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 andrepresentation
must be None).- lat :
Angle
, optional, must be keyword The ecliptic latitude for this object (
lon
must also be given andrepresentation
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 namesv_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>, 'obstime': <astropy.coordinates.attributes.TimeAttribute object>}¶
-
frame_specific_representation_info
¶
-
name
= 'heliocentrictrueecliptic'¶
-
obstime
= <Time object: scale='utc' format='jyear_str' value=J2000.000>¶
- data :