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
2021-01-25 00:24:07 S 05 48 26.112 -78 11 06.14 V C57
2021-01-25 00:24:07 s 1 -198608.61 7 +157198.68 7820.0 C57
2021-01-25 00:34:07 S 05 48 34.762 -78 10 57.61 V C57
2021-01-25 00:34:07 s 1 -198564.85 8 +156478.66 1250.0 C57
2021-01-25 00:44:07 S 05 48 45.701 -78 10 40.91 V C57
2021-01-25 00:44:07 s 1 -198519.38 3 +155757.29 1650.0 C57
2021-01-25 00:54:07 S 05 48 54.718 -78 10 32.20 V C57
2021-01-25 00:54:07 s 1 -198472.18 1 +155034.57 8990.0 C57
2021-01-25 01:04:07 S 05 49 04.212 -78 10 18.37 V C57
2021-01-25 01:04:07 s 1 -198423.24 2 +154310.50 3260.0 C57
2021-01-25 01:24:07 S 05 49 22.505 -78 09 55.26 V C57
2021-01-25 01:24:07 s 1 -198320.12 0 +152858.32 2510.0 C57
2021-01-25 01:44:07 S 05 49 43.819 -78 09 34.70 V C57
2021-01-25 01:44:07 s 1 -198209.93 9 +151400.74 9270.0 C57
2021-01-25 01:54:07 S 05 49 52.649 -78 09 14.69 V C57
2021-01-25 01:54:07 s 1 -198152.17 8 +150669.91 7920.0 C57
2021-01-25 02:04:07 S 05 50 02.849 -78 09 05.00 V C57
2021-01-25 02:04:07 s 1 -198092.62 3 +149937.73 3390.0 C57
2021-01-25 02:14:07 S 05 50 11.623 -78 08 50.50 V C57
2021-01-25 02:14:07 s 1 -198031.26 5 +149204.19 5670.0 C57
2021-01-25 02:24:07 S 05 50 21.806 -78 08 36.85 V C57
2021-01-25 02:24:07 s 1 -197968.09 3 +148469.29 4730.0 C57
2021-01-25 02:34:07 S 05 50 31.013 -78 08 24.61 V C57
2021-01-25 02:34:07 s 1 -197903.09 8 +147733.04 570.0 C57
2021-01-25 02:44:07 S 05 50 40.085 -78 08 12.26 V C57
2021-01-25 02:44:07 s 1 -197836.26 9 +146995.42 3150.0 C57
2021-01-25 02:54:07 S 05 50 50.383 -78 07 59.92 V C57
2021-01-25 02:54:07 s 1 -197767.59 6 +146256.44 2470.0 C57
2021-01-25 03:14:07 S 05 51 09.430 -78 07 34.72 V C57
2021-01-25 03:14:07 s 1 -197624.67 7 +144774.39 1230.0 C57
2021-01-25 03:24:07 S 05 51 19.764 -78 07 20.60 V C57
2021-01-25 03:24:07 s 1 -197550.41 0 +144031.32 630.0 C57
2021-01-25 03:34:07 S 05 51 29.880 -78 07 07.57 V C57
2021-01-25 03:34:07 s 1 -197474.25 8 +143286.88 6680.0 C57
2021-01-25 03:44:07 S 05 51 39.115 -78 06 56.99 V C57
2021-01-25 03:44:07 s 1 -197396.21 0 +142541.07 9380.0 C57
2021-01-25 03:54:07 S 05 51 48.691 -78 06 42.23 V C57
2021-01-25 03:54:07 s 1 -197316.25 4 +141793.89 8690.0 C57
2021-01-25 04:04:07 S 05 51 58.058 -78 06 30.42 V C57
2021-01-25 04:04:07 s 1 -197234.38 1 +141045.34 4600.0 C57
2021-01-25 04:24:07 S 05 52 17.239 -78 06 01.69 V C57
2021-01-25 04:24:07 s 1 -197064.83 7 +139544.13 6140.0 C57
2021-01-25 04:34:07 S 05 52 26.657 -78 05 53.34 V C57
2021-01-25 04:34:07 s 1 -196977.14 5 +138791.47 1720.0 C57
2021-01-25 04:54:07 S 05 52 46.342 -78 05 23.10 V C57
2021-01-25 04:54:07 s 1 -196795.86 3 +137282.02 2430.0 C57
2021-01-25 05:04:07 S 05 52 57.238 -78 05 10.07 V C57
2021-01-25 05:04:07 s 1 -196702.25 0 +136525.22 7500.0 C57
2021-01-25 05:14:07 S 05 53 06.089 -78 04 55.67 V C57
2021-01-25 05:14:07 s 1 -196606.64 2 +135767.06 9040.0 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)