FK4¶
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class
astropy.coordinates.
FK4
(*args, **kwargs)[source] [edit on github]¶ Bases:
astropy.coordinates.BaseCoordinateFrame
A coordinate or frame in the FK4 system.
Note that this is a barycentric version of FK4 - that is, the origin for this frame is the Solar System Barycenter, not the Earth geocenter.
Parameters: representation :
BaseRepresentation
or NoneA representation object or None to have no data (or use the other keywords)
ra :
Angle
, optional, must be keywordThe RA for this object (
dec
must also be given andrepresentation
must be None).dec :
Angle
, optional, must be keywordThe Declination for this object (
ra
must also be given andrepresentation
must be None).distance :
Quantity
, optional, must be keywordThe Distance for this object along the line-of-sight. (
representation
must be None).equinox : astropy.time.Time, optional, must be keyword
The equinox of this frame.
obstime : astropy.time.Time, optional, must be keyword
The time this frame was observed. If None, will be the same as
equinox
.Attributes Summary
default_representation
equinox
frame_attributes
frame_specific_representation_info
name
obstime
Attributes Documentation
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default_representation
¶
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equinox
= <Time object: scale='tai' format='byear_str' value=B1950.000>¶
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frame_attributes
= OrderedDict([('equinox', <astropy.coordinates.baseframe.TimeFrameAttribute object at 0x7ff5256b0410>), ('obstime', <astropy.coordinates.baseframe.TimeFrameAttribute object at 0x7ff5256b0450>)])¶
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frame_specific_representation_info
¶
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name
= 'fk4'¶
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obstime
= None¶
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