NASA's TESS

NASA's TESS
Name	TESS
Operator	NASA
Mission type	Space telescope, Exoplanet survey
Launch date	2018-04-18
Launch vehicle	Falcon 9
Launch site	Cape Canaveral Space Force Station
Orbit	High Earth elliptical resonant orbit (13.7-day)
Telescope diameter	10.5 cm (per camera)
Status	Operational

NASA's TESS

NASA's TESS is a NASA-led space observatory designed to perform an all-sky survey for exoplanets using the transit method. Developed and managed by NASA in partnership with institutions such as the Massachusetts Institute of Technology, the mission builds on heritage from missions like Kepler and technological advances from programs including Explorer program. TESS aims to identify small planets around bright nearby stars to enable follow-up by observatories such as James Webb Space Telescope, Hubble Space Telescope, and ground-based facilities like Keck Observatory and European Southern Observatory.

Overview

TESS (Transiting Exoplanet Survey Satellite) was conceived to execute a wide-field survey over nearly the entire sky, focusing on bright, nearby stars cataloged by programs such as Gaia and Two Micron All-Sky Survey. The spacecraft carries four wide-field cameras derived from optical designs used by projects at institutions like MIT Lincoln Laboratory and instrumentation groups with ties to NASA Goddard Space Flight Center and Ames Research Center. TESS's strategy complements predecessor efforts exemplified by Kepler and follow-on concepts like PLATO while enabling characterization campaigns with facilities including Subaru Telescope, Magellan Telescopes, and space assets such as Spitzer Space Telescope (until its retirement).

Mission History and Development

The TESS concept emerged from recommendations by advisory panels including the Decadal Survey and tasking from NASA Science Mission Directorate. Led by principal investigators and engineering teams at MIT, with project management at NASA Goddard Space Flight Center and flight systems from industry partner Orbital Sciences Corporation (now part of Northrop Grumman), the mission progressed through competitive solicitations like those under the Astrophysics Explorer program. Key milestones include selection in 2013, integration and testing at facilities including Lockheed Martin Space Systems testbeds, and launch aboard a SpaceX Falcon 9 from Cape Canaveral Space Force Station in April 2018. The insertion into a 2:1 resonant high Earth orbit followed trajectory design work by teams familiar with dynamics studied in missions such as ARTEMIS and STEREO.

Spacecraft and Instruments

The TESS observatory hosts four identical cameras arrayed to provide a combined field of view comparable to roughly 2300 square degrees, employing CCD detectors and optics optimized for the red-optical bandpass favored by M-dwarf and K-dwarf surveys. The payload was developed by teams at MIT Kavli Institute for Astrophysics and Space Research, with detector electronics and readout systems produced by contractors who previously worked on instruments for WISE and Kepler. The spacecraft bus integrates avionics, reaction wheels, a star-tracker suite comparable to those used on Hubble Space Telescope servicing flights and attitude control architectures similar to Mars Reconnaissance Orbiter, while thermal and power systems trace heritage to designs used on missions such as Landsat and ICESat-2.

Science Objectives and Discoveries

TESS's primary scientific goals are to discover transiting exoplanets around nearby bright stars and to produce a catalog of targets suitable for mass and atmospheric follow-up by observatories like JWST and ground-based arrays including ALMA and Very Large Telescope. Early discoveries included a diversity of planets such as sub-Neptunes, super-Earths, and multi-planet systems orbiting stars cataloged in surveys like APOGEE and RAVE. Notable findings tie into communities working on stellar characterization from Gaia parallaxes and spectroscopic campaigns at facilities such as LAMOST and Sloan Digital Sky Survey. TESS also contributes to time-domain astrophysics, detecting stellar flares, eclipsing binaries, and transient phenomena studied by collaborations involving Zwicky Transient Facility and Pan-STARRS.

Operations and Data Processing

TESS operations are conducted by mission teams at MIT and NASA Ames Research Center, with spacecraft communications supported via the Deep Space Network and data downlinks coordinated through facilities analogous to those used by missions like Voyager and Cassini–Huygens. Raw and processed photometric data products feed pipelines developed in partnership with archives such as the Mikulski Archive for Space Telescopes and community tools used by consortia associated with Exoplanet Archive and citizen-science platforms like Planet Hunters. Data processing pipelines implement systematics correction and transit-search algorithms that draw on methods used in Kepler science, and follow-up validation often engages radial-velocity resources at HARPS and HIRES.

Collaborations and Legacy

TESS fosters a broad collaborative ecosystem spanning academic groups at institutions including Harvard University, University of California, Berkeley, Cornell University, and international partners such as European Space Agency investigators and teams from Japan Aerospace Exploration Agency. The mission's legacy includes an extensive catalog of bright transiting exoplanet candidates prioritized for atmospheric characterization with JWST, coordinated follow-up strategies with facilities like SOAR Telescope and Gemini Observatory, and enabling technology demonstrations that inform future missions such as HabEx and LUVOIR concepts discussed within the Astrophysics Decadal Survey. TESS has also seeded educational and public outreach initiatives tied to organizations like SETI Institute and citizen-science platforms promoting engagement with discoveries across the exoplanet community.

Category:Exoplanet search missions