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
2020-11-08 09:42:51 C 22 36 15.57 +21 41 09.6 – q Q21
2020-11-08 09:44:24 C 22 36 15.51 +21 41 06.9 – q Q21
2020-11-08 09:50:42 C 22 36 15.34 +21 40 56.7 – q Q21
2020-11-08 09:57:00 C 22 36 15.15 +21 40 46.4 – q Q21
2020-11-08 10:00:08 C 22 36 15.05 +21 40 41.1 – q Q21
2020-11-08 16:41:56 C 22 36 12.35 +21 29 29.6 – q K73
2020-11-08 16:49:21 C 22 36 12.16 +21 29 16.4 – q K73
2020-11-08 17:00:55 C 22 36 11.87 +21 28 58.1 – q K73
2020-11-08 19:00:55 C 22 36 08.88 +21 25 36.6 – V G17
2020-11-08 19:03:55 C 22 36 08.81 +21 25 31.6 – V G17
2020-11-08 19:06:55 C 22 36 08.72 +21 25 26.7 – V G17
2020-11-08 19:39:40 C 22 36 07.86 +21 24 31.5 – V 160
2020-11-08 19:42:44 C 22 36 07.80 +21 24 26.2 – V 160
2020-11-08 19:45:48 C 22 36 07.71 +21 24 21.1 – V 160
2020-11-08 22:06:42 C 22 36 05.49 +21 20 45.1 – V G40
2020-11-08 22:11:30 C 22 36 05.36 +21 20 36.9 – V G40
2020-11-08 22:16:21 C 22 36 05.22 +21 20 28.6 – V G40
2020-11-09 09:20:26 C 22 36 02.60 +21 01 46.6 – q Q21
2020-11-09 09:28:01 C 22 36 02.34 +21 01 35.1 – q Q21
2020-11-09 09:37:05 C 22 36 02.11 +21 01 19.6 – q Q21
2020-11-09 09:52:14 C 22 36 01.73 +21 00 54.1 – q Q21
2020-11-09 10:11:01 C 22 36 01.21 +21 00 22.4 – q Q21
2020-11-09 11:43:33 C 22 35 58.92 +20 57 46.8 – q Q11
2020-11-09 11:56:04 C 22 35 58.61 +20 57 25.1 – q Q11
2020-11-09 12:01:22 C 22 35 58.47 +20 57 15.8 – q Q11
2020-11-09 17:02:49 C 22 35 59.83 +20 48 39.4 – q K73
2020-11-09 17:09:04 C 22 35 59.65 +20 48 29.1 – q K73
2020-11-09 18:28:39 C 22 35 57.71 +20 46 15.4 – q K73
2020-11-09 21:06:08 C 22 35 54.88 +20 41 36.1 – V A16
2020-11-09 21:26:53 C 22 35 54.47 +20 40 59.7 – V A16
2020-11-09 21:47:38 C 22 35 54.11 +20 40 23.4 – V A16
2020-11-09 22:25:00 C 22 35 53.48 +20 39 17.3 – V A16
2020-11-10 08:34:57 C 22 35 49.98 +20 22 29.5 – V T05
2020-11-10 08:40:14 C 22 35 49.89 +20 22 19.9 – V T05
2020-11-10 08:49:29 C 22 35 49.71 +20 22 03.4 – V T05
2020-11-10 17:52:03 C 22 35 51.92 +20 06 07.1 – q K73
2020-11-10 18:15:15 C 22 35 51.85 +20 05 23.0 – V K83
2020-11-10 18:23:42 C 22 35 51.68 +20 05 08.4 – V K83
2020-11-10 19:42:25 C 22 35 49.67 +20 02 54.5 – q K73
2020-11-10 19:50:50 C 22 35 49.57 +20 02 39.0 – q K73
2020-11-11 03:00:56 C 22 35 50.02 +19 50 23.9 – V G96
2020-11-11 03:08:34 C 22 35 49.86 +19 50 10.4 – V G96
2020-11-11 03:16:08 C 22 35 49.68 +19 49 57.1 – V G96
2020-11-11 03:23:44 C 22 35 49.52 +19 49 43.6 – V G96
2020-11-11 03:38:09 C 22 35 49.70 +19 49 16.8 – U I41
2020-11-11 03:39:30 C 22 35 49.67 +19 49 14.5 – U I41
2020-11-11 03:40:52 C 22 35 49.64 +19 49 12.1 – U I41
2020-11-11 05:57:46 C 22 35 47.03 +19 45 06.4 – U I41
2020-11-11 10:27:31 C 22 35 49.64 +19 37 17.9 – q Q11
2020-11-11 10:39:56 C 22 35 49.39 +19 36 55.7 – q Q11
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)