| 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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 210 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .1903011705441779 | 1.6954e-08 | |
| a | 1.189679557920382 | 3.381e-09 | au |
| q | .9632821454756528 | 2.1582e-08 | au |
| i | 5.881927287480608 | 1.394e-06 | deg |
| node | 251.5783333854791 | 1.0423e-05 | deg |
| peri | 211.4853167534898 | 1.3149e-05 | deg |
| M | 193.6376474004084 | 7.3026e-06 | deg |
| tp | 2459219.526154513412
(2021-Jan-05.02615451) | 8.9988e-06 | TDB |
| period | 473.9618933774443
1.30 | 2.0205e-06
5.532e-09 | d
yr |
| n | .7595547343155507 | 3.2379e-09 | deg/d |
| Q | 1.41607697036511 | 4.0244e-09 | au |
|
Additional Model Parameters
| Parameter | Value | Uncertainty (1-sigma) |
| A2 [EST] | -2.320389873283918E-14 | 1.123E-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
|
[ hide covariance matrix ]
Orbital Elements at Epoch 2458316.5 (2018-Jul-17.0) TDB
Reference: JPL 210 (heliocentric ecliptic J2000)
| Element | Value | Uncertainty (1-sigma) | Units |
| e | .1902745058602736 | 1.6866e-08 | |
| q | .9632147383477099 | 2.1131e-08 | au |
| tp | 2458271.624628178733
(2018-Jun-02.12462818) | 1.1678e-05 | TDB |
| node | 251.5892022017151 | 1.0423e-05 | deg |
| peri | 211.4356875779227 | 1.3171e-05 | deg |
| i | 5.884027573761514 | 1.3939e-06 | deg |
|
Additional Model Parameters
| Parameter | Value | Uncertainty (1-sigma) |
| A2 [EST] | -2.320389873283918E-14 | 1.123E-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
| Jupiter MOID = 3.69764 au |
| T_jup = 5.308 |
| Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 |
|
|
Orbit Covariance (7×7)
|
| |
e |
q |
tp |
node |
peri |
i |
A2 |
| e |
2.844516157622209E-16 |
-3.550375786440759E-16 |
8.407356954636948E-14 |
-5.856848226599644E-16 |
7.944178927769851E-14 |
5.242050732666697E-15 |
-6.562640057524985E-23 |
| q |
-3.550375786440759E-16 |
4.465316262801885E-16 |
-1.196985796084585E-13 |
1.009247755821749E-15 |
-1.072674137804778E-13 |
-7.325804874880359E-15 |
9.942866855356255E-23 |
| tp |
8.407356954636948E-14 |
-1.196985796084585E-13 |
1.363674565172141E-10 |
1.706417081358654E-12 |
9.198536083484136E-11 |
9.440737035766084E-12 |
-9.09829625301827E-20 |
| node |
-5.856848226599644E-16 |
1.009247755821749E-15 |
1.706417081358654E-12 |
1.086289867864619E-10 |
-1.068071867475597E-10 |
-5.068221519516744E-12 |
5.653149853435328E-22 |
| peri |
7.944178927769851E-14 |
-1.072674137804778E-13 |
9.198536083484136E-11 |
-1.068071867475597E-10 |
1.73471150235775E-10 |
1.171176119090698E-11 |
-5.43943394573381E-20 |
| i |
5.242050732666697E-15 |
-7.325804874880359E-15 |
9.440737035766084E-12 |
-5.068221519516744E-12 |
1.171176119090698E-11 |
1.943065674757368E-12 |
-4.49074449263381E-21 |
| A2 |
-6.562640057524985E-23 |
9.942866855356255E-23 |
-9.09829625301827E-20 |
5.653149853435328E-22 |
-5.43943394573381E-20 |
-4.49074449263381E-21 |
1.260253319069185E-28 |
|
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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