(ESA and Russian Mars orbiter-probe launched in 2016)
The Trace Gas Orbiter (TGO,
ExoMars Trace Gas Orbiter or ExoMars TGO)
is a Mars orbiter to measure methane and other
gases of interest in the Martian atmosphere.
It was launched and entered Mars orbit in 2016,
aiming at a 7-year operational life.
It is a project of the European Space Agency (ESA) and Roscosmos,
as part of their ExoMars program of Mars exploration.
Launched and transported with it was Schiaparelli, a prototype
landing vehicle that landed harder than planned, unable to function
afterward.
TGO instruments:
CaSSIS - Colour and Stereo Surface Imaging System.
FREND - Fine Resolution Epithermal Neutron Detector.
MAGE (the Mars Atmospheric and Gravity Experiment) is an
investigation using data extracted from its radio-based
navigation/tracking, in particular to retrieve
gravity anomaly data, including changes in ice caps
over time, and also data regarding the atmosphere from
its effect on aerobraking (modifying the orbit using
interaction with the atmosphere).