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
2021-06-21 02:09:17 S 13 11 56.80 -09 13 00.1 L C51
2021-06-21 03:43:21 S 13 12 04.76 -09 13 09.0 L C51
2021-06-21 06:51:40 S 13 12 20.37 -09 13 30.3 L C51
2021-06-21 09:59:49 S 13 12 36.17 -09 13 52.0 L C51
2021-06-21 13:08:07 S 13 12 51.98 -09 14 12.4 L C51
2021-06-21 16:16:15 S 13 13 07.74 -09 14 33.0 L C51
2021-06-21 19:24:35 S 13 13 23.54 -09 14 54.3 L C51
2021-06-21 22:32:53 S 13 13 39.288 -09 15 16.63 L C51
2024-10-01 11:48:47 C 07 27 36.007 +27 32 50.39 V G96
2024-10-01 11:55:37 C 07 27 37.426 +27 32 45.13 V G96
2024-10-01 12:02:28 C 07 27 38.873 +27 32 39.88 V G96
2024-10-01 12:09:18 C 07 27 40.298 +27 32 34.30 V G96
2024-10-15 11:32:04 C 08 37 07.507 +21 50 32.14 V G96
2024-10-15 11:39:32 C 08 37 08.936 +21 50 23.28 V G96
2024-10-15 11:46:59 C 08 37 10.348 +21 50 14.57 V G96
2024-10-15 11:54:27 C 08 37 11.834 +21 50 05.86 V G96
2025-01-06 15:11:20 C 13 56 16.998 -20 54 46.82 X F51
2025-01-06 15:18:54 C 13 56 18.044 -20 54 53.41 X F51
2025-01-06 15:26:32 C 13 56 19.102 -20 55 00.35 X F51
2025-01-06 15:34:08 C 13 56 20.149 -20 55 06.87 X F51
2025-02-05 14:56:32 C 15 35 34.586 -28 35 34.35 X F51
2025-02-05 15:05:20 C 15 35 35.706 -28 35 38.04 X F51
2025-02-05 15:14:05 C 15 35 36.827 -28 35 41.74 X F51
2025-02-05 15:22:49 C 15 35 37.953 -28 35 45.61 X F51
2025-06-19 00:12:23 C 16 56 21.696 -17 57 57.46 V R17
2025-06-19 00:32:02 C 16 56 19.927 -17 57 46.84 V R17
2025-06-19 00:51:42 C 16 56 18.115 -17 57 35.96 V R17
2025-06-19 01:11:21 C 16 56 16.354 -17 57 25.13 V R17
2025-06-22 00:09:26 C 16 50 31.682 -17 19 53.80 V R17
2025-06-22 00:29:06 C 16 50 30.043 -17 19 43.82 V R17
2025-06-22 00:48:46 C 16 50 28.418 -17 19 33.28 V R17
2025-06-22 01:08:26 C 16 50 26.796 -17 19 23.30 V R17
2025-06-23 05:56:27 C 16 48 15.763 -17 04 32.92 V W68
2025-06-23 06:03:10 C 16 48 15.226 -17 04 30.04 V W68
2025-06-23 06:12:45 C 16 48 14.407 -17 04 25.43 V W68
2025-06-23 06:19:40 C 16 48 13.817 -17 04 21.22 V W68
2025-06-23 22:40:39 C 16 47 02.635 -16 56 21.62 V M22
2025-06-23 22:48:34 C 16 47 02.026 -16 56 18.35 V M22
2025-06-23 22:49:13 C 16 47 01.975 -16 56 17.70 V M22
2025-06-23 22:55:05 C 16 47 01.505 -16 56 14.82 V M22
2025-06-23 22:56:44 C 16 47 01.402 -16 56 14.14 V M22
2025-06-27 04:08:02 C 16 41 48.840 -16 20 40.67 V W68
2025-06-27 04:12:40 C 16 41 48.562 -16 20 38.08 V W68
2025-06-27 04:52:57 C 16 41 45.754 -16 20 19.39 V W68
2025-06-27 05:49:07 C 16 41 41.983 -16 19 54.59 V W68
2025-06-29 21:03:08 C 16 38 00.187 -15 53 39.73 V M22
2025-06-29 21:07:06 C 16 38 00.002 -15 53 38.62 V M22
2025-06-29 21:16:56 C 16 37 59.273 -15 53 34.51 V M22
2025-06-29 21:40:11 C 16 37 57.905 -15 53 26.34 V M22
2025-07-01 23:00:02 C 16 35 25.922 -15 35 09.56 V R17
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)