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
2021-01-24 14:34:07 S 05 38 59.287 -78 22 04.22 V C57
2021-01-24 14:34:07 s 1 -198447.18 6 +197349.40 4560.0 C57
2021-01-24 14:44:07 S 05 39 08.530 -78 21 54.43 V C57
2021-01-24 14:44:07 s 1 -198490.66 1 +196706.23 1740.0 C57
2021-01-24 14:54:07 S 05 39 17.510 -78 21 43.52 V C57
2021-01-24 14:54:07 s 1 -198532.85 7 +196061.81 6680.0 C57
2021-01-24 15:04:07 S 05 39 26.630 -78 21 35.06 V C57
2021-01-24 15:04:07 s 1 -198573.76 8 +195416.12 9360.0 C57
2021-01-24 15:14:07 S 05 39 37.178 -78 21 22.61 V C57
2021-01-24 15:14:07 s 1 -198613.38 8 +194769.17 9770.0 C57
2021-01-24 16:04:07 S 05 40 25.253 -78 20 34.26 V C57
2021-01-24 16:04:07 s 1 -198791.91 2 +191515.43 7460.0 C57
2021-01-24 16:14:07 S 05 40 35.522 -78 20 21.73 V C57
2021-01-24 16:14:07 s 1 -198823.65 8 +190860.87 4040.0 C57
2021-01-24 16:24:07 S 05 40 44.707 -78 20 11.40 V C57
2021-01-24 16:24:07 s 1 -198854.07 0 +190205.04 8280.0 C57
2021-01-24 16:34:07 S 05 40 54.610 -78 20 01.90 V C57
2021-01-24 16:34:07 s 1 -198883.14 1 +189547.93 160.0 C57
2021-01-24 16:44:07 S 05 41 03.703 -78 19 47.93 V C57
2021-01-24 16:44:07 s 1 -198910.86 5 +188889.55 9670.0 C57
2021-01-24 16:54:07 S 05 41 12.977 -78 19 38.68 V C57
2021-01-24 16:54:07 s 1 -198937.23 6 +188229.89 6800.0 C57
2021-01-24 17:04:07 S 05 41 23.052 -78 19 30.40 V C57
2021-01-24 17:04:07 s 1 -198962.24 7 +187568.95 1540.0 C57
2021-01-24 17:14:07 S 05 41 31.922 -78 19 17.87 V C57
2021-01-24 17:14:07 s 1 -198985.89 1 +186906.73 3880.0 C57
2021-01-24 17:24:07 S 05 41 41.122 -78 19 07.54 V C57
2021-01-24 17:24:07 s 1 -199008.16 2 +186243.22 3800.0 C57
2021-01-24 17:34:07 S 05 41 51.175 -78 18 59.00 V C57
2021-01-24 17:34:07 s 1 -199029.05 3 +185578.43 1290.0 C57
2021-01-24 17:54:07 S 05 42 10.128 -78 18 34.96 V C57
2021-01-24 17:54:07 s 1 -199066.67 0 +184245.00 8950.0 C57
2021-01-24 18:14:07 S 05 42 29.578 -78 18 12.06 V C57
2021-01-24 18:14:07 s 1 -199098.68 7 +182906.42 6760.0 C57
2021-01-24 18:24:07 S 05 42 39.576 -78 18 00.68 V C57
2021-01-24 18:24:07 s 1 -199112.57 8 +182235.19 1930.0 C57
2021-01-24 18:34:07 S 05 42 47.242 -78 17 51.14 V C57
2021-01-24 18:34:07 s 1 -199125.04 8 +181562.67 4610.0 C57
2021-01-24 18:44:07 S 05 42 58.786 -78 17 43.19 V C57
2021-01-24 18:44:07 s 1 -199136.09 1 +180888.85 4770.0 C57
2021-01-24 18:54:07 S 05 43 08.268 -78 17 29.51 V C57
2021-01-24 18:54:07 s 1 -199145.69 9 +180213.74 2400.0 C57
2021-01-24 19:24:07 S 05 43 36.254 -78 17 00.35 V C57
2021-01-24 19:24:07 s 1 -199165.84 5 +178180.62 20.0 C57
2021-01-24 19:44:07 S 05 43 54.737 -78 16 33.28 V C57
2021-01-24 19:44:07 s 1 -199171.97 0 +176818.70 2230.0 C57
2021-01-24 19:54:07 S 05 44 06.547 -78 16 26.33 V C57
2021-01-24 19:54:07 s 1 -199172.81 9 +176135.78 4430.0 C57
2021-01-24 20:04:07 S 05 44 15.348 -78 16 11.86 V C57
2021-01-24 20:04:07 s 1 -199172.18 3 +175451.56 4020.0 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)