IAA RAS IAA Minor Planet Database

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
2020-10-03 21:55:40 C 23 31 52.09 +34 55 26.1 – q Z36
2020-10-03 21:56:47 C 23 31 52.00 +34 55 26.4 – q Z36
2020-10-03 21:57:55 C 23 31 51.89 +34 55 25.8 – q Z36
2020-10-03 21:59:04 C 23 31 51.75 +34 55 26.5 – q Z36
2020-10-03 22:00:13 C 23 31 51.64 +34 55 26.3 – q Z36
2020-10-03 22:01:22 C 23 31 51.51 +34 55 26.5 – q Z36
2020-10-03 22:02:29 C 23 31 51.40 +34 55 25.5 – q Z36
2020-10-03 22:03:38 C 23 31 51.28 +34 55 25.4 – q Z36
2020-10-03 22:04:47 C 23 31 51.12 +34 55 26.0 – q Z36
2020-10-03 22:05:55 C 23 31 51.01 +34 55 25.8 – q Z36
2020-10-03 22:07:02 C 23 31 50.90 +34 55 25.9 – q Z36
2020-10-03 22:08:11 C 23 31 50.75 +34 55 25.7 – q Z36
2020-10-03 22:09:20 C 23 31 50.71 +34 55 26.4 – q Z36
2020-10-03 22:10:28 C 23 31 50.56 +34 55 25.4 – q Z36
2020-10-03 22:11:35 C 23 31 50.42 +34 55 25.7 – q Z36
2020-10-03 22:12:44 C 23 31 50.36 +34 55 25.4 – q Z36
2020-10-03 22:13:52 C 23 31 50.17 +34 55 25.2 – q Z36
2020-10-03 22:14:59 C 23 31 50.09 +34 55 25.0 – q Z36
2020-10-03 22:16:08 C 23 31 50.00 +34 55 25.2 – q Z36
2020-10-03 22:17:17 C 23 31 49.84 +34 55 25.3 – q Z36
2020-10-03 22:18:25 C 23 31 49.75 +34 55 25.2 – q Z36
2020-10-03 22:19:32 C 23 31 49.65 +34 55 25.1 – q Z36
2020-10-03 22:20:40 C 23 31 49.50 +34 55 24.3 – q Z36
2020-10-03 22:21:50 C 23 31 49.33 +34 55 24.6 – q Z36
2020-10-03 22:22:58 C 23 31 49.20 +34 55 24.8 – q Z36
2020-10-03 22:24:05 C 23 31 49.11 +34 55 24.5 – q Z36
2020-10-03 22:25:14 C 23 31 49.02 +34 55 24.5 – q Z36
2020-10-03 22:26:22 C 23 31 48.91 +34 55 24.4 – q Z36
2020-10-03 22:27:29 C 23 31 48.74 +34 55 24.5 – q Z36
2020-10-03 22:28:38 C 23 31 48.64 +34 55 24.0 – q Z36
2020-10-03 22:29:47 C 23 31 48.50 +34 55 23.9 – q Z36
2020-10-03 22:45:42 C 23 31 46.82 +34 55 23.0 – q Z36
2020-10-03 22:46:50 C 23 31 46.70 +34 55 22.8 – q Z36
2020-10-03 22:48:00 C 23 31 46.59 +34 55 22.7 – q Z36
2020-10-03 22:49:08 C 23 31 46.45 +34 55 22.3 – q Z36
2020-10-03 22:50:15 C 23 31 46.37 +34 55 22.6 – q Z36
2020-10-03 22:51:23 C 23 31 46.19 +34 55 22.5 – q Z36
2020-10-03 22:52:33 C 23 31 46.05 +34 55 22.6 – q Z36
2020-10-03 22:53:41 C 23 31 45.98 +34 55 22.3 – q Z36
2020-10-03 22:54:48 C 23 31 45.86 +34 55 21.9 – q Z36
2020-10-03 22:55:57 C 23 31 45.72 +34 55 22.4 – q Z36
2020-10-03 22:57:06 C 23 31 45.63 +34 55 21.7 – q Z36
2020-10-03 22:58:14 C 23 31 45.50 +34 55 21.5 – q Z36
2020-10-03 22:59:23 C 23 31 45.38 +34 55 21.9 – q Z36
2020-10-03 23:00:30 C 23 31 45.25 +34 55 21.3 – q Z36
2020-10-03 23:01:39 C 23 31 45.11 +34 55 21.1 – q Z36
2020-10-03 23:02:48 C 23 31 45.00 +34 55 21.5 – q Z36
2020-10-03 23:03:55 C 23 31 44.91 +34 55 21.2 – q Z36
2020-10-03 23:05:03 C 23 31 44.77 +34 55 21.0 – q Z36
2020-10-03 23:06:12 C 23 31 44.66 +34 55 21.0 – 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)