IAA RAS IAA Minor Planet Database

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
2021-01-30 00:34:07 S 07 50 47.669 -76 51 38.27 – V C57
2021-01-30 00:34:07 s 1 +125632.71 2 +266542.67 6400.0 – C57
2021-01-30 00:44:07 S 07 50 53.654 -76 51 34.34 – V C57
2021-01-30 00:44:07 s 1 +125381.14 3 +267088.60 7010.0 – C57
2021-01-30 00:54:07 S 07 50 59.582 -76 51 33.62 – V C57
2021-01-30 00:54:07 s 1 +125128.87 8 +267633.03 6320.0 – C57
2021-02-03 12:57:23 S 08 27 14.65 -73 58 59.9 – L C51
2021-02-03 14:31:38 S 08 27 52.27 -73 56 58.7 – L C51
2021-02-03 16:05:42 S 08 28 29.41 -73 54 56.7 – L C51
2021-02-03 17:39:46 S 08 29 06.281 -73 52 54.66 – L C51
2021-02-03 17:39:57 S 08 29 06.607 -73 52 55.24 – L C51
2021-02-03 19:14:01 S 08 29 43.29 -73 50 52.8 – L C51
2021-02-03 20:48:05 S 08 30 19.718 -73 48 50.18 – L C51
2021-02-03 22:22:21 S 08 30 56.32 -73 46 47.9 – L C51
2021-02-03 23:56:24 S 08 31 32.36 -73 44 45.1 – L C51
2021-02-04 01:30:28 S 08 32 08.19 -73 42 41.6 – L C51
2021-02-04 06:12:51 S 08 33 54.73 -73 36 31.3 – L C51
2021-02-04 06:13:02 S 08 33 55.02 -73 36 31.8 – L C51
2021-02-04 21:55:00 S 08 39 38.150 -73 15 46.44 – L C51
2021-02-04 23:29:04 S 08 40 11.206 -73 13 40.55 – L C51
2021-02-05 04:11:38 S 08 41 49.745 -73 07 22.66 – L C51
2021-03-08 04:14:05 S 10 27 11.652 -53 02 47.72 – V C57
2021-03-08 04:14:05 s 1 +141385.94 7 +34747.962 7330.0 – C57
2021-03-08 05:24:05 S 10 27 25.306 -53 00 39.74 – V C57
2021-03-08 05:24:05 s 1 +144020.44 6 +42223.476 3040.0 – C57
2021-03-08 05:44:05 S 10 27 28.646 -52 59 58.20 – V C57
2021-03-08 05:44:05 s 1 +144720.06 0 +44344.365 6980.0 – C57
2021-03-08 05:54:05 S 10 27 30.343 -52 59 41.57 – V C57
2021-03-08 05:54:05 s 1 +145061.31 3 +45402.206 7040.0 – C57
2021-03-08 06:14:05 S 10 27 33.742 -52 59 10.43 – V C57
2021-03-08 06:14:05 s 1 +145726.99 9 +47512.582 3890.0 – C57
2021-03-08 06:24:05 S 10 27 35.856 -52 58 45.26 – V C57
2021-03-08 06:24:05 s 1 +146051.54 4 +48565.081 900.0 – C57
2021-03-08 06:44:05 S 10 27 39.050 -52 58 10.38 – V C57
2021-03-08 06:44:05 s 1 +146684.31 3 +50664.614 2610.0 – C57
2021-03-08 08:14:05 S 10 27 55.742 -52 55 29.32 – V C57
2021-03-08 08:14:05 s 1 +149272.96 4 +60019.320 7280.0 – C57
2021-03-08 08:44:05 S 10 28 00.979 -52 54 33.16 – V C57
2021-03-08 08:44:05 s 1 +150045.97 8 +63102.561 420.0 – C57
2021-03-08 09:04:05 S 10 28 04.150 -52 54 02.74 – V C57
2021-03-08 09:04:05 s 1 +150537.47 8 +65148.074 1780.0 – C57
2021-03-08 09:24:05 S 10 28 07.908 -52 53 20.15 – V C57
2021-03-08 09:24:05 s 1 +151010.33 3 +67185.514 6050.0 – C57
2021-03-08 09:34:05 S 10 28 09.864 -52 53 05.75 – V C57
2021-03-08 09:34:05 s 1 +151239.87 9 +68201.185 4480.0 – C57
2021-03-08 09:44:05 S 10 28 11.369 -52 52 47.46 – V C57
2021-03-08 09:44:05 s 1 +151464.89 7 +69214.814 3900.0 – C57
2021-03-08 09:54:05 S 10 28 12.910 -52 52 32.63 – V C57
2021-03-08 09:54:05 s 1 +151685.42 9 +70226.392 4380.0 – C57
2021-03-08 10:04:05 S 10 28 14.822 -52 52 12.72 – V C57
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)