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
2021-03-13 06:04:06 s 1 -24143.702 0 +377350.99 6420.0 C57
2021-03-13 06:14:06 S 10 37 55.234 -49 45 45.07 V C57
2021-03-13 06:14:06 s 1 -24513.472 0 +377366.19 1120.0 C57
2021-03-13 06:24:06 S 10 37 55.370 -49 45 28.44 V C57
2021-03-13 06:24:06 s 1 -24883.188 0 +377380.38 5790.0 C57
2021-03-13 06:34:06 S 10 37 55.814 -49 45 12.20 V C57
2021-03-13 06:34:06 s 1 -25252.848 0 +377393.56 420.0 C57
2021-03-13 06:44:06 S 10 37 56.273 -49 44 54.78 V C57
2021-03-13 06:44:06 s 1 -25622.451 0 +377405.73 5010.0 C57
2021-03-13 06:54:06 S 10 37 56.364 -49 44 40.38 V C57
2021-03-13 06:54:06 s 1 -25991.996 0 +377416.89 9570.0 C57
2021-03-13 07:04:06 S 10 37 57.000 -49 44 20.76 V C57
2021-03-13 07:04:06 s 1 -26361.483 0 +377427.05 4080.0 C57
2021-03-13 07:54:06 S 10 37 58.454 -49 42 55.62 V C57
2021-03-13 07:54:06 s 1 -28208.006 0 +377462.73 5930.0 C57
2021-03-13 08:14:06 S 10 37 58.918 -49 42 20.23 V C57
2021-03-13 08:14:06 s 1 -28946.172 0 +377469.96 4300.0 C57
2021-03-13 08:24:06 S 10 37 59.590 -49 42 03.82 V C57
2021-03-13 08:24:06 s 1 -29315.156 0 +377472.06 8400.0 C57
2021-03-13 08:34:06 S 10 37 59.837 -49 41 47.36 V C57
2021-03-13 08:34:06 s 1 -29684.073 0 +377473.16 2450.0 C57
2021-03-13 08:44:06 S 10 37 59.695 -49 41 32.24 V C57
2021-03-13 08:44:06 s 1 -30052.922 0 +377473.26 6430.0 C57
2021-03-13 08:54:06 S 10 37 59.993 -49 41 12.73 V C57
2021-03-13 08:54:06 s 1 -30421.701 0 +377472.35 340.0 C57
2021-03-13 09:04:06 S 10 38 00.794 -49 40 54.23 V C57
2021-03-13 09:04:06 s 1 -30790.411 0 +377470.43 4190.0 C57
2021-03-13 09:14:06 S 10 38 00.559 -49 40 39.11 V C57
2021-03-13 09:14:06 s 1 -31159.050 0 +377467.51 7970.0 C57
2021-03-13 09:24:06 S 10 38 01.001 -49 40 20.86 V C57
2021-03-13 09:24:06 s 1 -31527.616 0 +377463.59 1690.0 C57
2021-03-13 09:34:06 S 10 38 01.646 -49 40 07.03 V C57
2021-03-13 09:34:06 s 1 -31896.110 0 +377458.66 5330.0 C57
2021-03-13 09:44:06 S 10 38 01.608 -49 39 48.02 V C57
2021-03-13 09:44:06 s 1 -32264.530 0 +377452.72 8890.0 C57
2021-03-13 09:54:06 S 10 38 02.299 -49 39 28.80 V C57
2021-03-13 09:54:06 s 1 -32632.876 0 +377445.79 2380.0 C57
2021-03-13 10:04:06 S 10 38 02.462 -49 39 13.54 V C57
2021-03-13 10:04:06 s 1 -33001.145 0 +377437.85 5800.0 C57
2021-03-13 10:14:06 S 10 38 02.897 -49 38 56.47 V C57
2021-03-13 10:14:06 s 1 -33369.338 0 +377428.90 9130.0 C57
2021-03-13 10:24:06 S 10 38 02.770 -49 38 37.54 V C57
2021-03-13 10:24:06 s 1 -33737.454 0 +377418.96 2380.0 C57
2021-03-13 10:34:06 S 10 38 03.365 -49 38 22.34 V C57
2021-03-13 10:34:06 s 1 -34105.490 0 +377408.01 5550.0 C57
2021-03-13 10:44:06 S 10 38 03.706 -49 38 05.96 V C57
2021-03-13 10:44:06 s 1 -34473.448 0 +377396.05 8640.0 C57
2021-03-13 10:54:06 S 10 38 03.862 -49 37 47.21 V C57
2021-03-13 10:54:06 s 1 -34841.324 0 +377383.10 1630.0 C57
2021-03-13 11:14:06 S 10 38 04.608 -49 37 12.68 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)