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In-Situ Investigation of the Aseroid (162173) Ryugu by the Hayabusa2 MASCOT Lander

Grott, Matthias and Jaumann, R and Bibring, J-.P. and Ho, Tra-Mi and Hercik, D. and Auster, H-U. and Biele, Jens and Lorda, Laurence and Moussi, Aurelie and Hamm, Maximilian and Knollenberg, Jörg and Schmitz, Nicole and Schröder, Stefan and Otto, Katharina A. and Krause, Christian and Pilorget, C. and Hamm, Vincent and Yano, Hajime and Okada, T. and Sakatani, N. and Reill, Josef and Sasaki, Kaname and Schlotterer, Markus and Tsuda, Yuichi and Ulamec, Stephan and Wolff, Friederike and Michel, Patrick and Delbo, Marco and Ogawa, Kazunori and Senshu, H. and Preusker, Frank and Scholten, Frank and Elgner, Stephan and Mottola, Stefano and Kührt, Ekkehard and Saiki, Takanao and Mimasu, Yuya (2019) In-Situ Investigation of the Aseroid (162173) Ryugu by the Hayabusa2 MASCOT Lander. AGU General Assembly, 9.-13.12.2019, San Francisco.

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Official URL: https://agu.confex.com/agu/fm19/meetingapp.cgi/Paper/488948


JAXA’s Hayabusa2 mission was launched in December 2014 to explore the pristine C-type asteroid (162173) Ryugu, whose bulk material can be considered representative for the volatile rich building blocks that formed the terrestrial planets. C-types are the most common variety of asteroids, and 75% of all known asteroids are of this type. They mainly occur at the outer edge of the asteroid belt, where 80% of asteroids are C-type, but chondritic meteorites are rare in our sample collections, which makes (162173) Ryugu a special target. Hayabusa2 reached Ryugu after a 3.5 years cruise on June 27th, 2018, and after initial characterization and landing site selection, the Hayabusa2 spacecraft delivered the DLR/CNES built MASCOT lander to the asteroid’s surface on October3rd, 2018, where MASCOT successfully performed in situ investigations. The MASCOT payload consisted of a wide angle camera (MasCAM), an imaging IR spectrometer (MicrOmega), a multichannel radiometer (MARA), and a magnetometer (MasMAG), gathering a wealth of data during the 17h and 7min surface operations. The asteroid’s surface was characterized down to the millimeter scale, and MasCAM images revealed a surface dominated by rocks and boulders without showing fine-grained material. Most boulders appear dark with cauliflower-like crumbly surfaces, and inclusions observed in high-resolution images have strong similarities with carbonaceous chondrites. Diurnal temperature variations of a ~60 cm diameter rock were found to be consistent with low thermal inertia around 300 J m-2 K-1 s-1/2, much lower than anticipated when compared to samples in our meteorite collections. This indicates that rocks on Ryugu are highly porous and likely very friable. The remnant magnetization of Ryugu's surface material on scales larger than 1 m has an upper limit of 3·10-6 Am2/kg, and a preliminary analysis of the induction effect in Ryugu caused by the variation in the solar wind magnetic field reveals high electrical conductivity of the order of 1 S m-1. In summary, MASCOT measurements indicate that C-type asteroids appear similar to carbonaceous chondrites, and that magnetization did not play a major role during the accretion of the terrestrial planets.

