162173 Ryugu
Apollo asteroid / From Wikipedia, the free encyclopedia
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162173 Ryugu (provisional designation 1999 JU3) is a near-Earth object and 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,[11] with qualities of both a C-type asteroid and a B-type asteroid. In June 2018, the Japanese spacecraft Hayabusa2 arrived at the asteroid.[12] After making measurements and taking samples, Hayabusa2 left Ryugu for Earth in November 2019[13][14] and returned the sample capsule to Earth on 5 December 2020.[14] The samples showed the presence of organic compounds, such as uracil (one of the four components in RNA) and vitamin B3.
Discovery[1] | |
---|---|
Discovered by | LINEAR |
Discovery site | Lincoln Lab's ETS |
Discovery date | 10 May 1999 |
Designations | |
(162173) Ryugu | |
Pronunciation | /riˈuːɡuː/ Japanese: [ɾjɯːɡɯː] |
Named after | Ryūgū[1] ("Dragon palace") |
1999 JU3 | |
Apollo · NEO · PHA[1][2] | |
Orbital characteristics[2] | |
Epoch 12 December 2011 (JD 2455907.5) | |
Uncertainty parameter 0 | |
Observation arc | 30.32 yr (11,075 d) |
Aphelion | 1.4159 AU |
Perihelion | 0.9633 AU |
1.1896 AU | |
Eccentricity | 0.1902 |
1.30 yr (474 d) | |
3.9832° | |
0° 45m 34.56s / day | |
Inclination | 5.8837° |
251.62° | |
211.43° | |
Earth MOID | 0.0006 AU (0.2337 LD) |
Physical characteristics | |
Dimensions | 1004 m × 876 m[3] |
Mean radius | 448±2 m[3] |
Equatorial radius | 502±2 m[3] |
Polar radius | 438±2 m[3] |
Volume | 0.377±0.005 km3[3] |
Mass | (4.50±0.06)×1011 kg[3][4] |
Mean density | 1.19±0.03 g cm−3[3] |
Equatorial surface gravity | 1/80,000 g[4] |
7.63262±0.00002 h[3] | |
171.64°±0.03°[3] | |
North pole right ascension | +96.40°±0.03°[3] |
North pole declination | −66.40°±0.03°[3] |
0.037±0.002[5] 0.042±0.003[6] 0.047±0.003[7] 0.063±0.020[8] 0.07±0.01[9] 0.078±0.013[10] | |
SMASS = Cg[2] · C[7] · Cb[11] | |
18.69±0.07 (R)[10] 18.82[8] 19.2[5] 19.25±0.03[7] 19.3[1][2] | |