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
2021-04-22 04:07:58 C 11 23 30.41 -19 38 05.0 V 703
2021-04-22 04:15:34 C 11 23 30.79 -19 37 55.5 V 703
2021-04-22 04:23:11 C 11 23 31.25 -19 37 45.7 V 703
2021-04-22 04:30:46 C 11 23 31.64 -19 37 35.6 V 703
2021-04-23 07:52:13 C 11 25 17.01 -19 02 25.0 V T08
2021-04-23 08:40:35 C 11 25 19.62 -19 01 24.0 V T08
2021-04-23 08:45:13 C 11 25 19.89 -19 01 17.9 V T08
2021-04-23 08:53:11 C 11 25 20.32 -19 01 07.8 V T08
2021-04-27 09:09:16 C 11 31 39.59 -17 07 33.8 V T08
2021-04-27 09:23:53 C 11 31 40.44 -17 07 17.1 V T08
2021-04-27 09:28:33 C 11 31 40.71 -17 07 11.8 V T08
2021-04-27 09:36:33 C 11 31 41.15 -17 07 03.3 V T08
2021-04-29 10:37:47 C 11 34 58.21 -16 14 53.3 V T05
2021-04-29 10:42:26 C 11 34 58.42 -16 14 48.4 V T05
2021-04-29 11:00:28 C 11 34 59.57 -16 14 29.5 V T05
2021-04-29 11:13:43 C 11 35 00.35 -16 14 15.4 V T05
2021-04-30 08:38:18 C 11 36 28.54 -15 52 42.9 V T05
2021-04-30 08:42:56 C 11 36 28.82 -15 52 38.1 V T05
2021-04-30 08:52:11 C 11 36 29.36 -15 52 29.0 V T05
2021-04-30 09:08:03 C 11 36 30.30 -15 52 12.7 V T05
2021-05-01 09:03:47 C 11 38 08.15 -15 28 53.7 V T08
2021-05-01 09:49:28 C 11 38 10.91 -15 28 09.5 V T08
2021-05-01 09:56:48 C 11 38 11.41 -15 28 02.4 V T08
2021-05-01 10:01:30 C 11 38 11.67 -15 27 57.3 V T08
2021-05-02 08:27:23 C 11 39 44.69 -15 06 55.8 V T08
2021-05-02 08:32:02 C 11 39 44.97 -15 06 51.5 V T08
2021-05-02 08:43:19 C 11 39 45.69 -15 06 40.9 V T08
2021-05-02 08:46:40 C 11 39 45.86 -15 06 37.8 V T08
2021-05-02 08:51:19 C 11 39 46.14 -15 06 33.4 V T08
2021-05-02 08:58:37 C 11 39 46.62 -15 06 26.8 V T08
2021-05-02 08:59:16 C 11 39 46.61 -15 06 26.2 V T08
2021-05-02 09:50:17 C 11 39 49.77 -15 05 39.2 V T08
2021-05-03 08:17:05 C 11 41 23.50 -14 45 24.1 V T05
2021-05-03 08:21:43 C 11 41 23.73 -14 45 18.9 V T05
2021-05-03 08:30:58 C 11 41 24.29 -14 45 10.3 V T05
2021-05-03 08:46:12 C 11 41 25.19 -14 44 56.8 V T05
2021-05-04 06:24:10 C 11 42 55.06 -14 26 09.7 V 703
2021-05-04 06:31:33 C 11 42 55.52 -14 26 03.2 V 703
2021-05-04 06:38:57 C 11 42 55.95 -14 25 57.1 V 703
2021-05-04 06:46:20 C 11 42 56.41 -14 25 50.6 V 703
2021-05-08 08:03:11 C 11 49 48.22 -13 09 04.2 V T05
2021-05-08 08:08:29 C 11 49 48.55 -13 08 59.9 V T05
2021-05-08 08:17:44 C 11 49 49.15 -13 08 53.6 V T05
2021-05-08 08:32:22 C 11 49 50.05 -13 08 42.5 V T05
2021-05-10 07:57:17 C 11 53 14.28 -12 35 54.8 V T08
2021-05-10 08:07:55 C 11 53 14.97 -12 35 47.7 V T08
2021-05-10 08:13:16 C 11 53 15.36 -12 35 44.3 V T08
2021-05-10 08:29:14 C 11 53 16.36 -12 35 33.3 V T08
2021-05-12 05:29:03 C 11 56 32.21 -12 07 11.4 V G96
2021-05-12 05:36:37 C 11 56 32.71 -12 07 06.7 V G96
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)