# Supergalactic¶

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

Supergalactic Coordinates (see Lahav et al. 2000, <http://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, must be keyword

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

sgbAngle, optional, must be keyword

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

distanceQuantity, optional, must be keyword

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

pm_sgl_cossgbQuantity, optional, must be keyword

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

pm_sgbQuantity, optional, must be keyword

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

radial_velocityQuantity, optional, must be keyword

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 overriden 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 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

Attributes Documentation

default_differential
default_representation
frame_specific_representation_info
name = 'supergalactic'