FK4NoETerms¶
-
class
astropy.coordinates.
FK4NoETerms
(*args, copy=True, representation_type=None, differential_type=None, **kwargs)[source]¶ Bases:
astropy.coordinates.BaseRADecFrame
A coordinate or frame in the FK4 system, but with the E-terms of aberration removed.
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, keyword-only The RA for this object (
dec
must also be given andrepresentation
must be None).- dec
Angle
, optional, keyword-only The Declination for this object (
ra
must also be given andrepresentation
must be None).- distance
Quantity
[:ref: ‘length’], optional, keyword-only The Distance for this object along the line-of-sight. (
representation
must be None).- pm_ra_cosdec
Quantity
[:ref: ‘angular speed’], optional, keyword-only The proper motion in Right Ascension (including the
cos(dec)
factor) for this object (pm_dec
must also be given).- pm_dec
Quantity
[:ref: ‘angular speed’], optional, keyword-only The proper motion in Declination for this object (
pm_ra_cosdec
must also be given).- radial_velocity
Quantity
[:ref: ‘speed’], optional, keyword-only 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 unless overridden viaframe_specific_representation_info
. To see this frame’s names, check out<this frame>().representation_info
.- 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
unless overridden viaframe_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.
- data
- Other Parameters
Attributes Summary
Default representation for differential data (e.g., velocity)
Default representation for position data
Mapping for frame-specific component names
Attributes Documentation
-
default_differential
¶ Default representation for differential data (e.g., velocity)
-
default_representation
¶ Default representation for position data
-
equinox
= <Time object: scale='tt' format='byear_str' value=B1950.000>¶
-
frame_attributes
= {'equinox': <astropy.coordinates.attributes.TimeAttribute object>, 'obstime': <astropy.coordinates.attributes.TimeAttribute object>}¶
-
frame_specific_representation_info
¶ Mapping for frame-specific component names
-
name
= 'fk4noeterms'¶
-
obstime
= None¶