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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.


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Orbital Elements at Epoch 2455907.5 (2011-Dec-12.0) TDB
Reference: JPL 120 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1902257533711703 4.0878e-08  
a 1.189600821984975 3.3264e-09 au
q .9633081094119196 4.7907e-08 au
i 5.883742390778817 3.9603e-06 deg
node 251.6197109778495 3.7157e-05 deg
peri 211.4258497031505 4.1484e-05 deg
M 3.983244739497243 2.5274e-05 deg
tp 2455902.256336660653
(2011-Dec-06.75633666)		 3.3258e-05 TDB
period 473.9148422005283
1.30		 1.9878e-06
5.442e-09		 d
yr
n .7596301443702679 3.1861e-09 deg/d
Q 1.41589353455803 3.9592e-09 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.37188018015251E-14 1.654E-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)      725  
   data-arc span      11075 days (30.32 yr)  
   first obs. used      1986-04-14  
   last obs. used      2016-08-09  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .35206  
   source      ORB  
   producer      Davide Farnocchia  
   solution date      2018-Mar-28 16:14:14  

Additional Information
 Earth MOID = .000638309 au 
 Jupiter MOID = 3.70038 au 
 T_jup = 5.308 
 Yarkovsky a priori (-25+-25)e-15 au/d^2 
[ show covariance matrix ]

[ 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 19.3   n/a MPO385718  
rotation period rot_per 7.627 h n/a LCDB (Rev. 2019-January); 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.]
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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