CooSys

class astropy.io.votable.tree.CooSys(ID=None, equinox=None, epoch=None, system=None, id=None, config=None, pos=None, **extra)

Bases: astropy.io.votable.tree.SimpleElement

COOSYS element: defines a coordinate system.

The keyword arguments correspond to setting members of the same name, documented below.

Attributes Summary

ID	[required] The XML ID of the COOSYS element, used for
epoch	Specifies the epoch of the positions.
equinox	A parameter required to fix the equatorial or ecliptic systems (as e.g.
system	Specifies the type of coordinate system.

Attributes Documentation

ID

[required] The XML ID of the COOSYS element, used for cross-referencing. May be None or a string conforming to XML ID syntax.

epoch

Specifies the epoch of the positions. It must be a string specifying an astronomical year.

equinox

A parameter required to fix the equatorial or ecliptic systems (as e.g. “J2000” as the default “eq_FK5” or “B1950” as the default “eq_FK4”).

system

Specifies the type of coordinate system. Valid choices are:

‘eq_FK4’, ‘eq_FK5’, ‘ICRS’, ‘ecl_FK4’, ‘ecl_FK5’, ‘galactic’, ‘supergalactic’, ‘xy’, ‘barycentric’, or ‘geo_app’