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.

copy : bool, optional

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

Attributes Summary

`default_representation`
`equinox`
`frame_attributes`
`frame_specific_representation_info`
`name`
`obstime`

Attributes Documentation

equinox = <Time object: scale='tai' format='byear_str' value=B1950.000>¶

frame_attributes = OrderedDict([('equinox', <astropy.coordinates.baseframe.TimeFrameAttribute object>), ('obstime', <astropy.coordinates.baseframe.TimeFrameAttribute object>)])¶