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
2008-01-01 02:54:08 C 00 10 13.90 -06 43 14.4 r 703
2008-01-01 03:03:27 C 00 10 15.27 -06 43 21.0 r 703
2008-01-27 10:38:53 C 02 07 21.76 -11 59 42.0 o 300
2008-01-27 10:44:21 C 02 07 22.82 -11 59 44.6 o 300
2008-01-27 10:49:44 C 02 07 24.02 -11 59 47.4 o 300
2008-01-27 11:05:46 C 02 07 27.23 -11 59 55.3 o 300
2008-01-27 11:26:38 C 02 07 31.40 -12 00 05.9 o 300
2008-01-30 03:28:56 C 02 21 19.83 -12 32 54.7 r 448
2008-01-30 03:34:03 C 02 21 20.98 -12 32 58.1 r 448
2008-01-30 03:39:10 C 02 21 21.97 -12 33 00.3 r 448
2008-01-30 03:44:16 C 02 21 23.06 -12 33 02.9 r 448
2008-02-02 01:47:21 C 02 36 56.53 -13 07 32.3 r 448
2008-02-02 01:54:35 C 02 36 58.08 -13 07 34.9 r 448
2008-02-02 02:01:45 C 02 36 59.61 -13 07 38.3 r 448
2008-02-02 18:51:26 C 02 40 47.46 -13 15 44.8 r A13
2008-02-02 19:28:44 C 02 40 55.55 -13 16 01.7 r A13
2008-03-07 02:31:55 C 06 00 16.80 -14 45 54.5 18.3 c 704
2008-03-07 02:47:51 C 06 00 20.59 -14 45 48.5 18.7 c 704
2008-03-07 03:04:39 C 06 00 24.63 -14 45 42.3 18.4 c 704
2008-03-07 03:20:25 C 06 00 28.37 -14 45 37.6 18.7 c 704
2008-03-07 03:36:21 C 06 00 32.14 -14 45 30.8 18.7 c 704
2008-03-12 00:38:00 C 06 29 35.02 -13 58 02.2 o 809
2008-03-12 00:40:14 C 06 29 35.54 -13 58 01.1 o 809
2008-03-12 00:42:46 C 06 29 36.11 -13 58 00.0 o 809
2008-03-12 00:45:07 C 06 29 36.67 -13 57 58.9 o 809
2008-03-12 00:47:43 C 06 29 37.27 -13 57 57.7 o 809
2008-03-12 00:50:31 C 06 29 37.93 -13 57 56.4 o 809
2008-03-12 00:52:52 C 06 29 38.46 -13 57 55.4 o 809
2008-03-13 00:56:13 C 06 35 29.61 -13 46 54.1 o 809
2008-03-13 00:58:21 C 06 35 30.11 -13 46 53.1 o 809
2008-03-13 01:00:36 C 06 35 30.62 -13 46 52.0 o 809
2008-03-13 01:05:41 C 06 35 31.79 -13 46 49.5 o 809
2008-03-13 01:10:13 C 06 35 32.85 -13 46 47.4 o 809
2008-03-13 01:12:27 C 06 35 33.35 -13 46 46.3 o 809
2008-03-13 01:14:49 C 06 35 33.89 -13 46 45.2 o 809
2008-03-13 01:17:09 C 06 35 34.43 -13 46 44.0 o 809
2008-04-09 03:32:55 C 08 52 30.36 -07 51 54.8 r 703
2008-04-09 03:41:29 C 08 52 31.80 -07 51 49.7 r 703
2008-04-09 03:49:58 C 08 52 33.24 -07 51 46.0 r 703
2008-04-09 03:58:28 C 08 52 34.68 -07 51 41.6 r 703
2008-04-27 03:56:25 C 10 01 53.32 -05 11 23.2 r 703
2008-04-27 04:07:34 C 10 01 54.84 -05 11 21.6 r 703
2008-04-27 04:18:40 C 10 01 56.38 -05 11 17.4 r 703
2008-04-27 04:29:48 C 10 01 57.90 -05 11 16.0 r 703
2008-05-03 04:13:33 C 10 22 07.93 -04 42 17.9 r 703
2008-05-03 04:24:21 C 10 22 09.30 -04 42 15.8 r 703
2008-05-03 04:35:10 C 10 22 10.77 -04 42 15.3 r 703
2008-05-03 04:45:54 C 10 22 12.14 -04 42 12.2 r 703
2011-08-22 19:06:35 C 03 36 50.17 +30 11 17.4 c D35
2011-08-22 19:09:53 C 03 36 50.70 +30 11 19.4 c D35
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)