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
2020-10-04 00:39:29 C 23 31 38.25 +34 55 02.6 q I34
2020-10-04 01:06:09 C 23 31 35.55 +34 55 01.8 q I34
2020-10-04 01:40:24 C 23 31 32.00 +34 55 00.3 q I34
2020-10-04 02:11:06 C 23 31 28.84 +34 54 58.7 q I34
2020-10-04 06:15:12 C 23 31 07.508 +34 54 44.47 U F52
2020-10-04 06:22:36 C 23 31 06.732 +34 54 44.25 U F52
2020-10-04 06:30:02 C 23 31 05.955 +34 54 43.97 U F52
2020-10-04 06:37:27 C 23 31 05.177 +34 54 43.68 U F52
2020-10-04 08:00:28 C 23 30 53.66 +34 54 27.1 V 703
2020-10-04 08:08:25 C 23 30 52.82 +34 54 25.9 V 703
2020-10-04 08:16:21 C 23 30 51.98 +34 54 24.2 V 703
2020-10-04 08:24:18 C 23 30 51.13 +34 54 23.2 V 703
2020-10-05 07:20:33 C 23 28 43.96 +34 51 21.0 V 703
2020-10-05 07:28:39 C 23 28 43.06 +34 51 19.4 V 703
2020-10-05 07:36:45 C 23 28 42.16 +34 51 17.6 V 703
2020-10-05 07:44:51 C 23 28 41.35 +34 51 16.1 V 703
2020-10-05 09:45:04 C 23 28 30.90 +34 51 08.8 V T05
2020-10-05 10:04:15 C 23 28 28.80 +34 51 05.0 V T05
2020-10-05 10:08:53 C 23 28 28.27 +34 51 04.1 V T05
2020-10-05 10:16:57 C 23 28 27.45 +34 51 02.4 V T05
2020-10-05 10:36:46 C 23 28 25.284 +34 50 58.31 U F52
2020-10-05 10:56:09 C 23 28 23.198 +34 50 54.05 U F52
2020-10-05 18:28:09 C 23 27 44.89 +34 49 06.6 V K85
2020-10-05 18:57:10 C 23 27 41.99 +34 49 03.0 V K85
2020-10-06 06:31:58 C 23 26 37.266 +34 47 14.93 U F52
2020-10-06 06:41:11 C 23 26 36.277 +34 47 13.61 U F52
2020-10-06 06:48:13 C 23 26 32.72 +34 47 05.7 V G96
2020-10-06 06:50:23 C 23 26 35.286 +34 47 12.29 U F52
2020-10-06 06:55:38 C 23 26 31.93 +34 47 03.9 V G96
2020-10-06 06:59:34 C 23 26 34.292 +34 47 10.88 U F52
2020-10-06 07:03:02 C 23 26 31.12 +34 47 02.0 V G96
2020-10-06 07:10:26 C 23 26 30.32 +34 47 00.2 V G96
2020-10-06 08:17:32 C 23 26 22.83 +34 46 41.0 q H06
2020-10-06 08:42:27 C 23 26 20.27 +34 46 33.7 q H06
2020-10-06 09:09:50 C 23 26 17.39 +34 46 25.9 q H06
2020-10-06 16:19:48 C 23 25 41.02 +34 45 02.7 V N31
2020-10-06 16:30:25 C 23 25 39.87 +34 45 00.6 V N31
2020-10-06 16:41:00 C 23 25 38.71 +34 44 58.4 V N31
2020-10-06 16:51:37 C 23 25 37.56 +34 44 56.1 V N31
2020-10-06 17:02:13 C 23 25 36.39 +34 44 53.9 V N31
2020-10-06 17:14:40 C 23 25 35.04 +34 44 51.1 V N31
2020-10-07 06:06:42 C 23 24 22.04 +34 41 43.7 V 703
2020-10-07 06:14:27 C 23 24 21.20 +34 41 41.3 V 703
2020-10-07 06:22:06 C 23 24 20.29 +34 41 40.1 V 703
2020-10-07 06:29:44 C 23 24 19.52 +34 41 37.0 V 703
2020-10-07 10:58:23 C 23 23 52.83 +34 40 34.2 V T08
2020-10-07 11:03:02 C 23 23 52.31 +34 40 32.7 V T08
2020-10-07 11:39:26 C 23 23 48.42 +34 40 20.1 V T08
2020-10-07 11:47:28 C 23 23 47.57 +34 40 17.3 V T08
2020-10-07 20:22:05 C 23 23 03.88 +34 37 45.3 q Z36
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)