Mission Overview

TESS Image CAlibrator Full Frame Images ("TICA")

Primary Investigator: Michael Fausnaugh

HLSP Authors: Michael Fausnaugh, Christopher Burke, George Ricker, Roland Vanderspek

Released: 2021-02-02

Updated: 2021-02-02

Primary Reference(s): Fausnaugh et al. 2021

Overview

TESS images that serve as the input to the MIT Quick Look Pipeline (QLP) are provided here.  The team uses a Python package ("tica"), to calibrate the raw pixels and apply astrometric registration in the form of World Coordinate Solutions.

Data Release 1

The first data release consists of calibrated full frame images from Sectors 27 - 30.

Data Products

All TICA calibrated full frame image files are sorted into directories based on the Sector, as a four-digit, zero-padded string preceded by an 's'.  They are then further sorted into subdirectories based on the Camera and CCD numbers.  For example, the files associated with Sector 27 for Camera 2, CCD 3, go into this subdirectory:

s0027/cam2-ccd3/

The catalog of reference stars used to define the WCS are stored in a subdirectory called "ref-stars/" within each Sector directory.

The calibrated full frame images have the following naming convention:

hlsp_tica_tess_ffi_<sector>-<orbit>-<cadence>-<cam>-<ccd>_tess_v01_<extension>

where:

• <sector> = The Sector number as a four-digit, zero-padded number preceded by an 's', e.g., 's0027' for Sector 27.
• <orbit> = The relative orbit number within this Sector, either "o1" or "o2". Note that this does not correlate to the absolute Orbit Number that is tracked and reported in the Data Release Notes and in mission-produced products.
• <cam> = The camera number (1-4), e.g., "cam2" for Camera #2.
• <ccd> = The CCD number (1-4) for that camera, e.g., "ccd1" for CCD #1.
• <extension> = "img.fits" for the calibrated full frame images.

The WCS calibration reference star catalogs have the following naming convention:

hlsp_tica_tess_ffi_<sector>-<cadence>-<cam>-<ccd>_tess_v01_<extension>

where:

• <sector> = The Sector number as a four-digit, zero-padded number preceded by an 's', e.g., 's0027' for Sector 27.
• <cam> = The camera number (1-4), e.g., "cam2" for Camera #2.
• <ccd> = The CCD number (1-4) for that camera, e.g., "ccd1" for CCD #1.
• <extension> = "cat.h5" for the catalogs of stars used to refine the World Coordinate System for the TICA full frame images.

CRM_N Window for CRM min/max rejection For each pixel, the high and low value in a series of "CRM_N" 2-second exposures are rejected in order to remove cosmic rays.
ORBIT_ID Orbit ID, not a physical orbit Only unphysical for commissioning or engineering data.
ACS_MODE Attitude Control System mode Either "FP" for Fine Pointing mode or "CPI" for Course Pointing Inertial mode.
SC_RA Predicted RA Commanded pointing for the Spacecraft. Note that orbit 2 is shifted a few arcseconds relative to orbit 1.
SC_DEC Predicted Dec Commanded pointing for the Spacecraft. Note that orbit 2 is shifted a few arcseconds relative to orbit 1.
SC_ROLL Predicted roll Commanded pointing for the Spacecraft. Note that orbit 2 is shifted a few arcseconds relative to orbit 1.
SC_QUATX Predicted S/C quaternion x Commanded pointing for the Spacecraft. Note that orbit 2 is shifted a few arcseconds relative to orbit 1.
SC_QUATY Predicted S/C quaternion y
SC_QUATZ Predicted S/C quaternion z
SC_QUATQ Predicted S/C quaternion q
TJD_ZERO JD-TDB epoch for which TJD = 0 Corresponds to 2014 December 8 12-00-00 UTC.
STARTTJD Beginning of integration in TJD (days) Time system is in the spacecraft reference frame.
MIDTJD Mid TJD of exposures
ENDTJD End of integration in TJD
EXPTIME Effective exposures corrected for CRM

Equal to "INT_TIME"*0.8*0.99.  Includes the effects of cosmic ray mitigation and frame transfer.

