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
2021-03-23 00:54:06 S 10 47 15.475 -41 11 38.58 V C57
2021-03-23 00:54:06 s 1 +145798.13 3 +246044.62 6230.0 C57
2021-03-23 01:04:06 S 10 47 16.406 -41 11 19.64 V C57
2021-03-23 01:04:06 s 1 +145560.35 9 +246618.18 890.0 C57
2021-03-23 01:14:06 S 10 47 17.299 -41 11 01.86 V C57
2021-03-23 01:14:06 s 1 +145321.70 6 +247190.25 3740.0 C57
2021-03-23 01:24:06 S 10 47 18.070 -41 10 43.57 V C57
2021-03-23 01:24:06 s 1 +145082.17 9 +247760.83 4810.0 C57
2021-03-23 01:34:06 S 10 47 18.881 -41 10 25.18 V C57
2021-03-23 01:34:06 s 1 +144841.78 2 +248329.92 4100.0 C57
2021-03-23 01:44:06 S 10 47 19.584 -41 10 06.92 V C57
2021-03-23 01:44:06 s 1 +144600.52 0 +248897.52 1610.0 C57
2021-03-23 01:54:06 S 10 47 20.292 -41 09 47.12 V C57
2021-03-23 01:54:06 s 1 +144358.39 8 +249463.64 7360.0 C57
2021-03-23 02:04:06 S 10 47 21.653 -41 09 31.50 V C57
2021-03-23 02:04:06 s 1 +144115.42 0 +250028.27 1360.0 C57
2021-03-23 02:14:06 S 10 47 22.546 -41 09 12.96 V C57
2021-03-23 02:14:06 s 1 +143871.59 1 +250591.43 3610.0 C57
2021-03-23 02:24:06 S 10 47 22.915 -41 08 53.66 V C57
2021-03-23 02:24:06 s 1 +143626.91 5 +251153.10 4130.0 C57
2021-03-23 02:34:06 S 10 47 23.770 -41 08 36.02 V C57
2021-03-23 02:34:06 s 1 +143381.39 8 +251713.30 2920.0 C57
2021-03-23 02:44:06 S 10 47 24.494 -41 08 17.23 V C57
2021-03-23 02:44:06 s 1 +143135.04 3 +252272.03 0.0 C57
2021-03-23 02:54:06 S 10 47 25.320 -41 07 58.98 V C57
2021-03-23 02:54:06 s 1 +142887.85 5 +252829.29 5360.0 C57
2021-03-23 03:04:06 S 10 47 26.033 -41 07 41.81 V C57
2021-03-23 03:04:06 s 1 +142639.83 9 +253385.07 9030.0 C57
2021-03-23 03:14:06 S 10 47 26.914 -41 07 23.74 V C57
2021-03-23 03:14:06 s 1 +142390.99 8 +253939.39 1000.0 C57
2021-03-23 03:24:06 S 10 47 27.972 -41 07 05.05 V C57
2021-03-23 03:24:06 s 1 +142141.33 8 +254492.25 1300.0 C57
2021-03-23 03:34:06 S 10 47 28.632 -41 06 48.46 V C57
2021-03-23 03:34:06 s 1 +141890.86 3 +255043.64 9910.0 C57
2021-03-23 03:44:06 S 10 47 29.628 -41 06 28.98 V C57
2021-03-23 03:44:06 s 1 +141639.57 6 +255593.57 6870.0 C57
2021-03-23 03:54:06 S 10 47 30.326 -41 06 10.91 V C57
2021-03-23 03:54:06 s 1 +141387.48 4 +256142.04 2170.0 C57
2021-03-23 04:04:06 S 10 47 30.986 -41 05 52.08 V C57
2021-03-23 04:04:06 s 1 +141134.58 9 +256689.05 5810.0 C57
2021-03-23 04:14:06 S 10 47 31.906 -41 05 34.87 V C57
2021-03-23 04:14:06 s 1 +140880.89 6 +257234.61 7820.0 C57
2021-03-23 04:24:06 S 10 47 32.688 -41 05 16.55 V C57
2021-03-23 04:24:06 s 1 +140626.40 9 +257778.71 8200.0 C57
2021-03-23 04:34:06 S 10 47 33.646 -41 04 58.55 V C57
2021-03-23 04:34:06 s 1 +140371.13 3 +258321.37 6960.0 C57
2021-03-23 04:44:06 S 10 47 34.349 -41 04 42.46 V C57
2021-03-23 04:44:06 s 1 +140115.07 1 +258862.57 4090.0 C57
2021-03-23 04:54:06 S 10 47 35.030 -41 04 25.43 V C57
2021-03-23 04:54:06 s 1 +139858.22 8 +259402.33 9630.0 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)