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
2021-03-13 11:14:06 s 1 -35576.833 0 +377354.18 7360.0 C57
2021-03-13 11:24:06 S 10 38 04.831 -49 36 55.08 V C57
2021-03-13 11:24:06 s 1 -35944.462 0 +377338.22 80.0 C57
2021-03-13 11:34:06 S 10 38 05.290 -49 36 38.12 V C57
2021-03-13 11:34:06 s 1 -36312.008 0 +377321.26 2710.0 C57
2021-03-13 11:44:06 S 10 38 05.494 -49 36 23.15 V C57
2021-03-13 11:44:06 s 1 -36679.468 0 +377303.29 5240.0 C57
2021-03-13 11:54:06 S 10 38 05.573 -49 36 02.09 V C57
2021-03-13 11:54:06 s 1 -37046.842 0 +377284.33 7670.0 C57
2021-03-13 12:04:06 S 10 38 05.983 -49 35 47.87 V C57
2021-03-13 12:04:06 s 1 -37414.129 0 +377264.36 0.0 C57
2021-03-13 12:14:06 S 10 38 06.336 -49 35 31.16 V C57
2021-03-13 12:14:06 s 1 -37781.328 0 +377243.39 2230.0 C57
2021-03-13 12:17:02 C 10 32 13.43 -49 13 02.3 q E89
2021-03-13 12:24:06 S 10 38 06.866 -49 35 12.05 V C57
2021-03-13 12:24:06 s 1 -38148.438 0 +377221.42 4350.0 C57
2021-03-13 12:34:06 S 10 38 06.910 -49 34 57.04 V C57
2021-03-13 12:34:06 s 1 -38515.458 0 +377198.45 6370.0 C57
2021-03-13 12:44:06 S 10 38 07.066 -49 34 35.40 V C57
2021-03-13 12:44:06 s 1 -38882.387 0 +377174.48 8270.0 C57
2021-03-13 12:54:06 S 10 38 07.663 -49 34 21.25 V C57
2021-03-13 12:54:06 s 1 -39249.224 0 +377149.51 70.0 C57
2021-03-13 13:04:06 S 10 38 07.817 -49 34 05.56 V C57
2021-03-13 13:04:06 s 1 -39615.968 0 +377123.54 1750.0 C57
2021-03-13 13:14:06 S 10 38 08.184 -49 33 45.86 V C57
2021-03-13 13:14:06 s 1 -39982.619 0 +377096.57 3320.0 C57
2021-03-13 13:24:06 S 10 38 08.016 -49 33 28.55 V C57
2021-03-13 13:24:06 s 1 -40349.175 0 +377068.60 4770.0 C57
2021-03-13 13:34:06 S 10 38 08.830 -49 33 08.93 V C57
2021-03-13 13:34:06 s 1 -40715.635 0 +377039.63 6110.0 C57
2021-03-13 13:44:06 S 10 38 08.794 -49 32 54.82 V C57
2021-03-13 13:44:06 s 1 -41081.999 0 +377009.65 7320.0 C57
2021-03-13 13:54:06 S 10 38 09.221 -49 32 34.69 V C57
2021-03-13 13:54:06 s 1 -41448.265 0 +376978.68 8410.0 C57
2021-03-13 14:04:06 S 10 38 09.497 -49 32 23.06 V C57
2021-03-13 14:04:06 s 1 -41814.432 0 +376946.72 9380.0 C57
2021-03-13 14:14:06 S 10 38 09.854 -49 32 04.42 V C57
2021-03-13 14:14:06 s 1 -42180.500 0 +376913.75 220.0 C57
2021-03-13 14:24:06 S 10 38 10.255 -49 31 42.92 V C57
2021-03-13 14:24:06 s 1 -42546.468 0 +376879.78 930.0 C57
2021-03-13 14:34:06 S 10 38 10.097 -49 31 29.53 V C57
2021-03-13 14:34:06 s 1 -42912.334 0 +376844.81 1510.0 C57
2021-03-13 14:44:06 S 10 38 10.402 -49 31 12.68 V C57
2021-03-13 14:44:06 s 1 -43278.098 0 +376808.85 1960.0 C57
2021-03-13 14:54:06 S 10 38 10.927 -49 30 53.60 V C57
2021-03-13 14:54:06 s 1 -43643.759 0 +376771.88 2270.0 C57
2021-03-13 15:04:06 S 10 38 11.280 -49 30 36.22 V C57
2021-03-13 15:04:06 s 1 -44009.315 0 +376733.92 2450.0 C57
2021-03-13 15:14:06 S 10 38 11.580 -49 30 15.19 V C57
2021-03-13 15:14:06 s 1 -44374.766 0 +376694.96 2490.0 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)