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
2020-12-30 04:52:53 C 00 16 48.43 -46 39 15.3 V T05
2020-12-30 04:53:33 C 00 16 48.58 -46 39 19.1 V T05
2020-12-30 04:58:10 C 00 16 49.28 -46 39 42.2 V T05
2020-12-30 04:58:49 C 00 16 49.43 -46 39 45.1 V T05
2020-12-30 05:06:05 C 00 16 50.54 -46 40 22.1 V T05
2020-12-30 05:06:45 C 00 16 50.70 -46 40 25.0 V T05
2020-12-30 05:24:00 C 00 16 53.39 -46 41 52.1 V T05
2020-12-30 05:24:39 C 00 16 53.52 -46 41 55.7 V T05
2021-01-22 15:44:07 S 04 54 26.878 -78 46 55.74 V C57
2021-01-22 15:44:07 s 1 -150823.22 0 +332858.01 6780.0 C57
2021-01-22 16:04:07 S 04 54 45.684 -78 46 52.97 V C57
2021-01-22 16:04:07 s 1 -151337.41 0 +332185.45 1680.0 C57
2021-01-22 16:14:08 S 04 54 55.037 -78 46 51.89 V C57
2021-01-22 16:14:08 s 1 -151593.84 5 +331847.71 8010.0 C57
2021-01-22 16:24:08 S 04 55 04.759 -78 46 52.07 V C57
2021-01-22 16:24:08 s 1 -151849.83 9 +331508.99 3580.0 C57
2021-01-22 16:44:08 S 04 55 23.203 -78 46 50.56 V C57
2021-01-22 16:44:08 s 1 -152360.49 5 +330828.64 2460.0 C57
2021-01-22 17:04:08 S 04 55 41.750 -78 46 45.52 V C57
2021-01-22 17:04:08 s 1 -152869.36 6 +330144.38 8280.0 C57
2021-01-22 17:14:07 S 04 55 50.854 -78 46 46.27 V C57
2021-01-22 17:14:07 s 1 -153123.12 8 +329800.79 50.0 C57
2021-01-22 17:34:07 S 04 56 09.422 -78 46 44.90 V C57
2021-01-22 17:34:07 s 1 -153629.29 9 +329110.66 1270.0 C57
2021-01-22 17:44:08 S 04 56 21.134 -78 46 44.72 V C57
2021-01-22 17:44:08 s 1 -153881.70 4 +328764.13 720.0 C57
2021-01-22 18:14:08 S 04 56 49.186 -78 46 38.75 V C57
2021-01-22 18:14:08 s 1 -154636.18 1 +327718.66 4390.0 C57
2021-01-22 18:24:07 S 04 56 58.411 -78 46 39.43 V C57
2021-01-22 18:24:07 s 1 -154886.75 5 +327368.21 710.0 C57
2021-01-22 18:34:08 S 04 57 07.500 -78 46 37.38 V C57
2021-01-22 18:34:08 s 1 -155136.86 7 +327016.78 6240.0 C57
2021-01-22 18:54:08 S 04 57 26.758 -78 46 35.29 V C57
2021-01-22 18:54:08 s 1 -155635.70 1 +326310.96 4930.0 C57
2021-01-22 19:04:07 S 04 57 36.060 -78 46 34.14 V C57
2021-01-22 19:04:07 s 1 -155884.41 9 +325956.58 8090.0 C57
2021-01-22 19:14:08 S 04 57 45.334 -78 46 32.92 V C57
2021-01-22 19:14:08 s 1 -156132.66 9 +325601.21 440.0 C57
2021-01-22 19:24:08 S 04 57 54.602 -78 46 31.12 V C57
2021-01-22 19:24:08 s 1 -156380.44 9 +325244.86 1990.0 C57
2021-01-22 19:34:07 S 04 58 03.893 -78 46 28.42 V C57
2021-01-22 19:34:07 s 1 -156627.75 8 +324887.52 2730.0 C57
2021-01-22 19:44:08 S 04 58 13.529 -78 46 27.48 V C57
2021-01-22 19:44:08 s 1 -156874.59 5 +324529.19 2670.0 C57
2021-01-22 19:54:07 S 04 58 22.735 -78 46 27.55 V C57
2021-01-22 19:54:07 s 1 -157120.95 7 +324169.88 1790.0 C57
2021-01-22 20:04:08 S 04 58 33.103 -78 46 22.76 V C57
2021-01-22 20:04:08 s 1 -157366.84 3 +323809.58 100.0 C57
2021-01-22 20:14:07 S 04 58 40.882 -78 46 23.70 V C57
2021-01-22 20:14:07 s 1 -157612.25 1 +323448.29 7600.0 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)