Bases: astropy.coordinates.BaseCoordinateFrame
A coordinate frame defined in a similar manner as GCRS, but precessed to a requested (mean) equinox. Note that this does not end up the same as regular GCRS even for J2000 equinox, because the GCRS orientation is fixed to that of ICRS, which is not quite the same as the dynamical J2000 orientation.
This frame has these frame attributes:
The (mean) equinox to precess the coordinates to.
The time at which the observation is taken. Used for determining the position of the Earth.
3-vector giving the position of the observer relative to the center-of-mass of the Earth, oriented the same as BCRS/ICRS. Defaults to 0, meaning “true” GCRS.
3-vector giving the velocity of the observer relative to the center-of-mass of the Earth, oriented the same as BCRS/ICRS. Defaults to 0, meaning “true” GCRS.
Parameters: | representation : BaseRepresentation or None
ra : Angle, optional, must be keyword
dec : Angle, optional, must be keyword
distance : Quantity, optional, must be keyword
|
---|
Attributes Summary
default_representation | |
equinox | |
frame_attributes | |
frame_specific_representation_info | |
name | |
obsgeoloc | |
obsgeovel | |
obstime |
Attributes Documentation