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
1999-07-03 12:18:25 C 14 52 13.73 -13 37 56.1 426
1999-07-03 12:27:24 C 14 52 13.98 -13 37 55.6 426
2003-05-25 10:41:46 C 20 05 35.78 -17 21 33.5 d 291
2003-05-25 10:47:53 C 20 05 35.75 -17 21 30.1 d 291
2003-05-25 10:53:37 C 20 05 35.73 -17 21 27.9 d 291
2003-06-28 07:07:41 C 19 29 52.68 -11 53 11.8 18.3 c 704
2003-06-28 07:22:15 C 19 29 51.38 -11 53 05.4 19.1 c 704
2003-06-28 07:36:35 C 19 29 49.90 -11 53 01.5 19.1 c 704
2003-06-28 07:51:13 C 19 29 48.59 -11 52 57.9 19.1 c 704
2003-06-28 08:05:34 C 19 29 47.22 -11 52 52.5 19.2 c 704
2003-08-07 03:36:03 C 18 14 21.39 -09 48 15.8 c 807
2003-11-20 02:21:03 C 20 53 08.95 -10 30 17.3 d 291
2003-11-20 02:28:52 C 20 53 09.86 -10 30 16.6 d 291
2003-11-21 02:46:30 C 20 56 00.75 -10 23 07.2 d 291
2003-11-21 02:53:07 C 20 56 01.52 -10 23 04.7 d 291
2003-11-21 02:58:56 C 20 56 02.24 -10 23 03.7 d 291
2004-03-23 02:42:47 C 04 27 16.93 +15 20 55.8 o 696
2004-03-23 02:50:11 C 04 27 18.37 +15 20 57.7 o 696
2004-04-15 03:16:49 C 06 14 21.84 +15 59 06.6 o 696
2004-04-15 03:22:17 C 06 14 22.89 +15 59 06.1 o 696
2007-06-18 09:24:51 C 22 38 04.32 -00 01 35.4 o 291
2007-06-18 09:44:28 C 22 38 05.37 -00 01 20.5 o 291
2007-06-18 10:03:48 C 22 38 06.39 -00 01 06.2 o 291
2007-08-03 21:23:50 C 23 07 15.46 +14 01 45.1 o 151
2007-08-03 21:28:12 C 23 07 15.33 +14 01 49.3 o 151
2007-08-09 15:32:52 C 23 04 01.94 +15 33 31.2 m 300
2007-08-09 15:48:01 C 23 04 01.40 +15 33 40.5 m 300
2007-08-09 16:13:32 C 23 04 00.46 +15 33 57.0 m 300
2007-08-09 16:35:06 C 23 03 59.66 +15 34 10.5 m 300
2007-08-09 16:59:56 C 23 03 58.76 +15 34 26.2 m 300
2007-08-10 13:36:17 C 23 03 19.79 +15 47 15.0 m 300
2007-08-10 13:56:26 C 23 03 19.09 +15 47 28.5 m 300
2007-08-10 16:08:11 C 23 03 13.98 +15 48 51.6 m 300
2007-08-10 16:16:50 C 23 03 13.65 +15 48 56.8 m 300
2007-08-10 16:23:19 C 23 03 13.40 +15 49 01.1 m 300
2007-08-11 18:12:46 C 23 02 18.13 +16 04 44.2 m 300
2007-08-11 18:14:57 C 23 02 17.97 +16 04 45.4 m 300
2007-08-11 18:17:08 C 23 02 17.92 +16 04 46.4 m 300
2007-08-11 23:56:31 C 23 02 06.15 +16 08 04.9 o 151
2007-08-11 23:57:37 C 23 02 06.11 +16 08 05.8 o 151
2007-08-11 23:58:43 C 23 02 06.06 +16 08 06.6 o 151
2007-08-11 23:59:48 C 23 02 06.00 +16 08 07.1 o 151
2007-08-12 00:00:54 C 23 02 05.96 +16 08 08.4 o 151
2007-08-12 00:01:59 C 23 02 05.90 +16 08 08.5 o 151
2007-08-12 00:03:04 C 23 02 05.83 +16 08 08.8 o 151
2007-08-12 14:58:49 C 23 01 31.70 +16 17 05.1 m 355
2007-08-12 15:08:47 C 23 01 31.23 +16 17 10.7 m 355
2007-08-12 15:17:05 C 23 01 30.87 +16 17 15.6 m 355
2007-08-12 15:28:42 C 23 01 30.35 +16 17 23.0 m 355
2007-08-14 16:24:00 C 22 59 26.40 +16 45 17.4 m 355
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)