# Welcome to TESS Asteroseismic Science Operations Center

The TESS Asteroseismic Science Operations Center (TASOC) provides asteroseismological data from the NASA TESS mission to astronomers who are members of the TESS Asteroseismic Science Consortium (TASC). It is also the platform used to facilitate the international collaborations within TASC.

In order to have access to TASOC you have to be a member of TASC. Please see the "New TASC member" page on how to become a member.

## News

### 22nd Feb 2021: Fifth data release of TESS Data for Asteroseismology (raw and corrected photometry for Sectors 1-6)

We are pleased to announce the fifth release of TESS data for asteroseismology from the TASC Coordinated Activity T'DA.

For this release, raw and systematics corrected photometry is provided based on Full Frame Image (FFI; 30-min) and Target Pixel File (TPF; 2-min) data from TESS Sectors 1-6. All data is accessible via the TASOC website. In total a little over 12 million light curves are provided with this release.

For the first time, this release provides systematics corrected data using two different methods: Co-trending Basis Vectors (CBVs) and Ensemble photometry. Most observed targets will thus have two light curves, and we encourage you to check both corrections for the optimal light curve for your science. You can read more about the photometric pipeline and the two correction methods, and their individual pros and cons, in the T'DA papers, which can be found here: Photometry, Corrections.

For more details, please read the data release notes, which can be found here.

To optimize the TASOC pipeline we are very interested in knowing of any issues or shortcomings you find. Therefore, if you have any comments or questions regarding the processed data, please let us know.

Our strategy for the next TASOC data release is to focus on the TESS Sectors overlapping with the Kepler field of view. After that we are aiming for a more rapid release schedule where the following sectors will be released one after the other.

### 15th Jun 2020: Reprocessed TESS data for sectors 1-19

As you may have read in the news from the TESS Science Support Center, the TESS data from sectors 1-19 are going to be reprocessed and updated in the coming months. This will mean that as data is re-released, they will no longer be available on the MAST archive.
But fear not! On the TASOC archive, we will make sure that all previous versions of data will always be available, so you can always reproduce your TESS results.
See more here:
https://heasarc.gsfc.nasa.gov/docs/tess/reprocessed-tess-data-coming-soon.html

### 10th Jun 2020: Scheduled maintenance today, 13:00-16:00 CEST

We are doing some scheduled maintenance of our systems this afternoon, so data downloads will not be available for some time during that period.

## TESS News

### 1st Jun 2021: TESS Weekly Bulletin: June 01st

STATUS UPDATE: Orbit 1 of Sector 38 is now available to download as a TICA product from MAST

Welcome TESS followers this weeks news bulletin in which we look at three papers from the archive,

TIC 172900988: A Transiting Circumbinary Planet Detected in One Sector of TESS Data (Kostov et …

### 24th May 2021: TESS Weekly Bulletin: May 24th

STATUS UPDATE: Orbit 2 of Sector 37 is now available to download as a TICA product from MAST

Welcome TESS followers this weeks news bulletin in which we look at three papers from the archive,

TESS and HARPS reveal two sub-Neptunes around TOI 1062 (Otegi et al., 2021) :

In this …

### 4th May 2021: TESS Cycle 4 selections

Hello and welcome TESS followers to this special news bulletin! Here we will discuss the results of the Cycle 4 proposal season.

The Cycle 4 review was held earlier this year in March, with 146 proposals submitted. Of these proposals 12 were large, 110 small, and 24 mini - our most …

## TESS mission clock

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