frame uses the historical definition from

Delhaye 1965, Solar Motion and Velocity Distribution of Common Stars - Section 2.1.

meaning the solar motion is \((U, V, W) = (9, 12, 7)~{{\rm km}}~{{\rm s}}^{{-1}}\), or 16.5 km/s towards l=53 b=25. The frame is axis-aligned and co-spatial with ICRS.

Attributes Summary

`default_differential`	Default representation for differential data (e.g., velocity)
`default_representation`	Default representation for position data
`frame_attributes`
`frame_specific_representation_info`	Mapping for frame-specific component names
`name`

Attributes Documentation

default_differential#: Default representation for differential data (e.g., velocity)

default_representation#: Default representation for position data

frame_attributes = {}#

frame_specific_representation_info#: Mapping for frame-specific component names

name = 'lsrd'#