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
2021-04-01 05:54:05 S 10 54 00.470 -33 58 44.36 V C57
2021-04-01 05:54:05 s 1 -139572.51 5 -13719.043 690.0 C57
2021-04-01 06:44:05 S 10 54 01.006 -33 56 38.47 V C57
2021-04-01 06:44:05 s 1 -135993.08 4 -18436.322 4400.0 C57
2021-04-01 08:34:05 S 10 54 01.870 -33 51 55.44 V C57
2021-04-01 08:34:05 s 1 -127479.54 1 -28717.615 7350.0 C57
2021-04-03 08:43:35 C 10 57 14.25 -32 06 02.2 V T08
2021-04-03 08:51:34 C 10 57 14.55 -32 05 46.9 V T08
2021-04-03 09:02:51 C 10 57 14.96 -32 05 24.6 V T08
2021-04-03 09:07:33 C 10 57 15.12 -32 05 15.2 V T08
2021-04-03 11:42:17 C 10 57 22.90 -31 59 27.3 q E89
2021-04-03 11:53:59 C 10 57 23.30 -31 59 04.8 q E89
2021-04-07 08:12:09 C 11 02 21.93 -29 04 15.2 V T08
2021-04-07 08:17:30 C 11 02 22.15 -29 04 05.0 V T08
2021-04-07 08:25:28 C 11 02 22.46 -29 03 50.5 V T08
2021-04-07 09:14:35 C 11 02 24.42 -29 02 19.0 V T08
2021-04-07 10:11:00 C 11 02 26.68 -29 00 32.9 V T08
2021-04-07 10:15:01 C 11 02 26.90 -29 00 25.2 V T08
2021-04-07 10:25:08 C 11 02 27.31 -29 00 06.3 V T08
2021-04-10 05:29:35 C 11 06 12.64 -26 59 13.3 V 703
2021-04-10 05:37:24 C 11 06 12.97 -26 59 00.1 V 703
2021-04-10 05:45:13 C 11 06 13.34 -26 58 46.0 V 703
2021-04-10 05:53:01 C 11 06 13.66 -26 58 32.2 V 703
2021-04-11 08:52:14 C 11 07 45.60 -26 11 28.4 V T08
2021-04-11 08:56:53 C 11 07 45.80 -26 11 20.4 V T08
2021-04-11 09:05:31 C 11 07 46.18 -26 11 05.3 V T08
2021-04-11 09:44:33 C 11 07 47.91 -26 09 57.3 V T08
2021-04-14 00:31:33 C 11 11 28.60 -24 24 18.4 q 834
2021-04-14 01:10:39 C 11 11 30.48 -24 23 16.5 q 834
2021-04-15 08:34:59 C 11 13 21.61 -23 33 39.2 V T08
2021-04-15 08:39:38 C 11 13 21.82 -23 33 32.1 V T08
2021-04-15 08:48:54 C 11 13 22.26 -23 33 17.3 V T08
2021-04-15 09:03:30 C 11 13 22.97 -23 32 54.1 V T08
2021-04-17 08:16:24 C 11 16 14.78 -22 20 24.7 V T05
2021-04-17 08:26:56 C 11 16 15.29 -22 20 08.4 V T05
2021-04-17 08:31:34 C 11 16 15.52 -22 20 01.5 V T05
2021-04-17 08:39:28 C 11 16 15.91 -22 19 49.5 V T05
2021-04-17 08:46:03 C 11 16 16.26 -22 19 40.0 V T05
2021-04-17 08:55:16 C 11 16 16.70 -22 19 25.6 V T05
2021-04-19 08:32:25 C 11 19 13.28 -21 10 01.7 V T08
2021-04-19 08:37:44 C 11 19 13.54 -21 09 54.1 V T08
2021-04-19 08:45:05 C 11 19 13.91 -21 09 43.7 V T08
2021-04-19 09:00:23 C 11 19 14.71 -21 09 21.8 V T08
2021-04-20 04:53:43 C 11 20 30.17 -20 41 36.9 V G96
2021-04-20 05:01:08 C 11 20 30.56 -20 41 26.7 V G96
2021-04-20 05:08:35 C 11 20 30.96 -20 41 16.2 V G96
2021-04-20 05:16:02 C 11 20 31.34 -20 41 05.9 V G96
2021-04-21 13:00:20 C 11 22 31.65 -19 58 02.4 q Q11
2021-04-21 13:16:45 C 11 22 32.55 -19 57 40.4 q Q11
2021-04-21 13:33:15 C 11 22 33.45 -19 57 18.2 q Q11
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)