Data Columns in the KELT Table

The NASA Exoplanet Archive provides access to KELT time series through a search interface and the application programming interface (API). The following table lists all the data columns in the KELT Time Series table (kelttimeseries) that can be returned through the API.

See the KELT page for more information on the KELT data products available at the NASA Exoplanet Archive.

If you have questions about the structure or use of this table in the archive format, submit a Helpdesk ticket.

Target Labels and Flags

Database Column Name Table Label Description
kelt_sourceid† Source ID KELT Object Identification
kelt_field† Survey Field KELT field of observation. Fields available are N02, N04, N06, N08, N10 and N12
kelt_orientation† Field Orientation KELT field orientation; either "east" or "west."
proc_type† Processing KELT timeseries processing; either "raw" or "tfa."
ra† RA [decimal degrees] Right Ascension of the target in decimal degrees
dec† Dec [decimal degrees] Declination of the target in decimal degrees
bjdstart† Start BJD [days] Date of first point in light curve Barycentric Julian Date. For N02, timestamps are in approximate BJD where the correction for the field center to edge difference has not been applied. This correction has a maximum value of 30 seconds, but is typically of order 1-5 seconds. For N04, the timestamps are JD_TT, not BJD.
bjdstop† End BJD [days] Date of last point in light curve in Barycentric Julian Date. For N02, timestamps are in approximate BJD where the correction for the field center to edge difference has not been applied. This correction has a maximum value of 30 seconds, but is typically of order 1-5 seconds. For N04, the timestamps are JD_TT, not BJD.
obsstart Calendar Start Time Calendar Date time-stamp of first point in light curve
obsstop Calendar End Time Calendar Date time-stamp of last point in light curve
kelt_mag† Magnitude [mag] Instrumental KELT magnitude
npts† Points in Statistics Calculation Number of points used in statistics
minvalue Minimum Value of Time Series [mag] Minimum value of magnitude time series
maxvalue Maximum Value of Time Series [mag] Maximum value of magnitude time series
mean Mean Value of Time Series [mag] Mean value of magnitude time series
stddevwrtmean Std Dev of Time Series wrt Mean [mag] Standard deviation with respect to mean of magnitude time series
median† Median value of Time Series [mag] Median value of magnitude time series
stddevwrtmedian† Std Dev of Time Series wrt Median [mag] Standard deviation with respect to median of magnitude time series
n5sigma Number of points > 5 sigma from median Number of points further than 5 standard deviations from the magnitude time series median
f5sigma Fraction of points > 5 sigma from median Fraction of points further than 5 standard deviations from the magnitude time series median
medabsdev Median Absolute Deviation of Time Series [mag] Median absolute deviation of magnitude time series
chisquared Reduced Chi-Squared of Time Series Reduced chi-squared of the magnitude time series with respect to the median
range595† 5-95% Range of Time Series [mag] 5-95 percentile range of magnitude time series

† Default column: these columns display in the interactive table when the table is first loaded, and when Reset Filters is clicked. They are also the default set of columns returned in the API if none are specified. More information about default columns is given in the archive's FAQ.

Last updated: 8 May 2015