FK5¶
-
class
astropy.coordinates.
FK5
(*args, copy=True, representation_type=None, differential_type=None, **kwargs)[source] [edit on github]¶ 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: - data :
BaseRepresentation
subclass instance A representation object or
None
to have no data (or use the coordinate component arguments, see below).- ra :
Angle
, optional, must be keyword The RA for this object (
dec
must also be given andrepresentation
must be None).- dec :
Angle
, optional, must be keyword The Declination for this object (
ra
must also be given andrepresentation
must be None).- distance :
Quantity
, optional, must be keyword The Distance for this object along the line-of-sight. (
representation
must be None).- pm_ra_cosdec :
Quantity
, 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_dec :
Quantity
, optional, must be keyword The proper motion in Declination for this object (
pm_ra_cosdec
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 namesv_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.
Other Parameters: - equinox :
Time
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='utc' format='jyear_str' value=J2000.000>¶
-
frame_attributes
= {'equinox': <astropy.coordinates.attributes.TimeAttribute object>}¶
-
frame_specific_representation_info
¶
-
name
= 'fk5'¶
- data :