LaRa

LaRa (Lander Radioscience)Operator| ESA & Roscosmos

|

Manufacturer| Antwerp Space N.V.[1]
Instrument type| Radio science/Transponder
Function| Monitor the rotation and orientation of Mars
Mission duration| Planned: ≥ 1 Earth year[2]
Website| lara.oma.be
Properties
Mass| less than 2.2 kg[3]
Dimensions| Length: 23 cm for the transponder (7-9 cm for the antennas)[3]
Power consumption| ≈ 40 W[3]
Spectral band| X band (uplink: 7.174 GHz, downlink: 8.428 GHz)
Host spacecraft
Spacecraft| Kazachok
Operator| ESA & Roscosmos
Launch date| August–October 2022[4]
Rocket| Proton-M/Briz-M
Launch site| Baikonur

LaRa (Lander Radioscience) is a Belgian radio science experiment that will be placed onboard Kazachok, planned to be launched in 2022.[2][4] LaRa will monitor the Doppler frequency shift of a radio signal traveling between the Martian lander and the Earth. These Doppler measurements will be used to precisely observe the orientation and rotation of Mars, leading to a better knowledge of the internal structure of the planet.[5][6]

## Contents

* 1 Instrument description
* 2 Scientific objectives
* 3 See also
* 4 References
* 5 External links

## Instrument description

LaRa will obtain coherent two-way Doppler measurements from the X band radio link between Kazachok and large antennas on Earth, like those of the Deep space network. The relative radial velocity between the Earth and the Martian lander is inferred from Doppler shifts measured at the Earth ground stations. Masers at the Earth's ground stations ensure the frequency stability.[6] Véronique Dehant, scientist at the Royal Observatory of Belgium, is the Principal Investigator of the experiment.[2][7]

Antwerp Space N.V.,[1] a subsidiary of OHB SE, is the manufacturer of the LaRa instrument.[2] The main parts of the transponder are the coherent detector, the transmitter with the Solid-State Power Amplifier, the micro controller unit, the receiver and the power supply unit. The Allan deviation (quantifying the frequency stability of the signal) of the measurements is expected to be lower than 10−13at 60 second integration time.

The LaRa high-performance antennas were designed at the Université catholique de Louvain in Belgium to obtain an optimal antenna gain centered on an elevation (angle of the line-of-sight from the lander to Earth) of about 30° to 55°.[8] There will be three antennas: two for the transmission (for redundancy purposes) and one for reception.[9] Cables connect the transponder to the three antennas.

Belgium and the Belgian Federal Science Policy Office (BELSPO) fund the development and the manufacturing of LaRa through ESA's PRODEX program.[10]

## Scientific objectives

LaRa will study the rotation of Mars as well as its internal structure, with particular focus on its core. It will observe the Martian precession rate, the nutations, and the length-of-day variations, as well as the polar motion. The precession and the nutations are variations in the orientation of Mars's rotation axis in space, the precession being the very long term motion (about 170 000 years for Mars) while the nutations are the variations with a shorter period (annual, semi-annual, ter-annual,... periods). A precise measurement of the Martian nutations enables an independent determination of the size and density of the liquid core because of a resonance in the nutation amplitudes.[11] The resonant amplification of the low-frequency forced nutations depends sensibly on the size, moment of inertia, and flattening of the core. This amplification is expected to correspond to a displacement of between a few to forty centimeters on Mars surface.[12] Observing the amplification allows to confirm the liquid state of the core and to determine some core properties.

