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
2021-05-12 05:44:09 C 11 56 33.21 -12 07 02.1 – V G96
2021-05-12 05:51:43 C 11 56 33.71 -12 06 57.5 – V G96
2021-05-12 07:58:17 C 11 56 43.25 -12 05 37.8 – V T05
2021-05-12 08:04:15 C 11 56 43.69 -12 05 34.2 – V T05
2021-05-12 08:14:10 C 11 56 44.28 -12 05 27.6 – V T05
2021-05-12 08:14:50 C 11 56 44.34 -12 05 27.4 – V T05
2021-05-12 08:22:11 C 11 56 44.85 -12 05 23.0 – V T05
2021-05-12 08:26:11 C 11 56 45.12 -12 05 20.5 – V T05
2021-05-12 08:36:51 C 11 56 45.80 -12 05 13.8 – V T05
2021-05-12 08:40:49 C 11 56 46.12 -12 05 11.9 – V T05
2021-05-15 08:03:19 C 12 02 01.20 -11 25 22.4 – V T05
2021-05-15 08:08:37 C 12 02 01.53 -11 25 19.9 – V T05
2021-05-15 08:16:33 C 12 02 02.07 -11 25 15.9 – V T05
2021-05-15 08:32:36 C 12 02 03.17 -11 25 06.6 – V T05
2021-05-15 11:21:40 C 12 02 17.026 -11 23 21.66 – V P07
2021-05-15 11:25:55 C 12 02 17.318 -11 23 20.08 – V P07
2021-05-15 12:03:55 C 12 02 19.860 -11 23 00.92 – V P07
2021-05-15 13:43:25 C 12 02 26.578 -11 22 09.84 – V P07
2021-05-18 07:49:35 C 12 07 22.82 -10 51 09.7 – V T08
2021-05-18 07:57:33 C 12 07 23.34 -10 51 05.7 – V T08
2021-05-18 08:12:12 C 12 07 24.38 -10 51 00.4 – V T08
2021-05-18 08:20:10 C 12 07 24.95 -10 50 56.2 – V T08
2021-06-11 04:43:48 C 12 52 19.84 -08 59 51.5 – V G96
2021-06-11 04:51:23 C 12 52 20.45 -08 59 51.2 – V G96
2021-06-11 04:58:56 C 12 52 21.02 -08 59 51.3 – V G96
2021-06-11 05:06:29 C 12 52 21.62 -08 59 51.1 – V G96
2021-06-14 16:26:30 S 12 59 11.22 -09 01 24.1 – L C51
2021-06-14 19:34:39 S 12 59 26.74 -09 01 32.4 – L C51
2021-06-14 22:42:57 S 12 59 42.221 -09 01 40.26 – L C51
2021-06-15 01:51:05 S 12 59 57.734 -09 01 49.15 – L C51
2021-06-15 04:58:41 S 13 00 13.17 -09 01 58.2 – L C51
2021-06-15 08:07:33 S 13 00 28.71 -09 02 07.2 – L C51
2021-06-15 08:07:43 S 13 00 28.74 -09 02 07.1 – L C51
2021-06-15 09:41:48 S 13 00 36.52 -09 02 11.7 – L C51
2021-06-15 11:15:51 S 13 00 44.30 -09 02 16.3 – L C51
2021-06-15 12:49:22 S 13 00 51.96 -09 02 21.0 – L C51
2021-06-15 14:24:11 S 13 00 59.66 -09 02 25.3 – L C51
2021-06-15 15:58:14 S 13 01 07.55 -09 02 31.6 – L C51
2021-06-15 17:32:19 S 13 01 15.34 -09 02 36.3 – L C51
2021-06-15 19:06:23 S 13 01 23.08 -09 02 39.9 – L C51
2021-06-15 19:06:34 S 13 01 23.09 -09 02 40.8 – L C51
2021-06-15 20:40:37 S 13 01 30.83 -09 02 45.9 – L C51
2021-06-15 22:14:42 S 13 01 38.669 -09 02 50.71 – L C51
2021-06-16 01:23:00 S 13 01 54.19 -09 03 02.0 – L C51
2021-06-16 04:31:09 S 13 02 09.718 -09 03 11.16 – L C51
2021-06-16 07:39:28 S 13 02 25.28 -09 03 23.9 – L C51
2021-06-16 10:47:35 S 13 02 40.80 -09 03 35.2 – L C51
2021-06-16 13:55:55 S 13 02 56.41 -09 03 45.9 – L C51
2021-06-20 19:52:50 S 13 11 25.373 -09 12 20.41 – L C51
2021-06-21 00:35:13 S 13 11 48.967 -09 12 52.96 – L C51
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)