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
2021-03-17 19:54:06 s 1 -198212.48 3 +162538.92 7500.0 C57
2021-03-17 20:04:06 S 10 38 39.149 -46 13 47.82 V C57
2021-03-17 20:04:06 s 1 -198223.93 5 +161832.24 4120.0 C57
2021-03-17 21:04:06 S 10 38 38.234 -46 11 40.49 V C57
2021-03-17 21:04:06 s 1 -198257.94 0 +157563.82 8020.0 C57
2021-03-17 21:14:06 S 10 38 38.239 -46 11 10.21 V C57
2021-03-17 21:14:06 s 1 -198257.74 4 +156847.68 2540.0 C57
2021-03-17 21:24:06 S 10 38 38.004 -46 10 52.07 V C57
2021-03-17 21:24:06 s 1 -198255.84 9 +156130.18 3840.0 C57
2021-03-17 21:34:06 S 10 38 37.834 -46 10 24.64 V C57
2021-03-17 21:34:06 s 1 -198252.24 6 +155411.32 1900.0 C57
2021-03-17 21:44:06 S 10 38 37.596 -46 10 03.76 V C57
2021-03-17 21:44:06 s 1 -198246.92 7 +154691.11 6700.0 C57
2021-03-17 21:54:06 S 10 38 37.589 -46 09 40.03 V C57
2021-03-17 21:54:06 s 1 -198239.88 3 +153969.53 8230.0 C57
2021-03-17 22:04:06 S 10 38 37.310 -46 09 18.32 V C57
2021-03-17 22:04:06 s 1 -198231.10 4 +153246.60 6460.0 C57
2021-03-17 22:14:06 S 10 38 37.152 -46 08 52.80 V C57
2021-03-17 22:14:06 s 1 -198220.58 2 +152522.31 1380.0 C57
2021-03-17 22:24:06 S 10 38 37.080 -46 08 31.78 V C57
2021-03-17 22:24:06 s 1 -198208.30 7 +151796.65 2980.0 C57
2021-03-17 22:34:06 S 10 38 37.042 -46 08 07.62 V C57
2021-03-17 22:34:06 s 1 -198194.27 0 +151069.63 1230.0 C57
2021-03-17 22:54:06 S 10 38 36.900 -46 07 23.27 V C57
2021-03-17 22:54:06 s 1 -198160.87 2 +149611.51 7620.0 C57
2021-03-17 23:24:06 S 10 38 36.288 -46 06 14.90 V C57
2021-03-17 23:24:06 s 1 -198097.32 6 +147414.10 1660.0 C57
2021-03-17 23:34:06 S 10 38 36.281 -46 05 49.45 V C57
2021-03-17 23:34:06 s 1 -198072.51 9 +146678.90 9450.0 C57
2021-03-17 23:44:06 S 10 38 35.971 -46 05 29.94 V C57
2021-03-17 23:44:06 s 1 -198045.88 3 +145942.34 3780.0 C57
2021-03-18 00:04:06 S 10 38 35.491 -46 04 42.96 V C57
2021-03-18 00:04:06 s 1 -197987.08 6 +144465.10 1920.0 C57
2021-03-18 00:14:06 S 10 38 35.599 -46 04 19.20 V C57
2021-03-18 00:14:06 s 1 -197954.90 5 +143724.43 5710.0 C57
2021-03-18 00:24:06 S 10 38 35.460 -46 03 56.45 V C57
2021-03-18 00:24:06 s 1 -197920.85 5 +142982.40 5940.0 C57
2021-03-18 00:34:06 S 10 38 35.184 -46 03 32.51 V C57
2021-03-18 00:34:06 s 1 -197884.92 7 +142238.99 2610.0 C57
2021-03-18 00:44:06 S 10 38 35.088 -46 03 10.51 V C57
2021-03-18 00:44:06 s 1 -197847.11 0 +141494.22 5690.0 C57
2021-03-18 00:54:06 S 10 38 34.920 -46 02 48.05 V C57
2021-03-18 00:54:06 s 1 -197807.39 4 +140748.07 5150.0 C57
2021-03-18 01:04:06 S 10 38 34.728 -46 02 25.80 V C57
2021-03-18 01:04:06 s 1 -197765.76 8 +140000.56 990.0 C57
2021-03-18 01:14:06 S 10 38 34.651 -46 01 58.94 V C57
2021-03-18 01:14:06 s 1 -197722.22 2 +139251.67 3180.0 C57
2021-03-18 01:24:06 S 10 38 34.457 -46 01 35.76 V C57
2021-03-18 01:24:06 s 1 -197676.74 6 +138501.42 1700.0 C57
2021-03-18 01:34:06 S 10 38 34.565 -46 01 16.90 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)