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Date and Time: Enter the JD's of the observation with as much precision as possible in order to correct for Earth's orbital motion and rotation. The reference time base should be UTC. This may be a single time or a comma-separated list of times for the object at the same site.

Right Ascension: Enter the target star right ascension on the date of observation for Epoch 2000. The entry may be in sexigesimal hh.mm.ss.sss or decimal degrees ddd.dd. Do not enter decimal hours.

Declination: Enter the declination of the target star on the date of observation for Epoch 2000. Use decimal degrees dd.dd or sexigesimal dd.mm.ss.sss.

Proper motion (PM) in RA and Dec given in milliarcseconds (mas) per year.

Parallax in mas.

Longitude in degrees. Use + for east of the meridian. Mt. Kent in Australia is +151.855640. Minerva North and TRES on Mt. Hopkins are at -110.9520. Moore Observatory is -85.528475.

Latitude in degrees. Mt. Kent in Australia is -27.798217. Minerva North and TRES on Mt. Hopkins are at +31.6751. Moore Observatory is +38.344792 .

Elevation of the observation site in meters. Use 682 m for Mt. Kent, 2607 m for Mt. Hopkins, and 229 m for Moore.

Approximate radial velocity: Catalog velocity of target star (km/s).

Redshift z: For highest accuracy, include z = (λ_observed/λ_emitted - 1). Use 0.0 otherwise.

Submit: Sends the request to our server where we confirm the request validity, and returns the velocity correction (m/s) to be added to your velocity in order to have a barycentric radial velocity. There may be a delay if the datafiles have to be refreshed.

Credits:
Python and Astropy Barycorrpy
Wright and Eastman 2014