ICRS¶
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class
astropy.coordinates.
ICRS
(*args, **kwargs)[source] [edit on github]¶ Bases:
astropy.coordinates.BaseCoordinateFrame
A coordinate or frame in the ICRS system.
If you’re looking for “J2000” coordinates, and aren’t sure if you want to use this or
FK5
, you probably want to use ICRS. It’s more well-defined as a catalog coordinate and is an inertial system, and is very close (within tens of milliarcseconds) to J2000 equatorial.For more background on the ICRS and related coordinate transformations, see the references provided in the See Also section of the documentation.
Parameters: representation :
BaseRepresentation
or NoneA representation object or None to have no data (or use the other keywords)
ra :
Angle
, optional, must be keywordThe RA for this object (
dec
must also be given andrepresentation
must be None).dec :
Angle
, optional, must be keywordThe Declination for this object (
ra
must also be given andrepresentation
must be None).distance :
Quantity
, optional, must be keywordThe Distance for this object along the line-of-sight. (
representation
must be None).Attributes Summary
default_representation
frame_specific_representation_info
name
Attributes Documentation
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default_representation
¶
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frame_specific_representation_info
¶
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name
= 'icrs'¶
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