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
2021-01-29 15:44:07 S 07 45 09.641 -76 53 24.25 V C57
2021-01-29 15:44:07 s 1 +137851.79 6 +235406.33 3460.0 C57
2021-01-29 15:54:07 S 07 45 15.221 -76 53 21.48 V C57
2021-01-29 15:54:07 s 1 +137643.76 2 +236035.22 5260.0 C57
2021-01-29 16:04:07 S 07 45 22.913 -76 53 18.49 V C57
2021-01-29 16:04:07 s 1 +137434.76 9 +236662.46 5270.0 C57
2021-01-29 16:14:07 S 07 45 29.345 -76 53 20.29 V C57
2021-01-29 16:14:07 s 1 +137224.82 4 +237288.06 3520.0 C57
2021-01-29 16:24:07 S 07 45 35.981 -76 53 15.14 V C57
2021-01-29 16:24:07 s 1 +137013.93 3 +237912.01 10.0 C57
2021-01-29 16:34:07 S 07 45 42.545 -76 53 16.84 V C57
2021-01-29 16:34:07 s 1 +136802.10 1 +238534.33 4750.0 C57
2021-01-29 16:44:07 S 07 45 49.169 -76 53 13.31 V C57
2021-01-29 16:44:07 s 1 +136589.33 5 +239155.02 7750.0 C57
2021-01-29 16:54:07 S 07 45 54.660 -76 53 12.91 V C57
2021-01-29 16:54:07 s 1 +136375.63 9 +239774.07 9020.0 C57
2021-01-29 17:04:07 S 07 46 02.059 -76 53 10.50 V C57
2021-01-29 17:04:07 s 1 +136161.02 0 +240391.50 8580.0 C57
2021-01-29 17:14:07 S 07 46 08.347 -76 53 09.53 V C57
2021-01-29 17:14:07 s 1 +135945.48 4 +241007.30 6430.0 C57
2021-01-29 17:24:07 S 07 46 14.681 -76 53 08.27 V C57
2021-01-29 17:24:07 s 1 +135729.03 5 +241621.49 2580.0 C57
2021-01-29 17:34:07 S 07 46 21.530 -76 53 07.62 V C57
2021-01-29 17:34:07 s 1 +135511.68 0 +242234.05 7050.0 C57
2021-01-29 17:44:07 S 07 46 27.610 -76 53 01.61 V C57
2021-01-29 17:44:07 s 1 +135293.42 5 +242845.00 9840.0 C57
2021-01-29 17:54:07 S 07 46 34.670 -76 53 04.24 V C57
2021-01-29 17:54:07 s 1 +135074.27 4 +243454.34 970.0 C57
2021-01-29 18:04:07 S 07 46 41.575 -76 53 00.13 V C57
2021-01-29 18:04:07 s 1 +134854.23 3 +244062.08 440.0 C57
2021-01-29 18:14:07 S 07 46 47.938 -76 52 59.81 V C57
2021-01-29 18:14:07 s 1 +134633.30 8 +244668.21 8260.0 C57
2021-01-29 18:24:07 S 07 46 53.534 -76 52 57.40 V C57
2021-01-29 18:24:07 s 1 +134411.50 4 +245272.73 4450.0 C57
2021-01-29 18:34:07 S 07 46 59.654 -76 52 55.38 V C57
2021-01-29 18:34:07 s 1 +134188.82 6 +245875.66 9010.0 C57
2021-01-29 18:44:07 S 07 47 06.454 -76 52 54.16 V C57
2021-01-29 18:44:07 s 1 +133965.28 0 +246477.00 1960.0 C57
2021-01-29 18:54:07 S 07 47 13.718 -76 52 53.62 V C57
2021-01-29 18:54:07 s 1 +133740.87 0 +247076.74 3290.0 C57
2021-01-29 19:04:07 S 07 47 19.800 -76 52 48.76 V C57
2021-01-29 19:04:07 s 1 +133515.60 3 +247674.90 3030.0 C57
2021-01-29 19:14:07 S 07 47 26.114 -76 52 49.44 V C57
2021-01-29 19:14:07 s 1 +133289.48 4 +248271.47 1180.0 C57
2021-01-29 19:24:07 S 07 47 33.314 -76 52 45.80 V C57
2021-01-29 19:24:07 s 1 +133062.51 6 +248866.45 7750.0 C57
2021-01-29 19:34:07 S 07 47 38.774 -76 52 44.62 V C57
2021-01-29 19:34:07 s 1 +132834.70 7 +249459.86 2760.0 C57
2021-01-29 19:44:07 S 07 47 46.181 -76 52 42.82 V C57
2021-01-29 19:44:07 s 1 +132606.06 0 +250051.69 6200.0 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)