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
2020-10-27 03:28:20 C 22 45 58.22 +28 41 51.1 V 703
2020-10-27 03:35:40 C 22 45 57.69 +28 41 41.1 V 703
2020-10-27 03:43:00 C 22 45 57.21 +28 41 33.9 V 703
2020-10-27 06:04:52 C 22 45 47.38 +28 38 37.4 U I41
2020-10-27 07:33:57 C 22 45 41.32 +28 36 43.1 U I41
2020-10-29 04:57:50 C 22 43 25.44 +27 40 15.1 U I41
2020-10-29 04:59:12 C 22 43 25.35 +27 40 13.3 U I41
2020-10-29 05:16:23 C 22 43 24.23 +27 39 50.7 U I41
2020-10-29 05:17:45 C 22 43 24.14 +27 39 48.9 U I41
2020-10-30 09:56:26 C 22 42 08.65 +27 02 22.7 q Q21
2020-10-30 10:02:35 C 22 42 08.28 +27 02 14.9 q Q21
2020-10-30 10:10:19 C 22 42 07.84 +27 02 04.7 q Q21
2020-10-30 10:27:18 C 22 42 06.78 +27 01 42.3 q Q21
2020-10-30 10:33:28 C 22 42 06.39 +27 01 33.9 q Q21
2020-10-30 10:41:11 C 22 42 05.93 +27 01 23.9 q Q21
2020-10-30 10:48:56 C 22 42 05.45 +27 01 13.4 q Q21
2020-10-30 10:50:28 C 22 42 05.35 +27 01 11.2 q Q21
2020-10-30 10:52:01 C 22 42 05.24 +27 01 09.7 q Q21
2020-10-31 08:02:57 C 22 41 10.56 +26 32 57.6 V T08
2020-10-31 08:08:56 C 22 41 10.22 +26 32 49.1 V T08
2020-10-31 08:21:35 C 22 41 09.46 +26 32 31.2 V T08
2020-10-31 08:45:02 C 22 41 08.10 +26 31 57.6 V T08
2020-10-31 09:47:51 C 22 41 09.46 +26 30 17.7 q Q21
2020-10-31 09:55:35 C 22 41 09.04 +26 30 06.3 q Q21
2020-10-31 10:03:19 C 22 41 08.58 +26 29 55.8 q Q21
2020-10-31 10:31:36 C 22 41 06.85 +26 29 17.1 q Q21
2020-10-31 10:47:07 C 22 41 05.96 +26 28 56.1 q Q21
2020-10-31 10:51:46 C 22 41 05.71 +26 28 49.7 q Q21
2020-10-31 10:56:22 C 22 41 05.44 +26 28 43.1 q Q21
2020-10-31 10:59:28 C 22 41 05.28 +26 28 39.2 q Q21
2020-10-31 20:10:32 C 22 40 43.12 +26 15 51.3 r 106
2020-10-31 20:24:59 C 22 40 42.39 +26 15 30.5 r 106
2020-10-31 20:39:27 C 22 40 41.60 +26 15 09.7 r 106
2020-10-31 20:53:54 C 22 40 40.84 +26 14 49.6 r 106
2020-11-01 21:39:44 C 22 39 47.18 +25 40 17.5 V J27
2020-11-01 21:44:35 C 22 39 46.94 +25 40 10.4 V J27
2020-11-01 21:48:08 C 22 39 46.77 +25 40 05.1 V J27
2020-11-02 09:01:46 C 22 39 22.58 +25 24 23.8 V T05
2020-11-02 09:17:05 C 22 39 21.81 +25 23 59.8 V T05
2020-11-02 09:21:06 C 22 39 21.65 +25 23 54.9 V T05
2020-11-02 09:26:23 C 22 39 21.37 +25 23 46.5 V T05
2020-11-03 04:06:01 C 22 38 48.93 +24 56 38.2 V 703
2020-11-03 04:13:51 C 22 38 48.53 +24 56 27.2 V 703
2020-11-03 04:21:41 C 22 38 48.17 +24 56 14.8 V 703
2020-11-03 04:29:31 C 22 38 47.79 +24 56 03.0 V 703
2020-11-03 17:42:08 C 22 38 27.82 +24 36 12.9 V K85
2020-11-03 20:06:31 C 22 38 21.75 +24 32 40.0 V K85
2020-11-04 04:18:11 C 22 38 07.80 +24 20 47.5 V 703
2020-11-04 04:25:48 C 22 38 07.46 +24 20 35.6 V 703
2020-11-04 04:33:26 C 22 38 07.12 +24 20 24.0 V 703
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)