# Supergalactic¶

class astropy.coordinates.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: 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

Attributes Documentation

default_differential
default_representation
frame_specific_representation_info
name = 'supergalactic'