INT_TIME Seconds of integration Total seconds after integration of 2 second exposures.
REQUANT Requant table id Spacecraft configuration table, used for data compression.
DIFF_HUF Huffman table for differenced data Spacecraft configuration table, used for data compression.
PRIM_HUF Huffman table for undifferenced data Spacecraft configuration table, used for data compression.
QUAL_BIT Quality flags Place-holder field; currently not implemented.
SPM SPM number (0, 1, 2, 3) Science Processing Module. Each TESS data mode is collected by a different SPM number. For the FFIs, SPM=2.
TIME Beginning of integration in SCT (seconds) Second counter for spacecraft on-board clock.
CADENCE Cadence number since start of data collection Cadence 0 is approximately defined as the time that TESS was launched, 2018 April 18 23-00-00 UTC.
CRM Whether or not cosmic ray were mitigated If true, cosmic rays were mitigated on-board.
CAMNUM Camera Number Camera Number (1 through 4).
CCDNUM CCD number CCD number (1 through 4).
SCIPIXS   Pixel indices with science data. Pixels outside of this region are collateral pixels, used for calibration.  Always equal to "[45:2092,1:2048]".
GAIN_A e/ADU for CCD Sector A Conversion factor of ADU to photoelectrons.
GAIN_B e/ADU for CCD Sector B
GAIN_C e/ADU for CCD Sector C
GAIN_D e/ADU for CCD Sector D
UNITS Units (ADU or electrons) Always equal to "electrons".
EQUINOX   Always set to epoch 2000.0.
INSTRUME   Always set to "TESS Photometer".
TELESCOP   Always set to "TESS".
FILTER   Always set to "TESS".
MJD-BEG   Same as STARTTJD but in JD.
MJD-END   Same as ENDTJD but in JD.
TESS_X Spacecraft X coord, J2000 (km from barycenter) Position of TESS used for barycentric correction. Matches SPICE conventions: axes are aligned with J2000 ICRS, but the origin is centered at the solar system barycenter. X-axis points at vernal equinox.
TESS_Y Spacecraft Y coord, J2000 (km from barycenter) As above. Y-axis is orthogonal to X.
TESS_Z Spacecraft Z coord, J2000 (km from barycenter)  As above. Z-axis points at north celestial pole.
TESS_VX Spacecraft X velocity (km/s)  Velocity relative ot barycenter.
TESS_VY Spacecraft Y velocity (km/s)  Velocity relative ot barycenter.
TESS_VZ pacecraft Z velocity (km/s)  Velocity relative ot barycenter.
RA_TARG Right Ascension of center of image [deg.]. Same as CRVAL1, matches MAST convention.
DEC_TARG Declination of center of image [deg.]. Same as CRVAL2, matches MAST convention.
RMSA WCS fit resid all targs [arcsec] Metric for quality of WCS fit.
RMSB WCS fit resid bright (Tmag<10) targs [arcsec]
RMSF WCS fit resid faint (Tmag>10) targs [arcsec]
RMSAP WCS fit resid all targs [pixel]
RMSBP WCS fit resid bright (Tmag<10) targs [pixel]
RMSBF WCS fit resid faint (Tmag>10) targs [pixel]
RMSX0 WCS fit resid extra 0 [arcsec]
RMSX1 WCS fit resid extra 1 [arcsec]
RMSX2 WCS fit resid extra 2 [arcsec]
RMSX3 WCS fit resid extra 3 [arcsec]
WCSGDF Fraction of control point targs valid
CTRPCOL Subregion analysis blocks over columns For efficient searching, queries to MAST are broken into subregions.
CTRPROW Subregion analysis blocks over rows As above.
FLXWIN Width in pixels of Flux-weight centroid region
CHECKSUM HDU checksum
DATASUM Data unit checksum

Data file types:

 _img.fits Calibrated full frame image. _cat.h5 Catalog of stars used to refine the WCS for a given Sector+Camera+Chip. These file formats are in HDF5.

Data Access

The calibrated full frame images and catalogs of WCS reference stars are available as bulk download scripts for each Sector via the table below.  The scripts use curl, which is likely already installed on many machines, and if not, is freely available as open source software. The bulk download scripts for the mission-produced products also make use of curl.  You can run each shell script directly in a terminal to retrieve the full set of files, or use a selected subset of the script: each line in the script downloads one TICA file.

