33 lines
1.3 KiB
Python
33 lines
1.3 KiB
Python
"""JPL Planetary and Lunar Ephemeris DE423 for the jplephem package.
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This is the most recent short-period ephemeris published by the Jet
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Propulsion Laboratory. It achieves especially high accuracy for Mercury
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and Venus since it was prepared for the MESSENGER mission, and should be
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able to predict the coordinates of those planets within a few
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milliarcseconds.
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:Name: DE423 (February 2010)
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:Years: 1800 through 2200
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:Planets: Yes
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:Sun/Moon: Yes
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:Nutations: Yes
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:Librations: Yes
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:Report: `Folkner (2010) [PDF] <ftp://ssd.jpl.nasa.gov/pub/eph/planets/ioms/de423.iom.pdf>`_
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:Size: 36 MB
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While lunar missions will want to use the slightly older ephemeris
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`DE421 <http://pypi.python.org/pypi/de421>`_ because of the extra
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accuracy that it provides for the Moon, general purpose users will
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probably find this ephemeris more useful, especially as it covers a full
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400 years instead of only 150 years.
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Similar accuracy can be expected from the long-term ephemeris `DE422
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<http://pypi.python.org/pypi/de422>`_ which also covers a period of 6000
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years, making it useful to astronomy historians. But as it requires a
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half-gigabyte of disk space, some users may prefer DE423.
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To compute using this ephemeris in Python, see the `jplephem
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<http://pypi.python.org/pypi/jplephem>`_ package.
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"""
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