LaRa will also measure variations in the rotation angular momentum due to the redistribution of masses, such as the migration of ice from the polar caps to the atmosphere and the sublimation/condensation cycle of atmospheric CO2.[13]

## See also

* Rotation and Interior Structure Experiment, a similar radio science experiment by the InSight Mars lander

## References

1. ↑ 1.0 1.1 "LaRa". Antwerp Space. https://www.antwerpspace.be/en/products/flight-products/lara.
2. ↑ 2.0 2.1 2.2 2.3 "Exomars 2020 surface platform". European Space Agency. http://exploration.esa.int/mars/56933-exomars-2020-surface-platform/.
3. ↑ 3.0 3.1 3.2 "LaRa instrument characteristics". Royal Observatory of Belgium. https://lara.oma.be/instrument.
4. ↑ 4.0 4.1 "N° 6–2020: ExoMars to take off for the Red Planet in 2022" (Press release). ESA. 12 March 2020. Retrieved 12 March 2020.
5. ↑ Dehant, Veronique; Folkner, William; Renotte, Etienne; Orban, Daniel; Asmar, Sami; Balmino, Georges; Barriot, Jean-Pierre; Benoist, Jeremy et al. (2009). "Lander radioscience for obtaining the rotation and orientation of Mars.". Planetary and Space Science (Planetary and Space Science, Volume 57, Issues 8–9, July 2009, Pages 1050-1067.) 57 (8–9): 1050–1067. doi:10.1016/j.pss.2008.08.009. Bibcode: 2009P&SS...57.1050D.
6. ↑ 6.0 6.1 "LaRa Homepage". Royal Observatory of Belgium. https://lara.oma.be.
7. ↑ "LaRa Team". Royal Observatory of Belgium. https://lara.oma.be/team.
8. ↑ "Space Antennas – Antennas Group". Université Catholique de Louvain. 15 May 2018. https://sites.uclouvain.be/AntennaGroup/research/space-antennas/.
9. ↑ LaRa (Lander Radioscience) on the ExoMars 2020 Surface Platform. (PDF) Véronique Dehant, Sébastien Le Maistre, Rose-Marie Baland, etal. EPSC Abstracts. Vol. 12, EPSC2018-31, 2018. European Planetary Science Congress 2018.
10. ↑ "Belgium and LaRa on their way to Mars" (Press release). Royal Observatory of Belgium. 14 May 2018. Retrieved 21 December 2018.
11. ↑ Dehant, V.; Van Hoolst, T.; Defraigne, P. (January 2000). "Computation of Mars' transfer functions for nutations, tides and surface loading". Physics of the Earth and Planetary Interiors 117 (1–4): 385–395. doi:10.1016/S0031-9201(99)00108-9. Bibcode: 2000PEPI..117..385D.
12. ↑ Yseboodt, M.; Dehant, V.; Péters, M.-J. (2017). "Signatures of the Martian rotation parameters in the Doppler and range observables". Planetary and Space Science 144: 74–88. doi:10.1016/j.pss.2018.03.020.
13. ↑ Karatekin, O.; de Viron, O.; Lambert, S.; Dehant, V.; Rosenblatt, P.; Van Hoolst, T.; Le Maistre, S. (August 2011). "Atmospheric angular momentum variations of Earth, Mars and Venus at seasonal time scales". Planetary and Space Science 59 (10): 923–933. doi:10.1016/j.pss.2010.09.010. Bibcode: 2011P&SS...59..923K.

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ExoMars programme

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Instruments|

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ExoMars 2020|

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Instruments|

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features|

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Astronomy|

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Geography of Mars and geology of Mars

Cartography

| Regions|

* Abalos Undae
* Aspledon Undae
* Arabia Terra
* Cerberus
* Cydonia
* Eridania Lake
* Hyperboreae Undae
* Ogygis Undae
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* Quadrangles
* Sinus Meridiani
* Siton Undae
* Tempe Terra
* Terra Cimmeria
* Terra Sabaea
* Tharsis
* Vastitas Borealis

|

Quadrangles|

* Aeolis
* Amazonis
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* Arabia
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* Argyre
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* Memnonia
* Noachis
* Oxia Palus
* Phaethontis
* Phoenicis Lacus
* Sinus Sabaeus
* Syrtis Major
* Tharsis
* Thaumasia

