Mission Overview

TESS Data For Asteroseismology Lightcurves (TASOC)


Primary Investigator: Rasmus Handberg

HLSP Authors: Rasmus Handberg, Mikkel Lund, Daniel Huber

Released: 2019-06-10

Updated: 2019-06-10

Primary Reference(s): Lund et al. 2015 & Lund et al. 2017

DOI: 10.17909/t9-4smn-dx89

Citations: See ADS Statistics

Read Me

The TESS Asteroseismic Consortium (TASC) provides this HLSP.  The data platform is known as the TESS Asteroseismic Science Operations Center (TASOC).  The TASC partakes in a coordinated activity called "TESS Data For Asteroseismology" (T'DA), which produces data products for the TASC.



The TESS Asteroseismic Investigation is organized within the TESS Asteroseismic Science Consortium (TASC). The data platform for TASC is provided via the TESS Asteroseismic Science Operations Center (TASOC), hosted at the Stellar Astrophysics Centre (SAC) at Aarhus University, Denmark. TASOC provides long-term storage of all data products. TASC membership is open to the entire TESS community and any member of TASC can apply to become a member of a given working group within TASC. The TASC Coordinated Activity “TESS Data for Asteroseismology” (T’DA) is responsible for maintaining the TASOC portal and for providing data products for TASC.

Data provided with this release have been extracted using the TASOC Photometry pipeline. The TASOC pipeline used to generate the data is open source and available on GitHub.  Before using data prepared by T’DA, the team strongly recommends you read through the TESS data release notes for the Sectors you are interested in, and consult the TESS Instrument Handbook.  Members of the community are welcome to contact the T'DA team if they require custom treatment for a specific target or group of targets. For such cases, they request that the T’DA members involved in this treatment should be offered co-authorship on any paper that results.

Latest Release

The current release (TASOC-0004-01) includes raw aperture photometry light curves for ~1.7 million stars observed in Sectors 1 and 2. No corrections have been applied to the raw light curves. The team is currently implementing a co-trending component of the TASOC pipeline that will be adopted for future releases.


This work has been supported by the TESS Guest Investigator programs G011160 "Light Curves From TESS Full-Frame Images" and G011188 “All-Sky Galactic Archeology With TESS”; the Stellar Astrophysics Centre (SAC) - Funding for the Stellar Astrophysics Centre is provided by The Danish National Research Foundation (Grant agreement no.: DNRF106); the ESA PRODEX programme; The Ohio State University “Distinguished University Scientist” funding.

Data Products

Each TIC object has a FITS file that contains the extracted lightcurve, sorted into directories based on the Sector as a 4-digit, zero-padded string.  Targets that were observed at two-minute cadence are stored in a sub-directory called "tpf/", while those that are only observed in the full frame images at 30-minute cadence are stored in a sub-directory called "ffi/".  Finally, products for a given TIC object are stored in four sub-directories based on splitting the zero-padded, 16-digit TIC identifier into four equal pieces (matching the way mission data are stored on disk at MAST).  Example paths to files are:

s0001/ffi/0000/0004/2194/0013/, for a TIC object with an ID of 421940013 observed in the full frame images from Sector 1.

s0002/tpf/0000/0003/5563/7646/, for a TIC object with an ID of 355637646 observed at two-minute cadence from Sector 2.

Data file naming convention:



  • <id> = 11-digit, zero-padded TIC ID
  • <sector> = "s" followed by the 2-digit, zero-paded sector number; example = "s02"
  • <cadence> = "c" followed by the 4-digit, zero-padded cadence in seconds, example = "c0120"
  • <version> = version number of the file release, example = "v04"

Data file types:

_lc.fits T'DA extracted lightcurve, with no corrections applied to the raw light curves

Data Access

TASOC light curves are available in the MAST Portal (web-based, cross-mission search interface) and Astroquery (Python package to search for and download files from Python scripts you write).

Link to the MAST Portal Webpage

MAST Portal

A web-based interface for cross-mission searches of data at MAST or the Virtual Observatory. Download TASOC light curves for a few targets.
MAST Astroquery

MAST Astroquery

Search for, and retrieve, TASOC data products programmatically based on a list of coordinates or target names.


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.