CIRS¶

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

A coordinate or frame in the Celestial Intermediate Reference System (CIRS).

The frame attributes are listed under Other Parameters.

Parameters:

representation : BaseRepresentation or None

A representation object or None to have no data (or use the other keywords below).

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).

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.

copy : bool, optional

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

Other Parameters:

obstime : Time

The time at which the observation is taken. Used for determining the position of the Earth and its precession.

Attributes Summary

`default_differential`
`default_representation`
`frame_attributes`
`frame_specific_representation_info`
`name`
`obstime`

Attributes Documentation

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

obstime = <Time object: scale='utc' format='jyear_str' value=J2000.000>¶