Geology

| Surface features|

* Brain terrain
* Carbonates
* Chaos terrain
* Color
* Composition
* Concentric crater fill
* Dark slope streak
* Dichotomy
* Dune fields
* Hagal
* Nili Patera
* Fretted terrain
* Geysers
* Glaciers
* Groundwater
* Gullies
* Inverted relief
* Lakes
* Lava tubes
* Lineated valley fill (LVF)
* Lobate debris apron
* North Polar Basin
* Ocean hypothesis
* Ore resources
* Outflow channels
* Polar caps
* Ring mold craters
* Rootless cones
* Scalloped topography
* Seasonal flows
* Soil
* Spherules
* Surface
* Swiss cheese features
* Terrain softening
* Tholus
* Upper plains unit
* Valley networks
* Water
* Yardangs

|

History|

* Amazonian
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* Noachian
* Volcanology
* Observation history
* Canals (list)
* Classical albedo features

Rocks observed|

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* Martian meteorites found on Earth
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* List

Topography

| Mountains and
volcanoes

(list by height)

* Acidalia Colles
* Alba Mons
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* Tyrrhenus Mons
* Ulysses Tholus
* Uranius group
* Uranius Mons
* Ceraunius Tholus
* Uranius Tholus

|

Plains and
plateaus|

* Acidalia Planitia
* Aeolis Palus
* Amazonis Planitia
* Arcadia Planitia
* Argyre Planitia
* Chryse Planitia
* Daedalia Planum
* Elysium Planitia
* Eridania Planitia
* Hellas Planitia
* Hesperia Planum
* Icaria Planum
* Isidis Planitia
* Lunae Planum
* Meridiani Planum
* Oxia Planum
* Planum Australe
* Planum Boreum
* Syria Planum
* Syrtis Major Planum
* Utopia Planitia
* Eden Patera
* Orcus Patera
* Peneus Patera
* Pityusa Patera

Canyons and
valleys|

* Aram Chaos
* Arsia Chasmata
* Aromatum Chaos
* Atlantis Chaos
* Aureum Chaos
* Candor Chasma
* Chasma Boreale
* Coprates Chasma
* Echus Chasma
* Eos Chaos
* Eos Chasma
* Galaxias Chaos
* Ganges Chasma
* Gorgonum Chaos
* Hebes Chasma
* Hydaspis Chaos
* Hydraotes Chaos
* Iani Chaos
* Ister Chaos
* Ius Chasma
* Juventae Chasma
* Melas Chasma
* Ophir Chasma
* Tithonium Chasma

* List of valles
* Apsus
* Ares
* Arnus
* Asopus
* Athabasca
* Auqakuh
* Bahram
* Buvinda
* Dao
* Enipeus
* Frento
* Granicus
* Green Valley
* Harmakhis
* Hebrus
* Her Desher
* Hrad
* Huo Hsing
* Hypanis
* Iberus
* Indus
* Ituxi
* Kasei
* Labou
* Ladon
* Lethe
* Licus
* Louros
* Ma'adam
* Mad
* Maja
* Mamers
* Mangala
* Marineris
* Labes
* Marte
* Maumee
* Mawrth
* Minio
* Naktong
* Nanedi
* Niger
* Nirgal
* Padus
* Paraná
* Patapsco
* Peace
* Rahway
* Ravi
* Reull
* Sabis
* Sabrina
* Samara
* Scamander
* Shalbatana
* Simud
* Stura
* Tader
* Tinia
* Tinjar
* Tiu
* Tyras
* Uzboi
* ULM
* Vedra
* Verde
* Warrego

