MASCOT
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| MASCOT | |
|---|---|
| Name | MASCOT |
| Operator | CNES / DLR / JAXA |
| Mission type | Lander |
| Launch date | 2014-11-30 |
| Launch vehicle | H-IIA 202 |
| Launch site | Tanegashima Space Center |
| Manufacturer | CNES / DLR |
| Mass | 10.5 kg |
| Power | lithium battery |
| Dimensions | 29 × 27 × 19 cm |
MASCOT MASCOT was a small autonomous asteroid lander deployed on the Hayabusa2 mission to the near-Earth asteroid 162173 Ryugu. Developed through international cooperation among CNES, DLR, and JAXA, it carried instruments to characterize surface composition, thermal properties, and morphology. The mission complemented orbital and sample-return activities by providing in situ measurements that informed analysis by teams at ISAS, JPL, and laboratories across France, Germany, and Japan.
Overview
MASCOT was conceived during collaborations between CNES, DLR, and JAXA following heritage from landers such as Philae and missions including Hayabusa. It rode to Ryugu aboard Hayabusa2 alongside the Japanese rovers MINERVA-II1A and MINERVA-II1B and the international sampler Sampler-Model-1. The lander’s design integrated lessons from Rosetta, SMART-1, and NEAR Shoemaker operations, aiming to extend scientific return beyond remote sensing by teams at University of Tokyo, Tohoku University, Max Planck Institute for Solar System Research, and Institut d'Astrophysique Spatiale.
Design and Development
Engineers from DLR and CNES led development in collaboration with contractors such as OHB SE and institutes including ISAS. The 10.5 kg box contained a hopping mechanism developed from work on Philae actuator concepts and tested at facilities like ESTEC and JAXA Tsukuba Space Center. Thermal, mechanical, and electronics subsystems were validated with support from ESA programs and standards derived from Arianespace and Mitsubishi Heavy Industries launch heritage. Project management involved teams at CNES Toulouse, DLR Bremen, University of Cologne, and AIST.
Flight and Mission Operations
Launched on H-IIA 202 from Tanegashima Space Center on 30 November 2014, Hayabusa2 performed gravity assists at Earth and deep-space maneuvers guided by navigation teams at ISAS and support from JPL and ESOC. MASCOT was released in October 2018 during proximity operations managed by operators at JAXA and flight controllers communicating with ground stations including Usuda Deep Space Center, ESA Deep Space Antenna, and New Norcia. The lander performed autonomous sequencing influenced by mission profiles from Mars Pathfinder and command philosophies used on Voyager and Cassini–Huygens missions. Operations required coordination with science leads at Planetary Society partners and sampling teams at Kyoto University.
Scientific Instruments and Objectives
MASCOT carried four primary instruments: a visible and near-infrared spectrometer developed with DLR Institute of Planetary Research, a radiometer built by CNES teams in partnership with LAM and Institut d'Astrophysique Spatiale, a magnetometer from IPGP, and a microscopic camera supplied by DLR and CNES laboratories. Objectives included compositional mapping akin to techniques used by Mars Reconnaissance Orbiter and Dawn, thermal inertia studies used previously by Lunar Reconnaissance Orbiter, magnetic field searches like those on MESSENGER, and high-resolution imaging comparable to observations from NEAR Shoemaker and Hayabusa landers. Instrument development incorporated calibration methods from ISO, Spitzer Space Telescope, and terrestrial facilities such as Synchrotron Radiation Facility beamlines at ESRF.
Results and Discoveries
MASCOT executed up to four surface operations, acquiring data that constrained mineralogy, porosity, and thermal conductivity of Ryugu’s regolith. Spectrometer results complemented analyses from Hayabusa2’s Optical Navigation Camera and Near Infrared Spectrometer, while radiometry informed modeling efforts at Max Planck Institute for Solar System Research and NASA Goddard Space Flight Center. Findings supported hypotheses about carbonaceous chondrite analogs similar to meteorites studied at Smithsonian Institution and Natural History Museum, London collections, and contributed to isotopic and petrologic interpretations pursued at University of Tokyo and Tohoku University laboratories. Data sparked comparisons with samples from OSIRIS-REx target Bennu studied by University of Arizona teams, and influenced theoretical work at Caltech and MIT on early Solar System processes and delivery of volatiles discussed at meetings such as the American Geophysical Union and European Planetary Science Congress.
Cultural and Educational Impact
MASCOT’s outreach engaged institutions including CNES, DLR, JAXA, UNESCO-supported programs, and museums like the French National Museum of Natural History and Deutsches Museum. Educational modules inspired classroom activities at University of California, Berkeley, Imperial College London, and University of Cambridge, and featured in exhibits at Science Museum, London and Cité des Sciences et de l'Industrie. Public engagement campaigns collaborated with media outlets such as NHK, France Télévisions, Deutsche Welle, and science communicators affiliated with The Planetary Society and Royal Astronomical Society, promoting careers at institutions like ETH Zurich and University of Bonn.