Asteroid
25143 Itokawa
A near-Earth asteroid sampled by Japan's Hayabusa.
- Type
- Asteroid
- Domain
- Scientific connections
- Connections
- 9
ISAS, JAXA · CC BY
- Type: Asteroid
- Domain: Scientific connections
Orbit & physical parameters
Osculating orbit and physical parameters from the NASA JPL Small-Body Database · Apollo · near-Earth · potentially hazardous · epoch 2026-06-09 (JD 2461200.5 TDB) · Earth MOID 0.0130471 au
| Semi-major axis | 1.324052 ± 4.1248e-9 au | NASA JPL · calculated |
| Eccentricity | 0.280178 ± 2.0795e-9 | NASA JPL · calculated |
| Perihelion distance | 0.953082 ± 1.5401e-9 au | NASA JPL · calculated |
| Aphelion distance | 1.695022 ± 5.2805e-9 au | NASA JPL · calculated |
| Inclination | 1.620941 ± 2.6923e-7 deg | NASA JPL · calculated |
| Longitude of ascending node | 69.074497 ± 6.1561e-6 deg | NASA JPL · calculated |
| Argument of perihelion | 162.840902 ± 6.1449e-6 deg | NASA JPL · calculated |
| Orbital period | 556.488417 ± 2.6004e-6 d | NASA JPL · calculated |
| Diameter | 0.33 km | NASA JPL · catalogued |
| Rotation period | 12.132 h | NASA JPL · catalogued |
| Absolute magnitude (H) | 19.26 mag | NASA JPL · catalogued |
Full field-level provenance
- Semi-major axis: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · a · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Giorgini, 1025 obs · retrieved 2026-07-11
- Eccentricity: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · e · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Giorgini, 1025 obs · retrieved 2026-07-11
- Perihelion distance: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · q · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Giorgini, 1025 obs · retrieved 2026-07-11
- Aphelion distance: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · ad · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Giorgini, 1025 obs · retrieved 2026-07-11
- Inclination: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · i · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Giorgini, 1025 obs · retrieved 2026-07-11
- Longitude of ascending node: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · om · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Giorgini, 1025 obs · retrieved 2026-07-11
- Argument of perihelion: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · w · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Giorgini, 1025 obs · retrieved 2026-07-11
- Orbital period: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · orbit.elements · per · JPL orbit determination (least-squares fit to the observation arc) · calculated · JPL solution by Giorgini, 1025 obs · retrieved 2026-07-11
- Diameter: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · phys_par · phys.diameter · catalogued value · JPL solution by Giorgini, 1025 obs · retrieved 2026-07-11
- Rotation period: Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · phys_par · phys.rot_per · catalogued value · JPL solution by Giorgini, 1025 obs · retrieved 2026-07-11
- Absolute magnitude (H): Jet Propulsion Laboratory / Solar System Dynamics · JPL SBDB · phys_par · phys.H · catalogued value · JPL solution by Giorgini, 1025 obs · retrieved 2026-07-11
Orbital elements are a calculated JPL orbit-determination fit, all referred to the single osculating epoch above (solution by Giorgini); each carries its own uncertainty. Fields the database did not provide are omitted, never invented.
Experience system V6
Small-body profile
A catalog-first story for orbit class, discovery, physical parameters, and planetary-defense context when recorded.
- 01
Observe
WIKIMEDIA imagery anchors the visual reading with licensed source metadata.
- 02
Measure
Measurement panels use graph coverage, catalog identifiers, and source availability without inventing values.
- 03
Locate
Part of Solar System.
- 04
Connect
9 graph relations shape the knowledge viewport.
- Object type
- Asteroid
- Graph relations
- 9
- Verified sources
- 1
- Image records
- 1
- Domain
- Scientific connections
- Status
- Graph entity
Scientific map
Orbit context
- Primary orbital anchor
- The Sun
- Measured orbit field
- Orbital distance not recorded in this graph record
Original SVG diagram
Small-body anatomy
- Designation
- (25143) Itokawa
- Discovery
- 1998
- Eccentricity
- Not recorded
- Inclination
- Not recorded
Visual knowledge graph
Relationships, not isolated facts
This viewport is generated from the Asteria knowledge graph. Science, culture, and interpretive links remain separated by domain so visual context never changes the evidentiary meaning of a relation.
- Member of groupApollo asteroids
- Associated withFirst Asteroid Sample Return
- Target ofHayabusa
- Visited byHayabusa
- Samples returned byHayabusa
- Landing site ofHayabusa
- Associated withHayabusa Samples Asteroid Itokawa
- Associated withItokawa Sample (Hayabusa)
Image provenance
Photography as evidence
Continue the atlas
Curated next objects
Solar System
The Sun and the bodies gravitationally bound to it.
space missionHayabusa
Hayabusa was the first mission to return a sample from an asteroid, the near-Earth asteroid Itokawa.
near earth objectApollo asteroids
The largest class of near-Earth asteroids — Earth-crossers with orbits mostly larger than Earth's, named after 1862 Apollo.
returned sampleItokawa Sample (Hayabusa)
More than 1,500 microscopic grains from the S-type asteroid 25143 Itokawa, returned by Hayabusa in 2010 — the first sample ever returned from an asteroid. The grains tied ordinary (LL) chondrite meteorites to S-type asteroids and showed signs of space weathering.
timeline eventHayabusa Samples Asteroid Itokawa
Japan's Hayabusa touches down on the asteroid Itokawa; despite great difficulties it returns to Earth in 2010 with the first samples ever collected from an asteroid.
mission milestoneFirst Asteroid Sample Return
Hayabusa returned the first samples ever collected from an asteroid, from Itokawa, to Earth.
Observation
How this was captured
- Source
- WIKIMEDIA
Data
Scientific data & provenance
Data & provenance
- Stable ID
asteroid:itokawa- Type
- Asteroid
- Domain
- Scientific connections
- Relationships
- 9
- Graph version
- 1.0.0
Dataset membership
Open data
In the graph export: graph.json · graph.jsonld
Planned API: GET /api/v0/entities/asteroid:itokawa
Scientific quality
Partial3 of 6 applicable dimensions complete, 1 partial
- Description
- Complete
- Source coverage
- Partial
- Relationship coverage
- Complete
- Review coverage
- None
- Citation coverage
- None
- Image coverage
- Complete
- Timeline coverage
- Not applicable
Scientific entity. Dimensions that cannot apply to this object are excluded rather than counted as gaps. See the evidence framework and authority dashboard.
You might also explore
- Mission programHayabusa programLinked through Hayabusa
- Sample-return capsuleHayabusa Sample-Return CapsuleLinked through Hayabusa
- OrganizationJAXA (Japan Aerospace Exploration Agency)Linked through Hayabusa
- Tracking networkJAXA Deep Space NetworkLinked through Hayabusa
- Mission classLander MissionLinked through Hayabusa
- Mission classRendezvous MissionLinked through Hayabusa
Sources & references
The primary and reference sources this topic draws on.
- NASA JPLJet Propulsion Laboratory / Solar System Dynamics
Orbital data, ephemerides, and small-body parameters for planets, asteroids, and comets.