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
2016-07-06 07:53:53 C 20 23 17.30 -06 32 00.0 o 691
2016-07-06 07:56:39 C 20 23 17.11 -06 31 59.1 o 691
2016-07-06 07:59:25 C 20 23 16.87 -06 31 57.5 o 691
2016-07-06 11:30:02 C 20 23 00.66 -06 30 48.7 L T05
2016-07-06 11:48:52 C 20 22 59.15 -06 30 42.3 L T05
2016-07-06 12:07:56 C 20 22 57.61 -06 30 36.5 L T05
2016-07-06 12:26:55 C 20 22 55.99 -06 30 31.1 L T05
2016-07-09 11:32:34 C 20 17 16.253 -06 09 52.47 L F51
2016-07-09 11:50:17 C 20 17 14.684 -06 09 47.63 L F51
2016-07-09 12:07:58 C 20 17 13.119 -06 09 42.81 L F51
2016-07-09 12:25:37 C 20 17 11.556 -06 09 37.99 L F51
2016-07-10 15:07:18 C 20 14 57.58 -06 02 39.8 q Q21
2016-07-10 15:14:54 C 20 14 56.92 -06 02 38.1 q Q21
2016-07-10 15:28:34 C 20 14 55.70 -06 02 33.9 q Q21
2016-07-14 06:10:03 C 20 07 18.84 -05 42 26.4 q G96
2016-07-14 06:17:48 C 20 07 18.11 -05 42 25.4 q G96
2016-07-14 06:25:34 C 20 07 17.36 -05 42 23.0 q G96
2016-07-20 22:57:18 C 19 52 15.31 -05 17 05.6 q 160
2016-07-20 22:59:54 C 19 52 15.01 -05 17 05.3 q 160
2016-07-20 23:02:30 C 19 52 14.80 -05 17 05.4 q 160
2016-07-27 13:05:16 C 19 37 18.91 -05 07 44.4 o 300
2016-07-27 13:08:36 C 19 37 18.58 -05 07 44.9 o 300
2016-07-27 13:11:55 C 19 37 18.23 -05 07 44.5 o 300
2016-07-27 13:15:16 C 19 37 17.88 -05 07 44.7 o 300
2016-07-27 13:51:49 C 19 37 14.35 -05 07 44.9 o 300
2016-07-27 13:55:09 C 19 37 14.00 -05 07 44.6 o 300
2016-07-27 14:01:47 C 19 37 13.38 -05 07 44.6 o 300
2016-07-27 14:08:27 C 19 37 12.74 -05 07 45.1 o 300
2016-07-27 14:14:55 C 19 37 12.05 -05 07 43.9 o 300
2016-07-27 14:18:14 C 19 37 11.72 -05 07 43.8 o 300
2016-07-27 14:21:33 C 19 37 11.41 -05 07 44.0 o 300
2016-07-27 14:24:53 C 19 37 11.15 -05 07 44.1 o 300
2016-07-27 14:28:12 C 19 37 10.77 -05 07 44.7 o 300
2016-07-27 14:34:51 C 19 37 10.13 -05 07 44.4 o 300
2016-07-27 14:58:10 C 19 37 07.85 -05 07 43.9 o 300
2016-07-27 14:58:12 C 19 37 08.28 -05 07 45.0 q D29
2016-07-27 15:08:10 C 19 37 06.90 -05 07 44.5 o 300
2016-07-27 15:11:30 C 19 37 06.56 -05 07 44.7 o 300
2016-07-27 15:18:08 C 19 37 05.90 -05 07 44.3 o 300
2016-07-27 15:18:34 C 19 37 06.18 -05 07 43.5 q D29
2016-07-27 15:38:56 C 19 37 04.19 -05 07 43.0 q D29
2016-07-28 20:58:19 C 19 34 23.92 -05 07 44.7 S G36
2016-07-28 23:40:59 C 19 34 08.37 -05 07 46.5 S G36
2016-07-29 02:12:46 C 19 33 53.92 -05 07 47.8 S G36
2016-07-29 20:46:51 C 19 32 15.20 -05 08 07.3 S G36
2016-07-29 23:13:09 C 19 32 01.43 -05 08 11.1 S G36
2016-07-30 01:50:06 C 19 31 46.69 -05 08 14.6 S G36
2016-07-30 20:44:56 C 19 30 07.67 -05 08 50.2 S G36
2016-07-30 22:08:45 C 19 29 59.92 -05 08 53.4 S G36
2016-07-30 22:50:32 C 19 29 56.04 -05 08 55.0 S G36
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)