FK4¶

class astropy.coordinates.FK4(*args, **kwargs)[source] [edit on github]

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 None A representation object or None to have no data (or use the other keywords) ra : Angle, optional, must be keyword The RA for this object (dec must also be given and representation must be None). dec : Angle, optional, must be keyword The Declination for this object (ra 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. (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

Attributes Documentation

default_representation
equinox = <Time object: scale='tai' format='byear_str' value=B1950.000>
frame_attributes = OrderedDict([('equinox', <astropy.coordinates.baseframe.TimeFrameAttribute object at 0x7faa1b69c150>), ('obstime', <astropy.coordinates.baseframe.TimeFrameAttribute object at 0x7faa1b69c190>)])
frame_specific_representation_info
name = 'fk4'
obstime = None