Fossae, mensae
rupes and labyrinthi|

* Amenthes Fossae
* Ceraunius Fossae
* Cerberus Fossae
* Coloe Fossae
* Cyane Fossae
* Elysium Fossae
* Hephaestus Fossae
* Icaria Fossae
* Labeatis Fossae
* Mangala Fossa
* Mareotis Fossae
* Medusae Fossae
* Memnonia Fossae
* Nili Fossae
* Olympica Fossae
* Oti Fossae
* Sirenum Fossae
* Tantalus Fossae
* Tempe Fossae
* Tithonium Fossae
* Tractus Fossae
* Ulysses Fossae
* Aeolis Mensae
* Ausonia Mensa
* Capri Mensa
* Cydonia Mensae
* Deuteronilus Mensae
* Ganges Mensa
* Nilosyrtis Mensae
* Protonilus Mensae
* Sacra Mensa
* Claritas Rupes
* Olympus Rupes
* Rupes Tenuis
* Angustus Labyrinthus
* Noctis Labyrinthus

Catenae and
craters|

* Artynia Catena
* Tithoniae Catenae
* Tractus Catena
* Adams
* Agassiz
* Airy
* Airy-0
* Aniak
* Antoniadi
* Arandas
* Argo
* Arkhangelsky
* Arrhenius
* Asimov
* Bacolor
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* Baldet
* Baltisk
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* Beagle
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* Beer
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* Bianchini
* Boeddicker
* Bok
* Bond
* Bonestell
* Bonneville
* Brashear
* Briault
* Burroughs
* Burton
* Campbell
* Canso
* Cassini
* Caxias
* Cerulli
* Chafe
* Chapais
* Chincoteague
* Chryse Alien
* Clark
* Coblentz
* Columbus
* Copernicus
* Corby
* Crewe
* Crivitz
* Crommelin
* Cruls
* Curie
* Da Vinci
* Danielson
* Darwin
* Davies
* Dawes
* Dejnev
* Denning
* Dilly
* Dinorwic
* Douglass
* Dromore
* Du Martheray
* Eagle
* Eberswalde
* Eddie
* Ejriksson
* Emma Dean
* Endeavour
* Matijevic Hill
* Endurance
* Erebus
* Escalante
* Eudoxus
* Fenagh
* Fesenkov
* Firsoff
* Flammarion
* Flaugergues
* Focas
* Fontana
* Fournier
* Fram
* Galdakao
* Gale
* Galle
* Garni
* Gasa
* Gilbert
* Gill
* Gledhill
* Gold
* Graff
* Green
* Grindavik
* Gusev
* Apollo 1 Hills
* Chaffee
* Grissom
* White
* Columbia Hills
* Husband
* McCool
* Sleepy Hollow
* Hadley
* Haldane
* Hale
* Halley
* Hartwig
* Heaviside
* Heimdal
* Heinlein
* Helmholtz
* Henry
* Herschel
* Hipparchus
* Holden
* Holmes
* Hooke
* Huggins
* Hussey
* Hutton
* Huxley
* Huygens
* Iazu
* Ibragimov
* Inuvik
* Janssen
* Jarry-Desloges
* Jeans
* Jezero
* Jezža
* Joly
* Jones
* Kaiser
* Keeler
* Kepler
* Kinkora
* Kipini
* Knobel
* Koga
* Korolev
* Kufra
* Kuiper
* Kunowsky
* Lambert
* Lamont
* Lampland
* Lassell
* Lau
* Le Verrier
* Li Fan
* Liais
* Lipik
* Liu Hsin
* Llanesco
* Lockyer
* Lod
* Lohse
* Lomonosov
* Lowell
* Lyell
* Lyot
* Mädler
* Magelhaens
* Maggini
* Main
* Mandora
* Maraldi
* Mariner
* Marth
* Martz
* Masursky
* Maunder
* McLaughlin
* McMurdo
* Mellish
* Mendel
* Mie
* Milankovic
* Millochau
* Mitchel
* Miyamoto
* Mohawk
* Mojave
* Molesworth
* Montevallo
* Moreux
* Müller
* Nansen
* Nereus
* Newton
* Nhill
* Nicholson
* Niesten
* Nipigon
* Onon
* Orson Welles
* Oudemans
* Palana
* Pangboche
* Pasteur
* Penticton
* Perepelkin
* Peridier
* Persbo
* Pettit
* Phillips
* Pickering
* Playfair
* Pollack
* Poona
* Porter
* Porth
* Priestley
* Proctor
* Ptolemaeus
* Puńsk
* Quenisset
* Rabe
* Radau
* Rahe
* Rayleigh
* Redi
* Renaudot
* Reuyl
* Reynolds
* Richardson
* Ritchey
* Robert Sharp
* Roddenberry
* Ross
* Rossby
* Rudaux
* Russell
* Rutherford
* Sagan
* Saheki
* Santa Maria
* Schaeberle
* Schiaparelli
* Schmidt
* Secchi
* Semeykin
* Sharonov
* Sibu
* Sinton
* Sitka
* Sklodowska
* Slipher
* Smith
* South
* Spallanzani
* Srīpur
* Steno
* Stokes
* Stoney
* Suess
* Suzhi
* Tarsus
* Taytay
* Teisserenc de Bort
* Terby
* Thila
* Thira
* Tikhonravov
* Tikhov
* Timbuktu
* Tombaugh
* Tooting
* Trouvelot
* Troy
* Trud
* Trumpler
* Tugaske
* Tycho Brahe
* Tyndall
* Udzha
* Vernal
* Very
* Victoria
* Cape Verde
* Vinogradov
* Vinogradsky
* Virrat
* Vishniac
* Vogel
* Von Kármán
* Wallace
* Wegener
* Weinbaum
* Wells
* Williams
* Winslow
* Wirtz
* Wislicenus
* Wright
* Yuty
* Zumba
* Zunil

