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*Kazachok* lander
Names	ExoMars 2020 Surface Platform
Mission type	Mars lander and rover
Operator	Roscosmos and ESA
Website	exploration.esa.int/web/mars/-/56933-exomars-2020-surface-platform
Mission duration	Planned: 2 Earth years
Spacecraft properties
Manufacturer	Lavochkin
Launch mass	Lander: 827.9 kg (1,825 lb) ; Rover: 310 kg (680 lb)
Payload mass	Lander: 45 kg (99 lb)
Power	Solar panels
Mars lander
Landing site	Oxia Planum
	ExoMars programme ← Trace Gas Orbiter ; and Schiaparelli lander

The ExoMars Kazachok (Russian: Казачок; formerly ExoMars 2020 Surface Platform^[2]) was a planned robotic Mars lander led by Roscosmos, part of the ExoMars 2022 joint mission with the European Space Agency. Kazachok translates as "Little Cossack", and is also the name of an East Slavic folk dance.

The plan called for a Russian Proton-M rocket to launch the Russian-built lander that to deliver the Rosalind Franklin rover to the surface of Mars.^[6] Once safely landed, Kazachok would have deployed the rover and start a one Earth-year mission to investigate the surface environment at the landing site.^[7]

The spacecraft was scheduled to launch in 2020 and land on Mars in mid 2021,^[6] but due to the failure of the entry parachutes to pass testing, the launch was moved to 20 September 2022.^[8]

In March 2022, amidst the backdrop of the Russian invasion of Ukraine, the European Space Agency voted to suspend their cooperation with Russia on the ExoMars mission.^[9]

Scientific instruments

The Kazachok lander project was led by Roscosmos, but its scientific payload would also have included two European instruments and European contributions to four Russian-led instruments. The payload mass was to be about 45 kg and consists of the following instruments (plus an instrument interface and memory unit (BIP)):^[7]^[3]

The Lander Radioscience experiment (LaRa) would study the internal structure of Mars and help to understand the sublimation/condensation cycle of atmospheric CO₂, and would make precise measurements of the rotation and orientation of the planet by monitoring two-way Doppler frequency shifts between the lander and Earth.^[10] It would have also detected variations in angular momentum due to the redistribution of masses, such as the migration of ice from the polar caps to the atmosphere. Developed by Belgium.
The Habitability, Brine, Irradiation and Temperature (HABIT) package would investigate the amount of water vapour in the atmosphere, daily and seasonal variations in ground and air temperatures, and the UV radiation environment. Developed by Sweden.
Meteorological package (MTK). Led by Russia. The package would incorporate the following sensors:
- Pressure and humidity sensors (METEO-P, METEO-H).^[11] Developed by Finland. The sensors have extensive heritage from those in the Curiosity rover, Schiaparelli lander and Phoenix lander.^[11]
- Meteorological boom, incorporating: 3 atmospheric temperature sensors; Solar Irradiance (SIS20) and Dust (DS20) sensors (developed by Spain); METEO-H (see above), and wind sensor.
- Anisotropic Magneto-Resistance (AMR) sensor to measure magnetic fields. Developed by Spain.
- Optical Depth Sensor (ODS).
- Microphone.
- Descent and Landing Unit (MTK-L) for atmospheric temperature and pressure, and acceleration & angular rate.
- Upward-looking LIDAR.
A magnetometer (MAIGRET), developed by Russia. The instrument would incorporate the Wave Analyser Module (WAM),^[12] developed by the Czech Republic.
A set of four cameras (TSPP) to characterise the landing site environment. Developed by Russia.
An IR Fourier spectrometer (FAST) to study the atmosphere. Developed by Russia.
Active Detection of Radiation of Nuclei-ExoMars (ADRON-EM). Developed by Russia, including also a radiation dosimeter (Liulin-ML) from Bulgaria.
Multi-channel Diode-Laser Spectrometer (M-DLS) for atmospheric investigations. Developed by Russia.
Radio thermometer (RAT-M) for soil temperatures. Developed by Russia.
Dust particle size, impact, and atmospheric charging instrument suite (PK). Developed by Russia, including also contributions from Italy (MicroMED) and France (electrical conductivity sensor).
A seismometer (SEM). Developed by Russia.^[13]
Gas chromatography–mass spectrometry (MGAK) for atmospheric analysis. Developed by Russia.

Power source

The science and communication instruments on the lander would have been powered by solar panels and rechargeable batteries.^[4] The automated voltage power system is being developed and build by ISS Reshetnev.^[4]

Russia previously evaluated the option of using a radioisotope thermoelectric generator (RTG) to power the science instruments,^[14] and a radioisotope heater unit (RHU) to provide thermal control while on the frozen Martian surface.^[15]

Landing site selection

Oxia Planum, near the equator, was the proposed landing site for its smooth surface and potential to preserve biosignatures

After a review by an ESA-appointed panel, a short list of four sites was formally recommended in October 2014 for further detailed analysis:^[16]^[17]

On 21 October 2015, Oxia Planum was chosen as the preferred landing site for the ExoMars rover, now the Rosalind Franklin rover, assuming a 2018 launch. But since the launch was postponed to 2020, Aram Dorsum and Mawrth Vallis are also being considered.^[18]^[19] ESA convened further workshops to re-evaluate the three remaining options and in March 2017 selected two sites to study in detail:

After deliberation, ESA selected Oxia Planum to be the landing site in November 2018.^[20]^[21]