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
2021-03-09 23:34:05 s 1 +135175.10 1 +247075.04 5450.0 C57
2021-03-09 23:44:05 S 10 33 08.438 -51 51 57.96 V C57
2021-03-09 23:44:05 s 1 +134932.81 0 +247653.16 590.0 C57
2021-03-09 23:54:05 S 10 33 09.646 -51 51 40.14 V C57
2021-03-09 23:54:05 s 1 +134689.66 5 +248229.72 3910.0 C57
2021-03-10 00:04:05 S 10 33 10.414 -51 51 24.23 V C57
2021-03-10 00:04:05 s 1 +134445.67 1 +248804.71 5420.0 C57
2021-03-10 00:24:05 S 10 33 12.389 -51 50 51.07 V C57
2021-03-10 00:24:05 s 1 +133955.15 3 +249950.04 3030.0 C57
2021-03-10 00:34:05 S 10 33 13.394 -51 50 36.42 V C57
2021-03-10 00:34:05 s 1 +133708.64 0 +250520.37 9150.0 C57
2021-03-10 00:44:05 S 10 33 14.239 -51 50 22.78 V C57
2021-03-10 00:44:05 s 1 +133461.29 7 +251089.16 3490.0 C57
2021-03-10 00:54:05 S 10 33 15.374 -51 50 09.17 V C57
2021-03-10 00:54:05 s 1 +133213.12 8 +251656.40 6070.0 C57
2021-03-10 01:04:05 S 10 33 16.440 -51 49 50.27 V C57
2021-03-10 01:04:05 s 1 +132964.14 0 +252222.09 6890.0 C57
2021-03-10 01:14:05 S 10 33 17.306 -51 49 34.75 V C57
2021-03-10 01:14:05 s 1 +132714.33 5 +252786.25 5970.0 C57
2021-03-10 01:24:05 S 10 33 17.926 -51 49 19.96 V C57
2021-03-10 01:24:05 s 1 +132463.72 0 +253348.86 3310.0 C57
2021-03-10 01:34:05 S 10 33 19.303 -51 49 03.36 V C57
2021-03-10 01:34:05 s 1 +132212.29 8 +253909.94 8920.0 C57
2021-03-10 01:44:05 S 10 33 20.299 -51 48 49.64 V C57
2021-03-10 01:44:05 s 1 +131960.07 5 +254469.49 2810.0 C57
2021-03-10 01:54:05 S 10 33 20.791 -51 48 33.44 V C57
2021-03-10 01:54:05 s 1 +131707.05 4 +255027.50 4990.0 C57
2021-03-10 02:04:05 S 10 33 21.768 -51 48 17.35 V C57
2021-03-10 02:04:05 s 1 +131453.24 1 +255583.99 5470.0 C57
2021-03-10 02:14:05 S 10 33 23.021 -51 48 03.74 V C57
2021-03-10 02:14:05 s 1 +131198.64 0 +256138.96 4260.0 C57
2021-03-10 02:24:05 S 10 33 23.969 -51 47 46.82 V C57
2021-03-10 02:24:05 s 1 +130943.25 5 +256692.39 1370.0 C57
2021-03-10 02:34:05 S 10 33 24.926 -51 47 30.66 V C57
2021-03-10 02:34:05 s 1 +130687.09 2 +257244.31 6800.0 C57
2021-03-10 02:44:05 S 10 33 25.862 -51 47 16.15 V C57
2021-03-10 02:44:05 s 1 +130430.15 4 +257794.72 570.0 C57
2021-03-10 02:54:05 S 10 33 26.736 -51 47 03.44 V C57
2021-03-10 02:54:05 s 1 +130172.44 6 +258343.60 2690.0 C57
2021-03-10 03:04:05 S 10 33 27.744 -51 46 46.56 V C57
2021-03-10 03:04:05 s 1 +129913.97 2 +258890.97 3160.0 C57
2021-03-10 03:14:05 S 10 33 28.651 -51 46 29.93 V C57
2021-03-10 03:14:05 s 1 +129654.73 7 +259436.84 1990.0 C57
2021-03-10 03:24:05 S 10 33 29.633 -51 46 13.76 V C57
2021-03-10 03:24:05 s 1 +129394.74 5 +259981.19 9190.0 C57
2021-03-10 03:34:05 S 10 33 30.463 -51 45 59.40 V C57
2021-03-10 03:34:05 s 1 +129134.00 0 +260524.04 4770.0 C57
2021-03-10 03:44:05 S 10 33 31.243 -51 45 41.76 V C57
2021-03-10 03:44:05 s 1 +128872.50 6 +261065.39 8740.0 C57
2021-03-10 03:54:05 S 10 33 32.093 -51 45 22.43 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)