* v
* t
* e

Science instruments on satellites and spacecraft

Radar|

* Cassini–Huygens
* Magellan
* Paz
* Pioneer Venus Orbiter
* REASON
* SELENE
* SHARAD
* MARSIS
* Venera 4
* 8
* 9
* 10
* 15
* 16
* WISDOM

Radio science|

* Akatsuki
* Cassini–Huygens
* Europa-UVS
* ExoMars lander
* Galileo
* InSight
* Kaguya
* Magellan
* Mariner 2
* 3
* 4
* 5
* 6, 7
* 9
* 10
* Mars Express
* MESSENGER
* Nozomi
* Pioneer 7
* 10
* 11
* Pioneer Venus Orbiter
* Sakigake
* Venus Express
* Venera 9
* Voyager 1
* 2

Radiometer|

| Microwave|

| Near Earth|

* AQUA
* AMR-C (Sentinel-6)
* AMSR-E (AQUA)
* AMSR (ADEOS II)
* AMSR2 (Shizuku)
* DMSP 5D-2/F13-F15
* DMSP 5D-2/F16
* ERSS
* Envisat
* GPM Core
* Kanopus-ST
* MIRAS
* MISR, MOPITT (Terra)
* MSR (MOS-1, MOS-1b)
* MTVZA (Meteor-3M-1)
* MTVZA-GYa
* Meteor-M2
* Meteor-M2-1
* Nimbus 7
* RM-08 and MTVZA-OK (Sich-1M)
* Seasat
* Sentinel-3
* SMAP
* SMMR
* SMOS
* SSM/I
* SSMIS
* TRMM
* WSF-M
* Zond-PP

|

Interplanetary|

* Cassini-Huygens
* Electra (radio)
* Mariner 2
* MWR (Juno)
* Rosetta

Infrared-Visible|

| Near Earth|

* AVHRR
* ASTER, MISR (Terra)
* AIRS
* AVNIR
* AVNIR-2
* CERES (TRMM, Terra, Aura, Suomi NPP, NOAA-20)
* ERBS
* ERSS
* GLI (ADEOS II)
* Kanopus-V-IK
* MESSR and VTIR
* MOS-1
* 1b
* Meteor-2
* MODIS (Terra, Aqua)
* OPS (JERS-1)
* ORI (EURECA)
* Radiation Budget Instrument
* SGLI (GCOM-C)
* SLSTR (Sentinel-3)
* VIIRS (Suomi NPP, JPSS-2)

|

Interplanetary|

* COMARS+ (on Schiaparelli)
* Diviner (on LRO)
* HP3 (on InSight)

