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
2021-01-23 09:44:07 S 05 11 28.966 -78 42 29.77 V C57
2021-01-23 09:44:07 s 1 -175742.10 2 +290837.42 7820.0 C57
2021-01-23 09:54:07 S 05 11 39.252 -78 42 20.74 V C57
2021-01-23 09:54:07 s 1 -175942.16 8 +290392.63 7490.0 C57
2021-01-23 10:04:07 S 05 11 48.221 -78 42 18.25 V C57
2021-01-23 10:04:07 s 1 -176141.59 7 +289946.80 6050.0 C57
2021-01-23 10:14:07 S 05 11 57.720 -78 42 13.64 V C57
2021-01-23 10:14:07 s 1 -176340.38 7 +289499.91 3520.0 C57
2021-01-23 10:24:08 S 05 12 07.798 -78 42 12.49 V C57
2021-01-23 10:24:08 s 1 -176538.53 4 +289051.97 9880.0 C57
2021-01-23 10:34:07 S 05 12 16.723 -78 42 05.90 V C57
2021-01-23 10:34:07 s 1 -176736.03 7 +288602.97 5120.0 C57
2021-01-23 11:04:07 S 05 12 45.410 -78 41 52.87 V C57
2021-01-23 11:04:07 s 1 -177324.65 8 +287249.64 4170.0 C57
2021-01-23 11:24:07 S 05 13 04.092 -78 41 41.71 V C57
2021-01-23 11:24:07 s 1 -177713.80 8 +286342.13 4570.0 C57
2021-01-23 11:34:07 S 05 13 13.342 -78 41 36.96 V C57
2021-01-23 11:34:07 s 1 -177907.39 7 +285886.79 3070.0 C57
2021-01-23 11:44:07 S 05 13 23.090 -78 41 35.99 V C57
2021-01-23 11:44:07 s 1 -178100.32 5 +285430.38 430.0 C57
2021-01-23 11:54:08 S 05 13 32.909 -78 41 26.05 V C57
2021-01-23 11:54:08 s 1 -178292.58 9 +284972.92 6640.0 C57
2021-01-23 12:04:07 S 05 13 41.410 -78 41 25.91 V C57
2021-01-23 12:04:07 s 1 -178484.18 9 +284514.39 1710.0 C57
2021-01-23 12:14:08 S 05 13 52.133 -78 41 23.14 V C57
2021-01-23 12:14:08 s 1 -178675.12 0 +284054.80 5630.0 C57
2021-01-23 12:24:07 S 05 14 01.426 -78 41 16.01 V C57
2021-01-23 12:24:07 s 1 -178865.38 1 +283594.14 8390.0 C57
2021-01-23 12:34:07 S 05 14 10.704 -78 41 12.37 V C57
2021-01-23 12:34:07 s 1 -179054.97 0 +283132.42 9990.0 C57
2021-01-23 12:44:07 S 05 14 20.086 -78 41 09.02 V C57
2021-01-23 12:44:07 s 1 -179243.88 3 +282669.63 420.0 C57
2021-01-23 12:54:07 S 05 14 29.750 -78 41 01.28 V C57
2021-01-23 12:54:07 s 1 -179432.11 8 +282205.77 9690.0 C57
2021-01-23 13:14:07 S 05 14 48.197 -78 40 50.66 V C57
2021-01-23 13:14:07 s 1 -179806.54 6 +281274.85 4690.0 C57
2021-01-23 13:24:08 S 05 14 58.716 -78 40 48.72 V C57
2021-01-23 13:24:08 s 1 -179992.73 4 +280807.78 430.0 C57
2021-01-23 13:34:07 S 05 15 07.387 -78 40 40.73 V C57
2021-01-23 13:34:07 s 1 -180178.23 4 +280339.64 4970.0 C57
2021-01-23 13:44:08 S 05 15 17.239 -78 40 36.44 V C57
2021-01-23 13:44:08 s 1 -180363.04 3 +279870.43 8320.0 C57
2021-01-23 15:14:07 S 05 16 44.417 -78 39 53.42 V C57
2021-01-23 15:14:07 s 1 -181994.85 2 +275599.13 4130.0 C57
2021-01-23 15:24:07 S 05 16 53.261 -78 39 45.22 V C57
2021-01-23 15:24:07 s 1 -182172.61 9 +275119.14 5310.0 C57
2021-01-23 15:44:07 S 05 17 12.125 -78 39 34.24 V C57
2021-01-23 15:44:07 s 1 -182525.99 5 +274155.91 3960.0 C57
2021-01-23 15:54:07 S 05 17 22.219 -78 39 29.70 V C57
2021-01-23 15:54:07 s 1 -182701.59 8 +273672.67 1400.0 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)