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Below follow the instructions bullet list for making an output file from HORIZONS compatible with ALMA software.
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Go to http://ssd.jpl.nasa.gov/horizons.cgi
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Ephemeris Type should be "Observer"
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This should be the default. If not, click the "change" link immediately to the right of "Ephemeris Type", and select "Observer Table"
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Click "Use Selection Above" button
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Set your "Target Body"
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Click the "change" link immediately to the right to put in what you want
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"Observer Location" should be "Geocentric" (probably the default)
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"Time Span" should be set as needed (clicking "change" link immediately to the right to get fields for a time range)
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"Table Settings":
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Click "change" link immediately to the right of "Table Settings"
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This will bring up a lot of check boxes
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There are 2 checkboxes that must be checked:
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"Astrometric RA & DEC"
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"Obsrv range & rng rate"
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All other settings are optional
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Important: for "Display/Output"
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Click "change" link next to "Display/Output"
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Select "plain text"
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Click "Use Selection Above"
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Once done, double check your Current Settings, to make sure they match all the settings above.
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If OK, click the "Generate Ephemeris" button
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The page can then be saved as a file through the browser
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Remember to include the ".txt" extension on the filename
Next:
Observatory Setups
Up:
Create an External Ephemeris
Previous:
NASA resources for HORIZONS
Contents
Index
The ALMA OT Team, 2011 May 20