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162173 Ryugu (1999 JU3)
Classification: Apollo [NEO, PHA]          SPK-ID: 2162173
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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
   # obs. used (total)      1939  
   data-arc span      12715 days (34.81 yr)  
   first obs. used      1986-04-14  
   last obs. used      2021-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .31648  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-10 05:21:51  

Additional Information
 Earth MOID = .000968339 au 
 Jupiter MOID = 3.69764 au 
 T_jup = 5.308 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ 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
   # obs. used (total)      1939  
   data-arc span      12715 days (34.81 yr)  
   first obs. used      1986-04-14  
   last obs. used      2021-02-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .31648  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-10 05:21:51  

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

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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 2015-09-28Last Updated: 2015-10-05

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