Data Columns in the XO Table

The NASA Exoplanet Archive provides access to high precision time series photometry from stars observed by various transit survey programs. The data have been donated by astronomers who have sought to search for extra-solar planets via photometric transits of the planets around the host stars. The photometric surveys are typically of specific regions of the sky (e.g., field stars, open clusters, etc). Each survey in the archive has different characteristics (e.g., field location, field size, filters in which time-series photometry was performed, magnitude ranges, etc.).

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Questions about the structure and use of this table in the archive format should use the Helpdesk link in the header.


Database Column Name Table Label Description
star_id Star ID published star name or ID number of star assigned by survey
tmass_id 2MASS ID Match The NASA Exoplanet Archive produced 2MASS coordinate match within a 20 arcsecond radius.
tmass_distance 2MASS Match Distance Angular distance between XO object and 2MASS match.
tmass_angle 2MASS Match Angle Position angle of vector from XO object and 2MASS match, measured East of North.
ra RA J2000 J2000 Right Ascension of star in decimal degree.
dec Dec J2000 J2000 Declination of star in decimal degree.
start_time Start HJD Date of first point in light curve.
end_time End HJD Date of last point in light curve.
jmag J mag Static value for apparent J 2MASS Magnitude of closest 2MASS source.
hmag H mag Static value for apparent H 2MASS Magnitude of closest 2MASS source.
kmag K mag Static value for apparent K 2MASS Magnitude of closest 2MASS source.
lcfilter Light Curve Filter name of filter in which light curve was obtained.
npts Points in light curve Number of data points in light curve. Must be at least one.

Last updated: 29 April 2013