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• Mission: Launch 2014/15; Deployment June-August 2019, release alt. 100m
• Mission duration: 16 hrs of on-asteroid operation• Main functions:
• On-surface up-righting and mobility (incl. attitude determination) by internal torquer
• Mainly autonomous science measurements and operation without ground interference
• Payload: 4 instruments with 3 kg total mass including margins• Configuration: Prismatic body with fixed instrument accommodation• Structure: no boxes, but integrated structure (including common
electronics accommodation)
Design status of the Mobile Asteroid Surface Scout (MASCOT) for the Hayabusa-2 mission
J. Biele, S. Ulamec, Caroline Lange, Christian Krause, Tra-Mi Ho, Susanne Wagenbach, Lars Witte, Eugen Ksenik, Tim van Zoest and the MASCOT-Study Team
MASCOT was proposed to fill the gap between remote investigations by the main-S/C and investigation of returned samplesRemote:
• GLOBAL study of the target body• Link to telescopic data• Sampling site selection
Returned Samples:• MICROSCOPIC study of the target body• Link to meteorite/cosmic dust collection data• Can use the most updated analytical
facilities at returnMASCOT:
• LOCAL study of the target body • Cross-scale link between mother-S/C data
and sample analyses• Sampling site investigation in-situ, analytical
capabilities• Direct exploration of sub-surface information
(1) Background
(2) Science Objectives
(1) MASCOT = “Mobile Asteroid Surface Scout“, strong heritage from PHILAE (Rosetta Lander, launched 2004)
(2) Mobility by „hopping“ in µ-gravity
(3) Several proposals for asteroid missions (ESA’s Marco Polo, Marco Polo R, JAXA’s Hayabusa-2 identified interest in a dedicated lander for in-situ science DLR Bremen proposed MASCOT as a dedicated lander
(4) JAXA/ISAS: to launch Hayabusa-2 in 2014/15 primary flight opportunity
(5) MASCOT now in Phase B, breadboards being built
(6) Adaptable to other missions to small bodies
(4) System Requirements and Baseline Design
Contact
(3) Payload (for MASCOT on H-2)
(3) Target Body
1999 JU3• C-type asteroid is likely to be a rubble-pile • size of 1999 JU3 comparable to ITOKAWA
µOmega
MAG
CAMMARA
• Wide Angle Camera to CAM (0.4 kg) obtain multispectral images of the landing site and provide geological context for MASCOT PL
• MicrOmega to imaging spectrometer (1,9 kg) to determine mineralogical composition and characterize grains size and structure of surface soil samples at μ-scale
• Mid-IR thermal sensor Mara (0.12 kg) to map NEA‘s surface temperature to determine the thermal inertia Yarkovsky, YORP
• 3-axis fluxgate Magnetometer MAG (0.15 kg) to determine magnetization of the NEA formation history
Jan. 2019apohelion
June 2018 / Sep. 2019perihelion
HAYABUSA-2 arrival
Aug. 2019equinox
impact of penetrator (TBD)
Nov. 2018equinox
Aug. 2018 / Dec. 2019 HAYABUSA-2
departure
Feb. 2019global characterization completed
1999 JU3 orbit
July 2018 / Nov. 2019north pole iluminated
April 2019south pole iluminated
9090
HAYABUSA-2 sampling dress rehearsals,
MASCOT deployment
• Highly integrated approach for all subsystems, passive and low risk system
• Thermal: mainly passive (i.e. using coatings and MLI) with heating only during cruise and for warm-up
• Communication: UHF-band using synergies with the main-S/C
• Power: Primary battery only, 210 Wh (LiSOCl2)
• Redundancy for onboard computer
• High degree of autonomy• Long-lived version about
same mass
Fig.: Hayabusa-2 and MASCOT Mission Timeline
Fig.: MASCOT On-Surface Operations
SDL-Phase On-Surface Operation
Home Position20 km
Deployment Altitude100 m
altitude
Relocation
1 asteroid day
Up-Righting
1st Science Cycle 2nd Science CycleD ND N DN DN
D Daytime Measurements
N Nighttime Measurements
Tab. 1: Mass Budget
Fig.: 1999 JU3 shape model and gravitational model
Fig.: Views of ITOKAWA (left) and size comparision (bottom)
Fig.: Artists rendition of Marco Polo (left) and Hayabusa at ITOKAWA (middle and right)
[JA
XA
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Abe, M., Kawakami, K., Hasegawa, S. et al. 2008, COSPAR Scientific Assembly, B04-0061-08.Kawakami, K. 2009, Master's thesis, University of Tokyo
Jens Biele German Aerospace Center / DLR RB-MUSC Linder Höhe 1, 51147 Köln / GERMANY
Telefone: +49-2203-601-4563; E-Mail: [email protected]
International Primitive Body Exploration Working Group 2011 Workshop
Fig.: MASCOT after eject from H-2 (MESS interface)
Figs.: MASCOT Design
