Supergalactic

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

Bases: astropy.coordinates.BaseCoordinateFrame

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

Parameters:

data : BaseRepresentation subclass instance

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

sgl : Angle, optional, must be keyword

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

sgb : Angle, optional, must be keyword

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

distance : Quantity, optional, must be keyword

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

pm_sgl_cossgb : Quantity, optional, must be keyword

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

pm_sgb : Quantity, optional, must be keyword

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

radial_velocity : Quantity, optional, must be keyword

The radial velocity of this object.

representation_type : BaseRepresentation 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.

differential_type : BaseDifferential 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.

copy : bool, 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_specific_representation_info
name

Attributes Documentation

default_differential

default_representation

frame_specific_representation_info

name = 'supergalactic'