Sector-Orbit FFI Bulk Script Ref. Star Bulk Script
27 - Orbit 1 o1-cam1-ccd1  o1-cam1-ccd2  o1-cam1-ccd3  o1-cam1-ccd4
o1-cam2-ccd1  o1-cam2-ccd2  o1-cam2-ccd3  o1-cam2-ccd4
o1-cam3-ccd1  o1-cam3-ccd2  o1-cam3-ccd3  o1-cam3-ccd4
o1-cam4-ccd1  o1-cam4-ccd2  o1-cam4-ccd3  o1-cam4-ccd4
Ref. Star
27 - Orbit 2 o2-cam1-ccd1  o2-cam1-ccd2  o2-cam1-ccd3  o2-cam1-ccd4
o2-cam2-ccd1  o2-cam2-ccd2  o2-cam2-ccd3  o2-cam2-ccd4
o2-cam3-ccd1  o2-cam3-ccd2  o2-cam3-ccd3  o2-cam3-ccd4
o2-cam4-ccd1  o2-cam4-ccd2  o2-cam4-ccd3  o2-cam4-ccd4
Same As Orbit 1
28 - Orbit 1 o1-cam1-ccd1  o1-cam1-ccd2  o1-cam1-ccd3  o1-cam1-ccd4
o1-cam2-ccd1  o1-cam2-ccd2  o1-cam2-ccd3  o1-cam2-ccd4
o1-cam3-ccd1  o1-cam3-ccd2  o1-cam3-ccd3  o1-cam3-ccd4
o1-cam4-ccd1  o1-cam4-ccd2  o1-cam4-ccd3  o1-cam4-ccd4
Ref. Star
28 - Orbit 2 o2-cam1-ccd1  o2-cam1-ccd2  o2-cam1-ccd3  o2-cam1-ccd4
o2-cam2-ccd1  o2-cam2-ccd2  o2-cam2-ccd3  o2-cam2-ccd4
o2-cam3-ccd1  o2-cam3-ccd2  o2-cam3-ccd3  o2-cam3-ccd4
o2-cam4-ccd1  o2-cam4-ccd2  o2-cam4-ccd3  o2-cam4-ccd4
Same As Orbit 1
29 - Orbit 1 o1-cam1-ccd1  o1-cam1-ccd2  o1-cam1-ccd3  o1-cam1-ccd4
o1-cam2-ccd1  o1-cam2-ccd2  o1-cam2-ccd3  o1-cam2-ccd4
o1-cam3-ccd1  o1-cam3-ccd2  o1-cam3-ccd3  o1-cam3-ccd4
o1-cam4-ccd1  o1-cam4-ccd2  o1-cam4-ccd3  o1-cam4-ccd4
Ref. Star
29 - Orbit 2 o2-cam1-ccd1  o2-cam1-ccd2  o2-cam1-ccd3  o2-cam1-ccd4
o2-cam2-ccd1  o2-cam2-ccd2  o2-cam2-ccd3  o2-cam2-ccd4
o2-cam3-ccd1  o2-cam3-ccd2  o2-cam3-ccd3  o2-cam3-ccd4
o2-cam4-ccd1  o2-cam4-ccd2  o2-cam4-ccd3  o2-cam4-ccd4
Same As Orbit 1
30 - Orbit 1 o1-cam1-ccd1  o1-cam1-ccd2  o1-cam1-ccd3  o1-cam1-ccd4
o1-cam2-ccd1  o1-cam2-ccd2  o1-cam2-ccd3  o1-cam2-ccd4
o1-cam3-ccd1  o1-cam3-ccd2  o1-cam3-ccd3  o1-cam3-ccd4
o1-cam4-ccd1  o1-cam4-ccd2  o1-cam4-ccd3  o1-cam4-ccd4
Ref. Star
30 - Orbit 2 o2-cam1-ccd1  o2-cam1-ccd2  o2-cam1-ccd3  o2-cam1-ccd4
o2-cam2-ccd1  o2-cam2-ccd2  o2-cam2-ccd3  o2-cam2-ccd4
o2-cam3-ccd1  o2-cam3-ccd2  o2-cam3-ccd3  o2-cam3-ccd4
o2-cam4-ccd1  o2-cam4-ccd2  o2-cam4-ccd3  o2-cam4-ccd4
Same As Orbit 1

Citations

Please remember to cite the appropriate paper(s) below and the DOI if you use these data in a published work.

Note: These HLSP data products are licensed for use under CC BY 4.0.