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
2020-08-13 14:38:44 C 00 14 32.53 +22 01 38.1 – V T05
2020-08-13 14:42:48 C 00 14 32.57 +22 01 41.8 – V T05
2020-08-13 14:53:47 C 00 14 32.76 +22 01 51.7 – V T05
2020-08-13 15:01:51 C 00 14 32.92 +22 01 59.1 – V T05
2020-08-13 17:58:49 C 00 14 37.57 +22 04 35.2 – q Q11
2020-08-13 18:03:59 C 00 14 37.64 +22 04 39.9 – q Q11
2020-08-13 18:18:20 C 00 14 37.90 +22 04 52.8 – q Q11
2020-08-14 10:23:30 C 00 14 59.67 +22 19 30.3 – V G96
2020-08-14 10:27:53 C 00 14 59.74 +22 19 34.2 – V G96
2020-08-14 11:01:40 C 00 15 00.29 +22 20 04.6 – V G96
2020-08-14 17:10:11 C 00 15 08.71 +22 25 38.5 – q Q11
2020-08-14 17:18:25 C 00 15 08.83 +22 25 46.0 – q Q11
2020-08-14 17:27:10 C 00 15 08.97 +22 25 54.0 – q Q11
2020-08-16 02:00:29 C 00 15 49.12 +22 55 26.8 – q G40
2020-08-16 02:20:24 C 00 15 49.39 +22 55 45.1 – q G40
2020-08-16 02:40:03 C 00 15 49.63 +22 56 03.3 – q G40
2020-08-16 11:42:46 C 00 15 59.96 +23 04 18.0 – V T08
2020-08-16 11:46:46 C 00 15 59.97 +23 04 21.4 – V T08
2020-08-16 11:50:44 C 00 16 00.05 +23 04 25.4 – V T08
2020-08-16 11:58:17 C 00 16 00.13 +23 04 32.2 – V T08
2020-08-17 09:38:00 C 00 16 22.63 +23 24 03.3 – V G96
2020-08-17 09:44:15 C 00 16 22.77 +23 24 09.1 – V G96
2020-08-17 09:46:41 C 00 16 22.80 +23 24 11.2 – V G96
2020-08-17 14:43:09 C 00 16 28.54 +23 28 36.6 – q Q11
2020-08-17 14:50:24 C 00 16 28.61 +23 28 43.3 – q Q11
2020-08-17 15:05:49 C 00 16 28.79 +23 28 57.6 – q Q11
2020-08-18 10:33:17 C 00 16 47.205 +23 46 36.71 – U F51
2020-08-18 10:50:58 C 00 16 47.370 +23 46 53.03 – U F51
2020-08-18 11:26:19 C 00 16 47.678 +23 47 25.46 – U F51
2020-08-18 11:32:12 C 00 16 47.72 +23 47 30.7 – V T05
2020-08-18 11:39:42 C 00 16 47.78 +23 47 38.0 – V T05
2020-08-18 11:44:18 C 00 16 47.82 +23 47 41.9 – V T05
2020-08-18 11:51:34 C 00 16 47.89 +23 47 47.7 – V T05
2020-08-22 11:08:41 C 00 17 51.45 +25 13 12.7 – V T05
2020-08-22 11:11:19 C 00 17 51.47 +25 13 15.1 – V T05
2020-08-22 11:15:17 C 00 17 51.41 +25 13 18.7 – V T05
2020-08-22 11:23:11 C 00 17 51.47 +25 13 26.3 – V T05
2020-08-23 15:07:45 C 00 18 01.61 +25 37 57.3 – S Q21
2020-08-23 15:23:16 C 00 18 01.59 +25 38 11.6 – S Q21
2020-08-23 16:49:09 C 00 18 01.49 +25 39 28.5 – S Q21
2020-08-23 17:24:21 C 00 18 01.39 +25 39 59.4 – S Q21
2020-08-24 11:06:29 C 00 18 06.42 +25 55 43.9 – V T08
2020-08-24 11:09:10 C 00 18 06.39 +25 55 46.8 – V T08
2020-08-24 11:13:48 C 00 18 06.37 +25 55 50.4 – V T08
2020-08-24 11:43:30 C 00 18 06.26 +25 56 17.3 – V T08
2020-08-26 01:21:47 C 00 18 09.18 +26 29 09.1 – V 160
2020-08-26 01:25:54 C 00 18 09.18 +26 29 12.5 – V 160
2020-08-26 01:29:35 C 00 18 09.14 +26 29 15.9 – V 160
2020-08-26 06:08:43 C 00 18 10.18 +26 33 13.7 – V U55
2020-08-26 06:14:56 C 00 18 10.14 +26 33 18.9 – V U55
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)