Supergalactic

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

Bases: 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 [:ref: ‘speed’], optional, keyword-only

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

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

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

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

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

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

The radial velocity of this object.

representation_typeBaseRepresentation subclass, 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 overridden via frame_specific_representation_info. To see this frame’s names, check out <this frame>().representation_info.

differential_typeBaseDifferential subclass, str, 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 overridden 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 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 = 'supergalactic'