FK5

class astropy.coordinates.FK5(*args, copy=True, representation_type=None, differential_type=None, **kwargs)[source]

Bases: astropy.coordinates.BaseRADecFrame

A coordinate or frame in the FK5 system.

Note that this is a barycentric version of FK5 - that is, the origin for this frame is the Solar System Barycenter, not the Earth geocenter.

The frame attributes are listed under Other Parameters.

Parameters
dataBaseRepresentation subclass instance

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

raAngle, optional, must be keyword

The RA for this object (dec must also be given and representation must be None).

decAngle, optional, must be keyword

The Declination for this object (ra must also be given and representation must be None).

distanceQuantity, optional, must be keyword

The Distance for this object along the line-of-sight. (representation must be None).

pm_ra_cosdecQuantity, optional, must be keyword

The proper motion in Right Ascension (including the cos(dec) factor) for this object (pm_dec must also be given).

pm_decQuantity, optional, must be keyword

The proper motion in Declination for this object (pm_ra_cosdec 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.

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.

copybool, optional

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

Other Parameters
equinoxTime

The equinox of this frame.

Attributes Summary

default_differential

default_representation

equinox

frame_attributes

frame_specific_representation_info

name

Attributes Documentation

default_differential
default_representation
equinox = <Time object: scale='tt' format='jyear_str' value=J2000.000>
frame_attributes = {'equinox': <astropy.coordinates.attributes.TimeAttribute object>}
frame_specific_representation_info
name = 'fk5'