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.

If you are a member of TASC, please log in below...

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.


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:

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.

29th May 2020: Did you miss an online event? Watch the recording!

We have now made it possible to watch recordings of online seminars and conferences (if they were recorded) under "Online Events".
Go see the very interesting seminar given by Tim Bedding on delta Scuti stars here:
If you have recordings of other online events that you would like to either host at TASOC or link to, please feel free to contact TASOC.


8th Jan 2021: TESS Weekly Bulletin: January 8th


Hello TESS followers and welcome to the first news bulletin of the new year! This week we have three papers from the archive, but first a few reminders.

The Cycle 4 proposal deadline is on the 22nd of January, and remember this time we …

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23rd Dec 2020: TESS Weekly Bulletin: December 23rd

STATUS UPDATE: Cycle 4 sectors are now included in the Web TESS Viewing Tool (WTV).

Welcome followers to our holiday edition of the TESS weekly news bulletin. This week we have three papers from the archive. Enjoy!

TESS observations of Cepheid stars: first light results (Plachy et. al., 2020):

The …

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14th Dec 2020: TESS Weekly Bulletin: December 14th

STATUS UPDATE: Don't forget, TESS Cycle 4 proposals are due in January 22nd 2021.

Welcome TESS followers to our weekly news bulletin. This week we have kind of a big one to make up for our absence last week. Enjoy!

TESSVisibility -- When was my favorite star or asteroid observed by …

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TESS mission clock

Launch Countdown:

Where is TESS right now?