HeliocentricTrueEcliptic

class astropy.coordinates.HeliocentricTrueEcliptic(*args, copy=True, representation_type=None, differential_type=None, **kwargs)[source] [edit on github]

Bases: astropy.coordinates.BaseEclipticFrame

Heliocentric ecliptic coordinates. These origin of the coordinates are the center of the sun, with the x axis pointing in the direction of the true (not mean) equinox as at the time specified by the equinox attribute (as seen from Earth), and the xy-plane in the plane of the ecliptic for that date.

The frame attributes are listed under Other Parameters.

{params}

Parameters:
data : BaseRepresentation subclass instance

A representation object or None to have no data (or use the coordinate component arguments, see below).

lon : Angle, optional, must be keyword

The ecliptic longitude for this object (lat must also be given and representation must be None).

lat : Angle, optional, must be keyword

The ecliptic latitude for this object (lon must also be given and representation must be None).

distance : Quantity, optional, must be keyword

The distance for this object from the sun’s center. (representation must be None).

pm_lon_coslat : Angle, optional, must be keyword

The proper motion in the ecliptic longitude (including the cos(lat) factor) for this object (pm_lat must also be given).

pm_lat : Angle, optional, must be keyword

The proper motion in the ecliptic latitude for this object (pm_lon_coslat must also be given).

radial_velocity : Quantity, optional, must be keyword

The radial velocity of this object.

representation_type : BaseRepresentation subclass, str, optional

A representation class or string name of a representation class. This sets the expected input representation class, thereby changing the expected keyword arguments for the data passed in. For example, passing representation_type='cartesian' will make the classes expect position data with cartesian names, i.e. x, y, z in most cases.

differential_type : BaseDifferential subclass, str, dict, optional

A differential class or dictionary of differential classes (currently only a velocity differential with key ‘s’ is supported). This sets the expected input differential class, thereby changing the expected keyword arguments of the data passed in. For example, passing differential_type='cartesian' will make the classes expect velocity data with the argument names v_x, v_y, v_z.

copy : bool, optional

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

Other Parameters:
 
equinox : Time, optional

The date to assume for this frame. Determines the location of the x-axis and the location of the Earth and Sun. Defaults to the ‘J2000’ equinox.

Attributes Summary

default_differential
default_representation
equinox
frame_attributes
frame_specific_representation_info
name
obstime

Attributes Documentation

default_differential
default_representation
equinox = <Time object: scale='utc' format='jyear_str' value=J2000.000>
frame_attributes = {'equinox': <astropy.coordinates.attributes.TimeAttribute object at 0x7f7ffef51748>, 'obstime': <astropy.coordinates.attributes.TimeAttribute object at 0x7f7ffef517f0>}
frame_specific_representation_info
name = 'heliocentrictrueecliptic'
obstime = <Time object: scale='utc' format='jyear_str' value=J2000.000>