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Thermal Inertia Determination of C-type Asteroid Ryugu from in-situ Surface Brightness Temperature Measurements

Hamm, Maximilian und Grott, M. und Knollenberg, J. und Kührt, E. und Pelivan, Ivanka (2016) Thermal Inertia Determination of C-type Asteroid Ryugu from in-situ Surface Brightness Temperature Measurements. American Astronomical Society, DPS meeting #48, 2016-10-16 - 2016-10-21, USA.

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Kurzfassung

The Japanese Hayabusa-2 mission is a sample-return mission currently on its way to the C-type asteroid Ryugu. Hayabusa-2 carries the small lander MASCOT (Mobile Asteroid Surface Scout), whose scientific payload includes the infrared radiometer MARA. The primary science goal of MARA is to determine Ryugu's surface brightness temperatures at the landing site for a full asteroid rotation, which will be measured using a long-pass filter, an 8 to 12 µm bandpass, as well as four narrow bandpasses centered at wavelengths between 5 and 15 µm. From these measurements, surface thermal inertia will be derived, but because MARA performs single pixel measurements, heterogeneity in the field of view cannot be resolved. Yet, the surface will likely exhibit different surface textures, and thermal inertia in the field of view could vary from 600 (small rocks) to 50 Jm-2s-0.5K-1 (fine regolith grains). Sub-pixel heterogeneity is a common problem when interpreting radiometer data, since the associated ambiguities cannot be resolved without additional information on surface texture. For MARA, this information will be provided by the MASCOT camera, and in the present paper we have investigated to what extent different thermal inertias can be retrieved from MARA data. To test the applied approach, we generated synthetic MARA data using a thermal model of Ryugu, assuming different thermal inertias for sections of the field of view. We find that sub-pixel heterogeneity systematically deforms the diurnal temperature curve so that it is not possible to fit the data using a single thermal inertia value. However, including the area fractions of the different surface sections enables us to reconstruct the different thermal inertias to within 10% assuming appropriate measurement noise. The presented approach will increase robustness of the Ryugu thermal inertia determination and results will serve as a ground truth for the global measurements performed by the thermal infrared mapper (TIR) on the Hayabusa-2 main spacecraft.

elib-URL des Eintrags:https://elib.dlr.de/108574/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Thermal Inertia Determination of C-type Asteroid Ryugu from in-situ Surface Brightness Temperature Measurements
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Hamm, Maximilianmaximilian.hamm (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Grott, M.matthias.grott (at) dlr.dehttps://orcid.org/0000-0002-8613-7096NICHT SPEZIFIZIERT
Knollenberg, J.joerg.knollenberg (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Kührt, E.ekkehard.kuehrt (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Pelivan, Ivankaivanka.pelivan (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2016
Referierte Publikation:Nein
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Hayabusa; MASCOT; MARA;
Veranstaltungstitel:American Astronomical Society, DPS meeting #48
Veranstaltungsort:USA
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:16 Oktober 2016
Veranstaltungsende:21 Oktober 2016
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erforschung des Weltraums
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):R - Projekt MASCOT (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Asteroiden und Kometen
Hinterlegt von: Schubert, Renate
Hinterlegt am:30 Nov 2016 08:05
Letzte Änderung:18 Jun 2024 14:43

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