| 162173 Ryugu (1999 JU3) |
| Classification: Apollo [NEO, PHA] SPK-ID: 2162173 |
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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 223 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .190994368735439 | 1.341e-08 | |
| a | 1.190568664023588 | 3.7855e-09 | au |
| q | .9631767536022081 | 1.7065e-08 | au |
| i | 5.883716004488853 | 1.3378e-06 | deg |
| node | 251.5358516932583 | 1.0406e-05 | deg |
| peri | 211.4437098110785 | 1.2689e-05 | deg |
| M | 345.6399297484306 | 6.5383e-06 | deg |
| tp | 2459219.427103723540
(2021-Jan-04.92710372) | 8.5513e-06 | TDB |
| period | 474.4933152210464
1.30 | 2.263e-06
6.196e-09 | d
yr |
| n | .7587040500924469 | 3.6185e-09 | deg/d |
| Q | 1.417960574444968 | 4.5085e-09 | au |
|
Additional Model Parameters
| Parameter | Value | Uncertainty (1-sigma) |
| A2 [EST] | -2.101947937820556E-14 | 1.069E-14 |
| ALN [SET] | 1. | n/a |
| NK [SET] | 0. | n/a |
| NM [SET] | 2. | n/a |
| R0 [SET] | 1. | n/a |
|
| | Orbit Determination Parameters
Additional Information
|
[ show covariance matrix ]
Physical Parameter Table
| Parameter |
Symbol |
Value |
Units |
Sigma |
Reference |
Notes |
| absolute magnitude |
H |
19.39 |
|
n/a |
E2021B55 |
|
| rotation period |
rot_per |
7.63262 |
h |
n/a |
LCDB (Rev. 2020-October); Warner et al., 2009 |
Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Abe, M.; Kawakami, K.; Hasegawa, S.; Kuroda, D.; Yoshikawa, M.; et al. (2008) Lunar & Planetary Sci. XXXIX. No. 1391, p. 1594.]
[Muller, T.G.; Durech, J.; Hasegawa, S.; Abe, M.; et al. (2011) Astron. Astrophys. 525, A145.]
[Kim, M.-J.; Choi, Y.-J.; Moon, H.-K.; Ishiguro, M.; et al. (2013) Astron. Astrophys. 550, L11.]
[Moskovitz, N.A.; Abe, S.; Pan, K.-S.; Osip, D.J.; et al. (2013) Icarus 224, 24.]
[Muller, T.G.; Durech, J.; Ishiguro, M.; Mueller, M.; et al. (2017) Astron. Astrophys. 599, A103.]
[Watanabe, S.; Hirabayashi, M.; Hirata, N.; Hirata, Na.; et al. (2019) Science 364, 267-272.]
[Warner, B.D.; Stephens, R.D. (2021) Minor Planet Bull. 48-1, submitted. (NEA) http://www.planetarysciences.org/lightcurves.html] |
| SMASSII spectral type |
spec_B |
Cg |
|
n/a |
Binzel et al. (2001) Icarus 151, 139-149 |
|
|
| 162173 Ryugu | Discovered 1999 May 10 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro. |
| Ryugu is the undersea palace of the Dragon God. In a Japanese legend, a fisherman was rewarded with a visit to Ryugu and brought back a box with a secret. The spaceprobe Hayabusa 2 will visit this asteroid and bring back a capsule containing surface samples. |
| NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) |
| Reference: MPC batch dated 2015-09-28 | Last Updated: 2015-10-05 |
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