Accepted File Formats

The Periodogram service runs calculations on data contained in the Archive as well as on time series uploaded by users. If the service is not accepting your input file, make sure it fits the following formatting rules.

Please note that tables should not exceed 100,000 lines if you intend to use the Periodogram service's interactive table filtering feature.

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Your Input File

• File Name: Acceptable: alpha-numeric characters, underscore ( _ ), hyphen ( - ) and period ( . ). Spaces and quotes are not allowed. File names cannot start with a period (e.g. ".lightcurve.txt").


• Format: ASCII (plain text) with a .txt or .tbl file extension.


• Headers: The service initially assigns the first two non-character, non-zero-deviation columns as the time and data/flux columns, respectively. In absence of a header row, the service assumes the first column is time and the second is flux.


• Column separators: Data may be separated by commas, spaces, tabs or pipes ( | ).


• Blank rows are filtered out.


• NaN values must be explicitly identified in the header (in IPAC table format), or replaced with a blank space.


• Examples: A No Header (Comma Separated) file and its default result, and a With Header (Comma Separated) file and its default result.

Kepler and CoRoT FITS Files

• All FITS table files released by the Kepler and CoRoT missions are accepted


• Examples: Kepler FITS file and its default result, and a CoRoT FITS file and default result (Note: CoRoT file processing time will be long due to the large file size.)

NASA Exoplanet Archive Input File

• Any time series output file returned by the NASA Exoplanet Archive is accepted


• Example: A valid input file in IPAC ASCII format, and the default result.

Last update: 26 April 2018