Tatsuaki Hashimoto
A5003437047- Astro and Planetary Science
- Planetary Science and Exploration
- Space Satellite Systems and Control
- Inertial Sensor and Navigation
- Spacecraft Design and Technology
- Spacecraft Dynamics and Control
- Spacecraft and Cryogenic Technologies
- Aerospace Engineering and Energy Systems
- Dynamics and Control of Mechanical Systems
- Spaceflight effects on biology
- Magnetic Bearings and Levitation Dynamics
- Space Exploration and Technology
- Rocket and propulsion systems research
- Pulsars and Gravitational Waves Research
- Radio Astronomy Observations and Technology
- Geophysics and Gravity Measurements
- Space Science and Extraterrestrial Life
- Mechanical Engineering and Vibrations Research
- Vibration Control and Rheological Fluids
- Robotic Path Planning Algorithms
- Robotics and Sensor-Based Localization
- Vehicle Dynamics and Control Systems
- Gamma-ray bursts and supernovae
- Soil Mechanics and Vehicle Dynamics
- Geology and Paleoclimatology Research
Japan Aerospace Exploration Agency
2013-2023
The University of Tokyo
1989-2022
Tokyo University of Information Sciences
2021-2022
Institute of Space and Astronautical Science
2009-2021
Tohoku University
2006-2016
Osaka Prefecture University College of Technology
2013
International Society of Automation
2006-2013
Nagoya University
2011
Mitsubishi Electric (Japan)
2006-2008
Toshiba (Japan)
2006-2007
The objectives of the DECi-hertz Interferometer Gravitational Wave Observatory (DECIGO) are to open a new window observation for gravitational wave astronomy and obtain insight into significant areas science, such as verifying characterizing inflation, determining thermal history universe, dark energy, describing formation mechanism supermassive black holes in center galaxies, testing alternative theories gravity, seeking hole matter, understanding physics neutron stars searching planets...
DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the future Japanese space gravitational antenna. It aims at detecting various kinds of waves between 1 mHz and 100 Hz frequently enough to open a new window observation for astronomy. The pre-conceptual design DECIGO consists three drag-free satellites, 1000 km apart from each other, whose relative displacements are measured by Fabry–Perot Michelson interferometer. We plan launch in 2024 after long intense development...
After global observations of asteroid 25143 Itokawa by the Hayabusa spacecraft, we selected smooth terrain Muses Sea for two touchdowns carried out on 19 and 25 November 2005 UTC first sample collection with an impact sampling mechanism. Here, report initial findings about geological features, surface condition, regolith grain size, compositional variation, constraints physical properties this site using both scientific housekeeping data during descent sequence touchdown. Close-up images...
DECIGO (DECi-hertz Interferometer Gravitational wave Observatory) is the planned Japanese space gravitational antenna, aiming to detect waves from astrophysically and cosmologically significant sources mainly between 0.1 Hz 10 thus open a new window for astronomy universe. will consists of three drag-free spacecraft arranged in an equilateral triangle with 1000 km arm lengths whose relative displacements are measured by differential Fabry-Perot interferometer, four units triangular...
Rendezvous of the Japanese spacecraft Hayabusa with near-Earth asteroid 25143 Itokawa took place during interval September through November 2005. The onboard camera imaged solid surface this tiny (535 meters by 294 209 meters) a spatial resolution 70 centimeters per pixel, revealing diverse morphologies. Unlike previously explored asteroids, reveals both rough and smooth terrains. Craters generally show unclear Numerous boulders on Itokawa's suggest rubble-pile structure.
The ranging instrument aboard the Hayabusa spacecraft measured surface topography of asteroid 25143 Itokawa and its mass. A typical rough area is similar in roughness to debris located on interior wall a large crater 433 Eros, which suggests structure ejecta Eros. mass was estimated as (3.58 +/- 0.18) x 10(10) kilograms, implying bulk density (1.95 0.14) grams per cubic centimeter for volume (1.84 0.09) 10(7) meters porosity approximately 40%, that angular sands, when assuming an LL (low...
DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the future Japanese space gravitational antenna. DECIGO expected to open a new window of observation for astronomy especially between 0.1 Hz and 10 Hz, revealing various mysteries universe such as dark energy, formation mechanism supermassive black holes, inflation universe. The pre-conceptual design consists three drag-free spacecraft, whose relative displacements are measured by differential Fabry-Perot Michelson...
DECi-hertz Interferometer Gravitational-wave Observatory (DECIGO) is a future Japanese space gravitational-wave antenna. The most important objective of DECIGO, among various sciences to be aimed at, detect gravitational waves coming from the inflation universe. DECIGO consists four clusters spacecraft, and each cluster three spacecraft with Fabry–Perot Michelson interferometers. As pathfinder mission B-DECIGO will launched, hopefully in 2020s, demonstrate technologies necessary for as well...
