Nasa’s Transiting Exoplanet Survey Satellite (TESS), United States of America


The Transiting Exoplanet Survey Satellite (TESS) is being developed by Nasa's Goddard Space Flight Centre in association with the Massachusetts Institute of Technology (MIT).

The satellite is aimed at finding the exoplanets orbiting the brightest stars just outside the solar system. It will be placed at 17 Earth-radii perigee, and 59 Earth-radii apogee orbital position.

Scheduled to be launched in March 2018, the TESS will have a mission life of two years.

TESS design and development

TESS will have a launch mass of 350kg and include two-wing solar arrays with a capacity of 400W. It will include three-axis stabilisation, with four Hydrazine thrusters and four wheel fine-pointing attitude control systems.

The satellite will be based on Orbital ATK's LEOStar™-2 platform, which is appropriate for scientific, remote-sensing and other applications.

Orbital ATK was awarded the contract for the development, observatory integration and testing of the satellite. Assembly and construction of the spacecraft as well as testing of the thermal chamber were completed in August 2016.

Other partners involved in the development of the TESS include the MIT Kavli Institute for Astrophysics and Space Research, MIT's Lincoln Laboratory, Nasa's Ames Research Centre, the Harvard-Smithsonian Centre for Astrophysics, the Aerospace Corporation, and the Space Telescope Science Institute.

The total estimated cost for the development and launch of the TESS is $87m.

Instruments on-board TESS

The satellite will be equipped with four field-of-view charge-coupled device (CCD) cameras manufactured at MIT Lincoln Lab. The athermal design cameras will have 100mm pupil diameter, 16.8 megapixel, low-noise, low-power detector, lens assembly with seven optical elements. It will offer a 24° x 24° field-of-view.

TES satellite mission details

The satellite will search for exoplanets, which are revolving bright stars near the solar system. It will survey the space for more than two years by dividing it into 26 different sectors.

The cameras fitted on the spacecraft will gaze at each sector for up to 27 days. It will map the northern hemisphere in the first year and the southern hemisphere in the second, and will look at more than 200,000 of the brightest stars.

TESS will provide prime targets for additional and detailed study along with the James Webb Space Telescope (JWST) and other large telescopes in future. It will study stars, which are 30 to 100 times brighter than those examined in the Kepler mission and K2 follow-up survey.

"It will catalogue more than 3,000 exoplanet candidates, including 500 Earth-sized and super Earth planets."

The satellite will monitor more than 500,000 stars during the two-year mission period and record momentary drops in brightness caused by planetary transits. It will catalogue more than 3,000 exoplanet candidates, including 500 Earth-sized and super Earth planets.

It will also find small rock-and-ice planets revolving in a different range of stellar types, including rocky worlds in the habitable zones of the host stars. In addition, the satellite will allow scientists to perform research on 20,000 additional objects through the Guest Investigator programme.

Details of the launch vehicle TESS

The TES satellite launch contract was awarded to SpaceX in December 2014. The satellite will be launched aboard Falcon 9 v1.1 launch vehicle. The rocket will place the satellite in orbit after a two-stage lift-off.

The first stage of launch will be powered by nine Merlin 1 D engines, while the second stage will be powered by one MvacD engine.

Launch operations of the satellite will be performed from the Cape Canaveral Air Force Station in Florida, US.

Ground control station for TESS

The ground control system for the TES satellite will include eight different facilities located around the US, which will work as one unified team to operate and process the collected scientific data.

The satellite mission operations will be carried out by Orbital ATK's mission operations centre (MOC) located in Dulles Virginia, Washington, US, which will communicate with TESS observatory for commanding and telemetry.