Item URL in elib:https://elib.dlr.de/132734/
Document Type:Conference or Workshop Item (Speech)
Title:In-Situ Investigation of the Aseroid (162173) Ryugu by the Hayabusa2 MASCOT Lander
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Grott, MatthiasMatthias.Grott (at) dlr.deUNSPECIFIED
Jaumann, Rralf.jaumann (at) dlr.deUNSPECIFIED
Ho, Tra-MiTra-Mi.Ho (at) dlr.deUNSPECIFIED
Hercik, D.Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstrasse 3, D-38106 Braunschweig, GermanyUNSPECIFIED
Auster, H-U.TU Braunschweig, GermanyUNSPECIFIED
Biele, JensJens.Biele (at) dlr.deUNSPECIFIED
Lorda, LaurenceCNES, ToulouseUNSPECIFIED
Moussi, Aureliecnes toulouseUNSPECIFIED
Hamm, Maximilianmaximilian.hamm (at) dlr.deUNSPECIFIED
Knollenberg, JörgJoerg.Knollenberg (at) dlr.deUNSPECIFIED
Schmitz, NicoleNicole.Schmitz (at) dlr.deUNSPECIFIED
Schröder, StefanStefanus.Schroeder (at) dlr.dehttps://orcid.org/0000-0003-0323-8324
Otto, Katharina A.Katharina.Otto (at) dlr.dehttps://orcid.org/0000-0002-0675-1177
Krause, ChristianChristian.Krause (at) dlr.deUNSPECIFIED
Pilorget, C.Institut d'Astrophysique Spatiale (IAS), CNRS/Université Paris Sud, Orsay, FranceUNSPECIFIED
Hamm, Vincentvincent.hamm (at) ias.u-psud.frUNSPECIFIED
Okada, T.Institute of Space and Astronautical Science , Japan Aerospace Exploration Agency (ISAS / JAXA) ( 3 - 1 - 1 Yoshinodai, Chuo - Ku, Sa gamihara 2 52 - 5210 , JapanUNSPECIFIED
Reill, JosefJosef.Reill (at) dlr.dehttps://orcid.org/0000-0003-4092-063X
Sasaki, KanameKaname.Sasaki (at) dlr.deUNSPECIFIED
Schlotterer, MarkusMarkus.Schlotterer (at) dlr.dehttps://orcid.org/0000-0002-6565-3622
Tsuda, Yuichiisas/jaxa, japanUNSPECIFIED
Ulamec, StephanStephan.Ulamec (at) dlr.deUNSPECIFIED
Wolff, FriederikeFriederike.Wolff (at) dlr.deUNSPECIFIED
Michel, PatrickUNS-CNRS, FranceUNSPECIFIED
Delbo, MarcoOsservatorio Astronomico di Torino, Pino Torinese, ItalienUNSPECIFIED
Ogawa, KazunoriDep. of Planetology, Kobe University, Kobe - JapanUNSPECIFIED
Senshu, H.Chiba Institute of Technology, JapanUNSPECIFIED
Preusker, Frankfrank.preusker (at) dlr.deUNSPECIFIED
Scholten, FrankFrank.Scholten (at) dlr.deUNSPECIFIED
Elgner, StephanStephan.Elgner (at) dlr.deUNSPECIFIED
Mottola, StefanoStefano.Mottola (at) dlr.deUNSPECIFIED
Kührt, EkkehardEkkehard.Kuehrt (at) dlr.deUNSPECIFIED
Saiki, Takanaoisas/jaxa japanUNSPECIFIED
Mimasu, YuyaJapan Aerospace Exploration Agency (JAXA), Sagamihara, JapanUNSPECIFIED
Date:December 2019
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Asteroids Ryugu MASCOT MARA Regolith
Event Title:AGU General Assembly
Event Location:San Francisco
Event Type:international Conference
Event Dates:9.-13.12.2019
Organizer:American Geophysical Union
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):Project MASCOT Science and operation (old)
Location: Berlin-Adlershof , Bremen , Köln-Porz , Oberpfaffenhofen
Institutes and Institutions:Institute of Planetary Research > Planetary Physics
Institute of Planetary Research > Asteroids and Comets
Space Operations and Astronaut Training > User center for space experiments (MUSC)
Institute of Space Systems > Navigation and Control Systems
Institute of Space Systems > Systems Engineering and Project Office
Institute of Robotics and Mechatronics (since 2013) > Mechatronic Systems
Institute of Planetary Research > Planetary Geology
Deposited By: Grott, Dr.rer.nat. Matthias
Deposited On:13 Dec 2019 10:14
Last Modified:13 Dec 2019 10:14

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