The locations of the pole and rotation axis asteroid 25143 Itokawa were derived from Asteroid Multiband Imaging Camera data on Hayabusa spacecraft. retrograde orientation had a right ascension 90.53 degrees declination -66.30 (52000 equinox) or equivalently 128.5 -89.66 in ecliptic coordinates with 3.9 margin error. surface area is 0.393 square kilometers, volume 0.018378 cubic kilometers 5% error, three lengths are 535 meters by 294 209 meters. global revealed boomerang-shaped appearance...
EQUULEUS (EQUilibriUm Lunar-Earth point 6U Spacecraft) will be the world's smallest spacecraft to explore Earth-Moon Lagrange point. It is being jointly developed by JAXA (Japan Aerospace Exploration Agency) and University of Tokyo, launched NASA's Space Launch System Mission-1. The fly a libration orbit around L2 (EML2) demonstrate low-energy trajectory-control techniques within Sun-Earth-Moon region for first time nano-class spacecraft. also carries three scientific observation missions:...
An autonomous rendezvous guidance scheme for spacecraft to descend small celestial bodies by using optical information is presented. First, a new guidance, navigation, and control (GNC) method based on fixation-point (FP) inheritance proposed. A can safely toward the target point body tracking autonomously renewing FPs surface. Next, we deal with of extracting FPs. spatial band-pass filter (BPF) applied pictures taken enhance features having comparable size window. Local variance filtered...
DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the future Japanese space gravitational antenna. The goal of DECIGO to detect waves from various kinds sources mainly between 0.1 Hz and 10 thus open a new window observation for astronomy. will consist three drag-free spacecraft, 1000 km apart each other, whose relative displacements are measured by Fabry—Perot Michelson interferometer. We plan launch pathfinder first demonstrate technologies required realize and, if...
This article presents a comprehensive path-planning method for lunar and planetary exploration rovers. In this method, two new elements are introduced as evaluation indices path planning: 1) determined by the rover design 2) derived from target environment. These defined rover's internal external elements, respectively. article, locomotion mechanism insolation (i.e., shadow) conditions were considered to be that ensure safety energy, influences of these on planning described. To examine...
The dynamical environment about and on Asteroid 25143 Itokawa is studied using the shape rotation state model estimated during close proximity phase of Hayabusa mission to that asteroid. We first discuss general gravitational properties assuming a constant density. Next we actual this body, both surface in orbit, consider orbital dynamics Hayabusa-like spacecraft. Then detail one approaches used estimate mass optical lidar imaging, phase.
Abstract— We obtained color images of near‐Earth asteroid 25143 Itokawa by the Hayabusa multiband imaging camera to characterize regional properties. Images were for whole disk from gate position (GP) and home (HP) at a spatial resolution 0.8–3.7 m/pixel. Whole‐disk spectra are adjusted telescopic data University Hawai'i's 88‐inch telescope using Eight Color Asteroid Survey (ECAS) system. The disk‐resolved measurements show large variations in three visible channels. present map an index...
A space gravitational-wave antenna, DECIGO (DECI-hertz interferometer Gravitational wave Observatory), will provide fruitful insights into the universe, particularly on formation mechanism of supermassive black holes, dark energy and inflation universe. In current pre-conceptual design, be comprising four units; each unit formed by three drag-free spacecraft with 1000 km separation. Since an extremely challenging mission high-precision flight long baseline, it is important to increase...
When a spacecraft lands, large shock load can lead to undesirable responses such as rebound and tripping. The authors previously discussed the problem of controlling these using momentum exchange impact dampers. An active/passive hybrid damper, which included an active actuator, was proposed. dampers' performances are evaluated by maximum height, is proportional mechanical energy spacecraft. However, time energies have not been explained. In addition, effectiveness dampers only in...
DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the planned Japanese space gravitational antenna, aiming to detect waves from astrophysically and cosmologically significant sources mainly between 0.1 Hz 10 thus open a new window for astronomy universe. DECIGO will consist of three drag-free spacecraft, 1000 km apart each other, whose relative displacements are measured by differential Fabry-Perot interferometer. We plan launch in middle 2020s, after sequence two...
Abstract The subkilometer-size asteroid 25143 Itokawa is considered to have a gravitationally bounded rubble-pile structure. Boulders appearing in high-resolution images retrieved by the Hayabusa mission revealed genuine outcome of collisional event involving asteroid’s parent body. Here we report that boulders’ shapes and structures are strikingly similar laboratory rock impact fragments despite differences orders magnitude scale complexities physical processes. These similarities suggest...