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Kepler Ancillary Files
Kepler makes several ancillary data files available to users.
Documentation regarding each file type may be found in the
Kepler Archive Manual.
Cotrending Basis Vectors (CBV) Files
The CBVs may be used to mitigate instrumental signatures in Kepler
light curves when the PDC light curve is inadequate for your science.
One CBV is available each quarter and is listed with links to
download the files along with documentation and sites describing
how to use them.
Pixel Response Function
These data were collected during Kepler commissioning in April, 2009, and used
to build the focal plane characterization models
for Focal Plane Geometry (FPG) and Pixel Response Function (PRF) (see Sections
220.127.116.11 and 18.104.22.168 of the
Kepler Archive Manual).
These data have now been recalibrated using the SOC 9.3
pipeline and packaged as target pixel files, making both the raw and calibrated
pixel data available for the first time. The dither pattern and a discussion of
the small differences between the original and current calibration are provided
in the associated documentation (
The Files are stored online organized by channel number. A separate directory
labelled tar_files contains a gzipped tar file for each channel.
Fine Guidance Sensor Data (FGS)
The FGS data collected throughout the Kepler mission are being made available
to the user community
for scientific analysis as flux and centroid time series, along with a limited
number of FGS full frame images which may be useful for constructing a World
Coordinate System (WCS) or otherwise putting the time series data in context.
Full Frame Image (FFI)
and Engineering Data Search
Images of the entire Kepler Field are typically taken three times
during the quarter and are used to confirm the proper orientation
and placement of the detector and to assess photometer health.
The FFI uncalibrated, calibrated and uncertainties files are available.
FFIs may also be downloaded via anonymous ftp at /pub/kepler/ffi, or
via the browser at
To display individual channels from any of the FFI images,
and overlay various catalogs,
see the FFI_Display page.
The following engineering files may also be retrieved:
Long and Short Cadence Collateral (COLL & COLS) files,
Artifact Removal Pixel (ARP) files,
Background Pixel (BKG) files,
and Reverse Clock (RVC) files.
Commissioning Data: The 2.5 days of commissioning data used to measure
the Pixel Response Function (PRF) and Focal-Plane Geometry (FPG) have been
calibrated and formatted as target pixel files (see
KAM 2.3.2). The
models derived from this data are included in the set of
Focal Plane Characterization Models
described above, but some users may wish to build
alternate models based on this unique data take, which is described