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
2021-03-16 18:34:06 s 1 -181348.67 7 +254879.85 370.0 C57
2021-03-16 18:44:06 S 10 38 55.488 -47 08 21.41 V C57
2021-03-16 18:44:06 s 1 -181537.94 7 +254365.95 2740.0 C57
2021-03-16 19:04:06 S 10 38 55.310 -47 07 40.30 V C57
2021-03-16 19:04:06 s 1 -181913.99 3 +253334.58 2800.0 C57
2021-03-16 19:14:06 S 10 38 55.380 -47 07 18.01 V C57
2021-03-16 19:14:06 s 1 -182100.76 2 +252817.11 470.0 C57
2021-03-16 19:24:06 S 10 38 55.178 -47 06 59.65 V C57
2021-03-16 19:24:06 s 1 -182286.69 0 +252298.46 6570.0 C57
2021-03-16 19:34:06 S 10 38 55.236 -47 06 40.07 V C57
2021-03-16 19:34:06 s 1 -182471.77 3 +251778.62 1090.0 C57
2021-03-16 19:44:06 S 10 38 55.142 -47 06 16.74 V C57
2021-03-16 19:44:06 s 1 -182656.01 0 +251257.58 4010.0 C57
2021-03-16 19:54:06 S 10 38 54.900 -47 06 00.65 V C57
2021-03-16 19:54:06 s 1 -182839.39 5 +250735.36 5340.0 C57
2021-03-16 20:04:06 S 10 38 54.907 -47 05 37.46 V C57
2021-03-16 20:04:06 s 1 -183021.92 6 +250211.94 5060.0 C57
2021-03-16 20:14:06 S 10 38 54.862 -47 05 14.28 V C57
2021-03-16 20:14:06 s 1 -183203.59 9 +249687.33 3180.0 C57
2021-03-16 20:24:06 S 10 38 54.686 -47 04 58.22 V C57
2021-03-16 20:24:06 s 1 -183384.41 1 +249161.53 9670.0 C57
2021-03-16 20:34:06 S 10 38 54.684 -47 04 34.90 V C57
2021-03-16 20:34:06 s 1 -183564.35 8 +248634.53 4540.0 C57
2021-03-16 20:44:06 S 10 38 54.785 -47 04 15.24 V C57
2021-03-16 20:44:06 s 1 -183743.43 7 +248106.33 7790.0 C57
2021-03-16 20:54:06 S 10 38 54.096 -47 03 56.59 V C57
2021-03-16 20:54:06 s 1 -183921.64 4 +247576.94 9390.0 C57
2021-03-16 21:14:06 S 10 38 54.370 -47 03 09.90 V C57
2021-03-16 21:14:06 s 1 -184275.43 0 +246514.55 7660.0 C57
2021-03-16 21:24:06 S 10 38 54.290 -47 02 50.42 V C57
2021-03-16 21:24:06 s 1 -184451.00 0 +245981.56 4320.0 C57
2021-03-16 21:34:06 S 10 38 54.430 -47 02 30.01 V C57
2021-03-16 21:34:06 s 1 -184625.68 5 +245447.36 9310.0 C57
2021-03-16 21:44:06 S 10 38 54.139 -47 02 08.99 V C57
2021-03-16 21:44:06 s 1 -184799.48 0 +244911.97 2630.0 C57
2021-03-16 21:54:06 S 10 38 54.118 -47 01 48.76 V C57
2021-03-16 21:54:06 s 1 -184972.38 3 +244375.37 4260.0 C57
2021-03-16 22:04:06 S 10 38 53.981 -47 01 27.19 V C57
2021-03-16 22:04:06 s 1 -185144.38 8 +243837.56 4220.0 C57
2021-03-16 22:14:06 S 10 38 54.197 -47 01 08.58 V C57
2021-03-16 22:14:06 s 1 -185315.49 2 +243298.55 2480.0 C57
2021-03-17 00:04:06 S 10 38 54.406 -46 57 18.61 V C57
2021-03-17 00:04:06 s 1 -187137.14 0 +237289.50 9630.0 C57
2021-03-17 00:14:06 S 10 38 53.107 -46 56 56.98 V C57
2021-03-17 00:14:06 s 1 -187297.14 6 +236735.93 7020.0 C57
2021-03-17 01:04:06 S 10 38 52.606 -46 55 12.47 V C57
2021-03-17 01:04:06 s 1 -188082.84 1 +233949.76 7020.0 C57
2021-03-17 01:14:06 S 10 38 52.301 -46 54 48.10 V C57
2021-03-17 01:14:06 s 1 -188237.08 6 +233388.85 3570.0 C57
2021-03-17 01:24:06 S 10 38 52.198 -46 54 27.29 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)