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
2020-09-22 23:04:50 C 23 54 04.64 +34 15 22.7 – V L65
2020-09-22 23:21:49 C 23 54 03.21 +34 15 29.3 – V L65
2020-09-23 07:39:51 C 23 53 28.125 +34 18 48.51 – U F52
2020-09-23 07:47:12 C 23 53 27.496 +34 18 51.49 – U F52
2020-09-23 07:54:36 C 23 53 26.856 +34 18 54.55 – U F52
2020-09-25 06:33:30 C 23 49 49.83 +34 33 49.6 – V 703
2020-09-25 06:41:43 C 23 49 49.08 +34 33 51.7 – V 703
2020-09-25 06:49:53 C 23 49 48.32 +34 33 54.3 – V 703
2020-09-25 06:57:51 C 23 49 47.59 +34 33 56.6 – V 703
2020-09-25 08:33:33 C 23 49 41.171 +34 34 30.55 – U F52
2020-09-25 08:42:07 C 23 49 40.381 +34 34 33.23 – U F52
2020-09-25 08:50:40 C 23 49 39.594 +34 34 35.91 – U F52
2020-09-25 08:59:14 C 23 49 38.796 +34 34 38.61 – U F52
2020-09-25 10:16:43 C 23 49 31.52 +34 35 01.8 – V T08
2020-09-25 10:20:45 C 23 49 31.16 +34 35 02.7 – V T08
2020-09-25 11:11:20 C 23 49 26.43 +34 35 15.8 – V T08
2020-09-25 11:24:57 C 23 49 25.17 +34 35 19.0 – V T08
2020-09-25 13:34:24 C 23 49 17.56 +34 35 43.8 – q D29
2020-09-25 13:57:25 C 23 49 15.47 +34 35 51.4 – q D29
2020-09-25 14:20:28 C 23 49 13.38 +34 35 58.3 – q D29
2020-09-26 07:14:06 C 23 47 52.821 +34 40 25.33 – U F52
2020-09-26 07:47:26 C 23 47 49.724 +34 40 35.40 – U F52
2020-09-26 08:04:01 C 23 47 48.170 +34 40 40.21 – U F52
2020-09-26 08:30:02 C 23 47 45.716 +34 40 47.58 – U F52
2020-09-26 08:42:03 C 23 47 44.579 +34 40 50.94 – U F52
2020-09-26 08:53:55 C 23 47 43.451 +34 40 54.13 – U F52
2020-09-26 09:05:53 C 23 47 42.311 +34 40 57.29 – U F52
2020-09-26 10:29:43 C 23 47 34.24 +34 41 18.3 – V T08
2020-09-26 11:24:41 C 23 47 29.00 +34 41 29.9 – V T08
2020-09-26 12:03:51 C 23 47 25.32 +34 41 37.2 – V T08
2020-09-27 08:46:14 C 23 45 45.484 +34 46 12.51 – U F52
2020-09-27 08:55:50 C 23 45 44.550 +34 46 14.65 – U F52
2020-09-27 09:05:29 C 23 45 43.610 +34 46 16.80 – U F52
2020-09-27 09:15:12 C 23 45 42.660 +34 46 18.91 – U F52
2020-09-27 10:49:35 C 23 45 33.41 +34 46 37.1 – V T05
2020-09-27 11:36:59 C 23 45 28.85 +34 46 44.6 – V T05
2020-09-27 12:17:50 C 23 45 24.94 +34 46 50.4 – V T05
2020-09-27 12:26:50 C 23 45 24.10 +34 46 51.7 – V T05
2020-09-28 08:51:25 C 23 43 43.599 +34 50 35.09 – U F52
2020-09-28 09:00:56 C 23 43 42.646 +34 50 36.79 – U F52
2020-09-28 09:19:49 C 23 43 40.767 +34 50 40.08 – U F51
2020-09-28 09:28:36 C 23 43 39.887 +34 50 41.54 – U F51
2020-09-28 09:37:20 C 23 43 39.017 +34 50 42.93 – U F51
2020-09-28 10:36:40 C 23 43 33.10 +34 50 51.4 – V T05
2020-09-28 10:40:40 C 23 43 32.70 +34 50 52.1 – V T05
2020-09-28 10:48:36 C 23 43 31.91 +34 50 53.2 – V T05
2020-09-28 11:05:15 C 23 43 30.28 +34 50 55.2 – V T05
2020-09-29 08:32:02 C 23 41 41.687 +34 53 53.19 – U F51
2020-09-29 08:57:18 C 23 41 39.128 +34 53 56.73 – U F51
2020-09-29 09:09:54 C 23 41 37.847 +34 53 58.39 – U F51
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)