In the Vinony graph
Vinony's link graph records 286 inbound references to 162173 Ryugu, and connects out to retrograde motion, Hayabusa2 and Momotarō.
It sits within the topics Apollo asteroids, Astronomical objects discovered in 1999 and Cg-type asteroids (SMASS).
Vinony links it to 42 Wikipedia language editions.
Key facts
- Discovered by
- LINEAR
- Discovery site
- Lincoln Lab's ETS
- Discovery date
- 10 May 1999
- Pronunciation
- Japanese: [ ɾjɯːɡɯː ] ;, in English, spelling-pronunciation / r aɪ ˈ j uː ɡ uː / or approximated / ˈ j uː ɡ uː / or / ˈ r uː ɡ uː /
- Named after
- Ryūgū , ("Dragon palace")
- Alternative designations
- 1999 JU 3
- Minor planet category
- Apollo · NEO · PHA
- Observation arc
- 30.32 yr (11,075 d)
- Aphelion
- 1.4159 AU
- Perihelion
- 0.9633 AU
- Semi major axis
- 1.1896 AU
- Orbital period sidereal
- 1.30 yr (474 d)
- Mean anomaly
- 3.9832 °
- Mean motion
- 0° 45 34.56 / day
- Inclination
- 5.8837°
- Longitude of ascending node
- 251.62°
- Argument of perihelion
- 211.43°
- Earth moid
- 0.0006 AU (0.2337 LD )
via Wikipedia infobox
Wikidata facts
- Instance of
- near-Earth asteroid
- Named after
- Ryūgū-jō
- Parent body
- Sun
- Minor-planet group
- Apollo asteroid
- Diameter
- 0.896
- Orbital period
- 474.7040169452296
- Image
- Ryugu rotation.gif
Show 19 more facts
- time of discovery or invention
- 1999-05-10
- discoverer or inventor
- Lincoln Near-Earth Asteroid Research
- provisional designation
- 1999 JU3
- orbital inclination
- 5.866551865769142
- orbital eccentricity
- 0.1910626231558206
- albedo
- 0.045
- Commons category
- 162173 Ryugu
- absolute magnitude
- 19.55
- mean anomaly
- 270.6593928357033
- argument of periapsis
- 211.6167659559647
- longitude of ascending node
- 251.2915331553314
- asteroid spectral type
- C-type asteroid
- rotation period
- 7.63262
- density
- 1.19
- semi-major axis of an orbit
- 1.190921090916117
- periapsis
- 0.9633805833140925
- apoapsis
- 1.418461598518142
- time of periapsis
- 2461118.306514159
- epoch
- November 21, 2025
Sources (2)
via Wikidata · CC0
~19 min read
Encyclopedic overview
162173 Ryugu (provisional designation 1999 JU3) is a near-Earth object and also a potentially hazardous asteroid of the Apollo group. It measures approximately 900 metres (3,000 ft) in diameter and is a dark object of the rare spectral type Cb, with qualities of both a C-type asteroid and a B-type asteroid. In June 2018, the Japanese spacecraft Hayabusa2 arrived at the asteroid. After making measurements and taking samples, Hayabusa2 left Ryugu for Earth in November 2019 and returned the sample capsule to Earth on 5 December 2020. The samples showed the presence of organic compounds, such as uracil (one of the four components in RNA) and vitamin B3.
Discovery and name
Excerpted from Wikipedia’s “162173 Ryugu” article, available under the CC BY-SA 4.0 licence.