* IRIS
* Luna 13
* Mariner 6 and 7
* Mariner 10
* Mars 96
* 2M No.521
* 2M No.522
* Pioneer 10
* 11
* PMIRR (on Mars Climate Orbiter)
* Venera 9
* 10
* Voyager 1
* 2

Ultraviolet (UV)|

| Near Earth|

* ORI (EURECA)
* LYRA
* Proba-2

|

Spectrophotometers|

| Long wavelength|

| Interplanetary|

* ISO

|

Visible-IR (VIRS)|

| Near Earth|

* CASE
* MOMS
* Multispectral Scanner
* SCIAMACHY
* TES
* TRMM

|

Interplanetary|

* AKARI
* Envisat
* Rosalind Franklin rover
* MA-MISS
* ISEM
* Infrared Space Observatory
* IRIS (Voyager 1 and 2)
* JIRAM (on Juno)
* M3
* Mariner 6 and 7
* MASCS
* MERIS
* E-THEMIS, MISE, SUDA (on Europa Clipper)
* Ralph
* SPICAM
* SPICAV

UV-visible (UVVS)|

| Interplanetary|

* Alice
* Mariner 6 and 7
* Mariner 10
* MASCS
* NOMAD
* SPICAM
* SPICAV
* UVS
* Voyager 1
* 2

|

Raman|

| Interplanetary|

* Raman Laser Spectrometer (Rosalind Franklin rover)
* SHERLOC (Mars 2020 rover)

|

Magnetometer|

| Near Earth|

* GOES
* QuakeSat 1 and 2
* SGVM
* Proba-2

|

Interplanetary|

* FIELDS
* Pioneer 10
* 11
* Voyager 1
* 2
* MAG (Juno)
* ICEMAG and PIMS (Europa Clipper)

Triaxial fluxgate|

| Interplanetary|

* Cassini–Huygens
* FIELDS
* Magsat
* Mariner 2
* 4
* 5
* 10
* MESSENGER
* Pioneer 11
* Venus Express

|

Helium vapor|

| Interplanetary|

* Cassini–Huygens

|

Particle
detectors|

| Ion detectors|

| Near Earth|

* DEMETER
* TPMU and DSLP
* Proba-2

|

Interplanetary|

* ASPERA-3
* ASPERA-4
* Mariner 2
* SPS
* Ulysses

Neutral particle detector|

| Interplanetary|

* ADRON-RM (Rosalind Franklin rover)
* ASPERA-3 (on Mars Express)
* ASPERA-4 (on Venus Express)
* DAN (on Curiosity)
* FREND (on ExoMars TGO)
* Nozomi
* SPS (on Mariner 2)
* Ulysses

|

Mass spectrometer|

| Interplanetary|

* MASPEX (Europa Clipper)
* MOMA (Rosalind Franklin rover)

|

Seismometers|

* SEIS (on InSight)
* Viking 1
* 2

Imagers/telescopes|

* High Resolution Stereo Camera
* HiRISE
* LORRI
* Mars Orbiter Camera

Microscopes|

* MicrOmega-IR (Rosalind Franklin rover)

Astronomical
instruments|

* International Lunar Observatory
* MoonLIGHT

Misc|

* Deep Space Atomic Clock
* Inertial Stellar Compass
* Venetia Burney Student Dust Counter
* Plasma Wave Subsystem

## External links

* Home site of LaRa at the Royal Observatory of Belgium.
* Twitter account of LaRa.

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