IAA RAS IAA Minor Planet Database

162173 Ryugu (1999 JU3)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.1910626253 ± 2.00e+00
Semi-major axis (a)1.1909211747 AU ± 3.00e+00
Inclination (i)5.86654965° ± 4.00e+00
Long. of Asc. Node (Ω)251.29160345° ± 5.00e+00
Arg. of Perihelion (ω)211.61670373° ± 6.00e+00
Mean Anomaly (M)270.65926628° ± 7.56e-06
Mean Motion (n)0.7583815353°/day ± 2.87e+00
Perihelion dist (q)0.96338065 AU ± 3.40e+00
Aphelion dist (Q)1.41846170 AU ± 4.29e+00
Orbital Period1.29964436 yr ± 4.91e+00
NGA Modelr2
A21.49982929e-05 AU/d²
Physical Parameters
H (abs. magnitude)19.55
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-04-27
RMS Residual0.086″
Uncertainty0
Orbit TypeApollo
MOID0.000212 AU
Observations Used4741
Gaia Obs Used94
Oppositions7
Arc Total1986-2016
First Observation Used1999-05-10
Last Observation Used2025-07-23
Observations (7718)
Date Type RA Dec Mag Band Observatory
2021-03-12 11:44:06 s 1 +16643.432 0 +369445.82 2090.0 – C57
2021-03-12 11:54:06 S 10 37 13.512 -50 16 27.95 – V C57
2021-03-12 11:54:06 s 1 +16273.636 0 +369574.14 6020.0 – C57
2021-03-12 12:04:06 S 10 37 13.891 -50 16 15.31 – V C57
2021-03-12 12:04:06 s 1 +15903.785 0 +369701.41 9750.0 – C57
2021-03-12 12:14:06 S 10 37 14.429 -50 15 58.36 – V C57
2021-03-12 12:14:06 s 1 +15533.879 0 +369827.62 3290.0 – C57
2021-03-12 12:24:06 S 10 37 15.067 -50 15 42.37 – V C57
2021-03-12 12:24:06 s 1 +15163.919 0 +369952.79 6630.0 – C57
2021-03-12 12:34:06 S 10 37 15.336 -50 15 25.45 – V C57
2021-03-12 12:34:06 s 1 +14793.908 0 +370076.90 9790.0 – C57
2021-03-12 12:44:06 S 10 37 15.158 -50 15 08.60 – V C57
2021-03-12 12:44:06 s 1 +14423.845 0 +370199.96 2770.0 – C57
2021-03-12 12:54:06 S 10 37 15.931 -50 14 49.38 – V C57
2021-03-12 12:54:06 s 1 +14053.731 0 +370321.97 5560.0 – C57
2021-03-12 13:04:06 S 10 37 16.560 -50 14 34.76 – V C57
2021-03-12 13:04:06 s 1 +13683.569 0 +370442.93 8170.0 – C57
2021-03-12 13:14:06 S 10 37 16.901 -50 14 19.50 – V C57
2021-03-12 13:14:06 s 1 +13313.359 0 +370562.84 610.0 – C57
2021-03-12 13:24:06 S 10 37 17.506 -50 14 02.44 – V C57
2021-03-12 13:24:06 s 1 +12943.102 0 +370681.71 2870.0 – C57
2021-03-12 13:34:06 S 10 37 17.611 -50 13 44.62 – V C57
2021-03-12 13:34:06 s 1 +12572.798 0 +370799.52 4950.0 – C57
2021-03-12 13:44:06 S 10 37 18.353 -50 13 28.85 – V C57
2021-03-12 13:44:06 s 1 +12202.450 0 +370916.29 6860.0 – C57
2021-03-12 14:04:06 S 10 37 19.042 -50 12 50.58 – V C57
2021-03-12 14:04:06 s 1 +11461.624 0 +371146.68 170.0 – C57
2021-03-12 14:54:06 S 10 37 20.806 -50 11 33.54 – V C57
2021-03-12 15:04:06 S 10 37 21.552 -50 11 14.24 – V C57
2021-03-12 15:14:06 S 10 37 22.190 -50 10 59.02 – V C57
2021-03-12 15:24:06 S 10 37 22.440 -50 10 41.16 – V C57
2021-03-12 15:34:06 S 10 37 22.764 -50 10 25.43 – V C57
2021-03-12 15:44:06 S 10 37 23.417 -50 10 11.75 – V C57
2021-03-12 15:54:06 S 10 37 23.551 -50 09 53.35 – V C57
2021-03-12 16:04:06 S 10 37 23.935 -50 09 37.55 – V C57
2021-03-12 16:14:06 S 10 37 24.487 -50 09 19.69 – V C57
2021-03-12 16:24:06 S 10 37 24.576 -50 09 01.40 – V C57
2021-03-12 16:34:06 S 10 37 25.013 -50 08 44.34 – V C57
2021-03-12 16:44:06 S 10 37 26.124 -50 08 29.40 – V C57
2021-03-12 16:54:06 S 10 37 26.119 -50 08 08.23 – V C57
2021-03-12 17:04:06 S 10 37 26.942 -50 07 54.88 – V C57
2021-03-12 17:14:06 S 10 37 26.863 -50 07 40.22 – V C57
2021-03-12 17:24:06 S 10 37 27.240 -50 07 22.22 – V C57
2021-03-12 17:34:06 S 10 37 27.492 -50 07 09.23 – V C57
2021-03-12 17:44:06 S 10 37 28.183 -50 06 49.86 – V C57
2021-03-12 18:04:06 S 10 37 28.954 -50 06 18.22 – V C57
2021-03-12 18:14:06 S 10 37 29.530 -50 06 02.05 – V C57
2021-03-12 18:24:06 S 10 37 29.765 -50 05 42.32 – V C57
2021-03-12 18:44:06 S 10 37 30.492 -50 05 09.42 – V C57
2021-03-12 18:54:06 S 10 37 30.689 -50 04 53.51 – V C57
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2020-12-12 03:00:00 70251762.49 2 us 8560 -14 -14
2020-12-18 01:10:00 64846561.92 2 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m)