Supergalactic

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

Bases: astropy.coordinates.BaseCoordinateFrame

Supergalactic Coordinates (see Lahav et al. 2000, <https://ui.adsabs.harvard.edu/abs/2000MNRAS.312..166L>, and references therein).

Parameters
dataBaseRepresentation subclass instance

A representation object or None to have no data (or use the coordinate component arguments, see below).

sglAngle, optional, keyword-only

The supergalactic longitude for this object (sgb must also be given and representation must be None).

sgbAngle, optional, keyword-only

The supergalactic latitude for this object (sgl must also be given and representation must be None).

distanceQuantity [‘speed’], optional, keyword-only

The Distance for this object along the line-of-sight.

pm_sgl_cossgbQuantity [‘angular speed’], optional, keyword-only

The proper motion in Right Ascension for this object (pm_sgb must also be given).

pm_sgbQuantity [‘angular speed’], optional, keyword-only

The proper motion in Declination for this object (pm_sgl_cossgb must also be given).

radial_velocityQuantity [‘speed’], optional, keyword-only

The radial velocity of this object.

representation_typeBaseRepresentation subclass, python:str, optional

A representation class or string name of a representation class. This sets the expected input representation class, thereby changing the expected keyword arguments for the data passed in. For example, passing representation_type='cartesian' will make the classes expect position data with cartesian names, i.e. x, y, z in most cases unless overriden via frame_specific_representation_info. To see this frame’s names, check out <this frame>().representation_info.

differential_typeBaseDifferential subclass, python:str, python:dict, optional

A differential class or dictionary of differential classes (currently only a velocity differential with key ‘s’ is supported). This sets the expected input differential class, thereby changing the expected keyword arguments of the data passed in. For example, passing differential_type='cartesian' will make the classes expect velocity data with the argument names v_x, v_y, v_z unless overriden via frame_specific_representation_info. To see this frame’s names, check out <this frame>().representation_info.

copybool, optional

If True (default), make copies of the input coordinate arrays. Can only be passed in as a keyword argument.

Attributes Summary

default_differential

default_representation

frame_attributes

frame_specific_representation_info

name

Attributes Documentation

default_differential
default_representation
frame_attributes = {}
frame_specific_representation_info
name = 'supergalactic'