Trace Gas Orbiter
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| Name | Trace Gas Orbiter |
| Mission type | Planetary science, reconnaissance |
| Operator | European Space Agency, Roscosmos |
| Mission duration | Primary mission ongoing |
| Launch mass | 4,150 kg |
| Launch date | 14 March 2016 |
| Launch vehicle | Proton-M / Briz-M |
| Launch site | Baikonur Cosmodrome |
| Orbit | Mars elliptical, later aerobraking to near-circular |
| Instruments | NOMAD, ACS, CaSSIS, FREND, LaRa |
Trace Gas Orbiter
The Trace Gas Orbiter is a robotic spacecraft designed to study trace gases in the atmosphere of Mars and support communications for surface assets. Built for cooperative service between European Space Agency and Roscosmos, the orbiter launched on a Proton-M rocket from Baikonur Cosmodrome and entered Mars orbit in 2016 as part of the ExoMars programme. It combines high-resolution spectrometers, imaging systems, neutron detectors, and radio science payloads to investigate atmospheric composition, surface processes, and subsurface hydrogen.
Mission overview
The mission formed a central element of the ExoMars programme, conceived after agreements at meetings involving European Space Agency and Roscosmos, and coordinated with international partners including NASA. Following launch on a Proton-M/Briz-M stack from Baikonur Cosmodrome on 14 March 2016, the spacecraft performed cruise-phase activities with trajectory corrections and instrument calibrations while crossing interplanetary space influenced by gravitational interactions from Sun and minor perturbations from Earth and Venus. Mars orbit insertion occurred in October 2016, followed by an extended aerobraking campaign to reach a near-circular science orbit, enabling synergy with other missions such as Mars Express, Mars Reconnaissance Orbiter, and surface assets like ExoMars rover concepts.
Spacecraft design and instruments
The spacecraft bus integrated heritage components from prior European missions, with systems developed by contractors and agencies including Thales Alenia Space, Airbus Defence and Space, and Russian industrial partners. The payload suite included the Nadir and Occultation for Mars Discovery (NOMAD) spectrometer developed by Royal Observatory of Belgium, the Atmospheric Chemistry Suite (ACS) from Space Research Institute (IKI), and the Colour and Stereo Surface Imaging System (CaSSIS) provided by a consortium led by University of Bern. For neutron and hydrogen mapping, the Fine Resolution Epithermal Neutron Detector (FREND) came from Space Research Institute (IKI) and PNPI, while the radio science experiment LaRa involved teams from European institutions and Roscosmos for precise tracking and geodesy. Power came from solar arrays with power electronics and thermal control used radiators and heaters informed by experience from Mars Express and Rosetta.
Science objectives and findings
Primary objectives targeted the detection and characterization of trace gases such as methane, water vapor, and other transient species, particularly to understand potential biological or geological sources and sinks. Instruments like NOMAD and ACS performed solar occultation and nadir observations to map spatial and temporal distributions, linking detections to surface features mapped by CaSSIS and to neutron fluxes measured by FREND that hint at subsurface hydrogen or ice. Early results refined constraints on seasonal methane variability, detected localized enhancements and upper limits that challenged earlier reports from missions including Curiosity, Mars Express, and terrestrial telescopes at Mauna Kea and La Silla. Radio science from LaRa and Doppler tracking contributed to knowledge of Mars' gravity field and rotational parameters relevant to studies by InSight and comparative analyses with data from Mars Reconnaissance Orbiter.
Mission operations and timeline
After separation and cruise, the orbiter executed course corrections during a multi-month interplanetary trajectory that included navigation updates using the Deep Space Network and European tracking facilities like ESOC. Mars orbit insertion in October 2016 was followed by a controlled aerobraking phase using the Martian upper atmosphere to lower apoapsis and circularize the orbit; this phase required coordinated teams at European Space Agency and Roscosmos and drew on atmospheric models from MARS Climate Database and operational experience from Mars Express aerobraking studies. Science operations commenced as instruments reached commissioning readiness, with routine observations organized into planning cycles synced with other Mars missions and delivering data via Planetary Data System-like archives and ESA science portals. The orbiter later supported communications relay for surface missions, maintaining links with ground teams and scheduling passes to assist landers and rovers.
Collaboration and funding
The project arose from bilateral agreements between European Space Agency and Roscosmos under the ExoMars framework, with industrial contracts awarded to prime contractors such as Thales Alenia Space and national space agencies in participating states. Funding combined contributions from European Space Agency member states and Russian federal budgets, supplemented by instrument-level contributions from research institutions including Royal Observatory of Belgium, Space Research Institute (IKI), University of Bern, and national academies. International cooperation involved data-sharing arrangements with agencies like NASA and coordination with missions from Japan Aerospace Exploration Agency and other observatories for simultaneous observations.
Legacy and impact on Mars exploration
The orbiter has influenced subsequent mission planning, instrument design, and cooperative frameworks by providing high-precision atmospheric composition measurements and demonstrating complex international project integration. Data products informed selection criteria for landing sites and science priorities considered by proposed missions and contributed to cross-calibration efforts involving Mars Reconnaissance Orbiter, Mars Express, and ground-based observatories. The mission's relay and operational experience shaped concepts for future sample-return architectures and collaborative models between European Space Agency, Roscosmos, and other partners, reinforcing the role of coordinated orbital assets in enabling comprehensive planetary exploration.