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
2021-01-22 20:24:08 S 04 58 50.712 -78 46 18.16 V C57
2021-01-22 20:24:08 s 1 -157857.18 0 +323086.01 4270.0 C57
2021-01-22 20:34:07 S 04 59 01.454 -78 46 16.64 V C57
2021-01-22 20:34:07 s 1 -158101.62 8 +322722.74 120.0 C57
2021-01-22 20:44:07 S 04 59 09.792 -78 46 15.02 V C57
2021-01-22 20:44:07 s 1 -158345.59 3 +322358.49 5150.0 C57
2021-01-22 20:54:06 S 04 59 19.750 -78 46 15.85 V C57
2021-01-22 20:54:06 s 1 -158589.07 5 +321993.24 9350.0 C57
2021-01-22 21:04:07 S 04 59 29.162 -78 46 13.98 V C57
2021-01-22 21:04:07 s 1 -158832.07 0 +321627.00 2720.0 C57
2021-01-22 21:14:08 S 04 59 39.350 -78 46 10.92 V C57
2021-01-22 21:14:08 s 1 -159074.57 8 +321259.77 5250.0 C57
2021-01-22 21:24:07 S 04 59 49.903 -78 46 11.14 V C57
2021-01-22 21:24:07 s 1 -159316.59 7 +320891.54 6950.0 C57
2021-01-22 21:34:08 S 04 59 56.921 -78 46 11.39 V C57
2021-01-22 21:34:08 s 1 -159558.12 5 +320522.32 7810.0 C57
2021-01-22 21:44:07 S 05 00 05.621 -78 46 09.12 V C57
2021-01-22 21:44:07 s 1 -159799.16 0 +320152.11 7820.0 C57
2021-01-22 21:54:08 S 05 00 17.246 -78 46 06.42 V C57
2021-01-22 21:54:08 s 1 -160039.70 2 +319780.90 6990.0 C57
2021-01-22 22:04:07 S 05 00 25.099 -78 46 01.92 V C57
2021-01-22 22:04:07 s 1 -160279.74 7 +319408.70 5310.0 C57
2021-01-22 22:14:07 S 05 00 35.018 -78 46 02.21 V C57
2021-01-22 22:14:07 s 1 -160519.29 5 +319035.50 2780.0 C57
2021-01-22 22:24:08 S 05 00 44.938 -78 45 59.65 V C57
2021-01-22 22:24:08 s 1 -160758.34 3 +318661.30 9400.0 C57
2021-01-22 22:34:07 S 05 00 54.456 -78 45 55.30 V C57
2021-01-22 22:34:07 s 1 -160996.89 0 +318286.11 5150.0 C57
2021-01-22 22:44:08 S 05 01 03.514 -78 45 55.12 V C57
2021-01-22 22:44:08 s 1 -161234.93 5 +317909.92 50.0 C57
2021-01-22 22:54:07 S 05 01 12.240 -78 45 51.80 V C57
2021-01-22 22:54:07 s 1 -161472.47 5 +317532.73 4080.0 C57
2021-01-22 23:04:08 S 05 01 22.272 -78 45 51.37 V C57
2021-01-22 23:04:08 s 1 -161709.50 9 +317154.54 7250.0 C57
2021-01-22 23:14:07 S 05 01 32.354 -78 45 49.79 V C57
2021-01-22 23:14:07 s 1 -161946.03 5 +316775.35 9540.0 C57
2021-01-22 23:24:08 S 05 01 41.573 -78 45 45.65 V C57
2021-01-22 23:24:08 s 1 -162182.05 1 +316395.15 970.0 C57
2021-01-22 23:34:07 S 05 01 47.957 -78 45 48.31 V C57
2021-01-22 23:34:07 s 1 -162417.55 6 +316013.96 1510.0 C57
2021-01-22 23:44:07 S 05 02 02.942 -78 45 37.98 V C57
2021-01-22 23:44:07 s 1 -162652.54 8 +315631.76 1180.0 C57
2021-01-22 23:54:08 S 05 02 09.389 -78 45 38.70 V C57
2021-01-22 23:54:08 s 1 -162887.02 5 +315248.57 9970.0 C57
2021-01-23 00:04:07 S 05 02 18.751 -78 45 37.04 V C57
2021-01-23 00:04:07 s 1 -163120.98 5 +314864.36 7870.0 C57
2021-01-23 00:14:08 S 05 02 27.878 -78 45 35.82 V C57
2021-01-23 00:14:08 s 1 -163354.42 7 +314479.16 4880.0 C57
2021-01-23 00:24:07 S 05 02 38.086 -78 45 32.94 V C57
2021-01-23 00:24:07 s 1 -163587.34 8 +314092.94 1000.0 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)