HeliocentricEclipticIAU76

class astropy.coordinates.HeliocentricEclipticIAU76(*args, copy=True, representation_type=None, differential_type=None, **kwargs)[source]

Bases: astropy.coordinates.BaseEclipticFrame

Heliocentric mean (IAU 1976) ecliptic coordinates. These origin of the coordinates are the center of the sun, with the x axis pointing in the direction of the mean (not true) equinox of J2000, and the xy-plane in the plane of the ecliptic of J2000 (according to the IAU 1976/1980 obliquity model). It has, therefore, a fixed equinox and an older obliquity value than the rest of the frames.

The frame attributes are listed under Other Parameters.

{params}

Parameters
dataBaseRepresentation subclass instance

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

lonAngle, optional, must be keyword

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

latAngle, optional, must be keyword

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

distanceQuantity, optional, must be keyword

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

pm_lon_coslatAngle, 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_latAngle, optional, must be keyword

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

radial_velocityQuantity, optional, must be keyword

The radial velocity of this object.

representation_typeBaseRepresentation 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_typeBaseDifferential 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.

copybool, optional

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

Attributes Summary

default_differential

default_representation

frame_attributes

frame_specific_representation_info

name

obstime

Attributes Documentation

default_differential
default_representation
frame_attributes = {'obstime': <astropy.coordinates.attributes.TimeAttribute object>}
frame_specific_representation_info
name = 'heliocentriceclipticiau76'
obstime = <Time object: scale='tt' format='jyear_str' value=J2000.000>