IAA RAS IAA Minor Planet Database

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
2021-03-12 19:04:06 S 10 37 31.433 -50 04 38.06 – V C57
2021-03-12 19:14:06 S 10 37 31.838 -50 04 22.01 – V C57
2021-03-12 19:24:06 S 10 37 32.042 -50 04 03.00 – V C57
2021-03-12 19:34:06 S 10 37 32.650 -50 03 45.86 – V C57
2021-03-12 19:44:06 S 10 37 33.106 -50 03 28.69 – V C57
2021-03-12 19:54:06 S 10 37 33.314 -50 03 12.28 – V C57
2021-03-12 20:04:06 S 10 37 33.401 -50 02 54.28 – V C57
2021-03-12 20:14:06 S 10 37 34.296 -50 02 39.05 – V C57
2021-03-12 20:24:06 S 10 37 34.517 -50 02 22.42 – V C57
2021-03-12 20:34:06 S 10 37 34.579 -50 02 05.39 – V C57
2021-03-12 20:44:06 S 10 37 35.045 -50 01 50.38 – V C57
2021-03-12 20:54:06 S 10 37 35.717 -50 01 28.49 – V C57
2021-03-12 21:04:06 S 10 37 36.065 -50 01 15.10 – V C57
2021-03-12 21:14:06 S 10 37 36.046 -50 00 58.46 – V C57
2021-03-12 21:34:06 S 10 37 37.440 -50 00 28.58 – V C57
2021-03-12 21:44:06 S 10 37 37.735 -50 00 05.44 – V C57
2021-03-12 21:54:06 S 10 37 37.783 -49 59 53.81 – V C57
2021-03-12 22:04:06 S 10 37 38.078 -49 59 36.10 – V C57
2021-03-12 22:14:06 S 10 37 38.354 -49 59 15.68 – V C57
2021-03-12 22:24:06 S 10 37 38.554 -49 59 01.03 – V C57
2021-03-12 22:34:06 S 10 37 39.288 -49 58 45.80 – V C57
2021-03-12 22:44:06 S 10 37 39.437 -49 58 30.04 – V C57
2021-03-12 22:54:06 S 10 37 39.828 -49 58 10.38 – V C57
2021-03-12 23:04:06 S 10 37 40.481 -49 57 55.26 – V C57
2021-03-12 23:14:06 S 10 37 40.898 -49 57 38.77 – V C57
2021-03-12 23:24:06 S 10 37 41.232 -49 57 19.76 – V C57
2021-03-12 23:34:06 S 10 37 41.280 -49 57 04.79 – V C57
2021-03-12 23:44:06 S 10 37 41.542 -49 56 46.36 – V C57
2021-03-12 23:44:06 s 1 -10061.330 0 +376023.23 8220.0 – C57
2021-03-12 23:54:06 S 10 37 42.065 -49 56 32.50 – V C57
2021-03-12 23:54:06 s 1 -10432.469 0 +376076.98 3680.0 – C57
2021-03-13 00:04:06 S 10 37 42.533 -49 56 12.55 – V C57
2021-03-13 00:04:06 s 1 -10803.590 0 +376129.70 9100.0 – C57
2021-03-13 00:14:06 S 10 37 43.032 -49 55 56.35 – V C57
2021-03-13 00:14:06 s 1 -11174.692 0 +376181.40 4480.0 – C57
2021-03-13 00:24:06 S 10 37 43.327 -49 55 40.04 – V C57
2021-03-13 00:24:06 s 1 -11545.773 0 +376232.09 9830.0 – C57
2021-03-13 00:34:06 S 10 37 43.442 -49 55 22.98 – V C57
2021-03-13 00:34:06 s 1 -11916.834 0 +376281.75 5130.0 – C57
2021-03-13 00:44:06 S 10 37 43.956 -49 55 05.95 – V C57
2021-03-13 00:44:06 s 1 -12287.873 0 +376330.40 410.0 – C57
2021-03-13 00:54:06 S 10 37 44.074 -49 54 49.54 – V C57
2021-03-13 00:54:06 s 1 -12658.888 0 +376378.02 5650.0 – C57
2021-03-13 01:04:06 S 10 37 44.966 -49 54 31.14 – V C57
2021-03-13 01:04:06 s 1 -13029.880 0 +376424.63 860.0 – C57
2021-03-13 01:14:06 S 10 37 44.988 -49 54 16.45 – V C57
2021-03-13 01:14:06 s 1 -13400.847 0 +376470.22 6050.0 – C57
2021-03-13 01:24:06 S 10 37 45.262 -49 53 58.67 – V C57
2021-03-13 01:24:06 s 1 -13771.788 0 +376514.80 1210.0 – C57
2021-03-13 01:34:06 S 10 37 45.590 -49 53 39.08 – 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)