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
2021-03-31 20:54:05 S 10 53 59.093 -34 20 44.66 V C57
2021-03-31 20:54:05 s 1 -168581.03 2 +37229.251 5930.0 C57
2021-03-31 21:04:05 S 10 53 59.172 -34 20 22.27 V C57
2021-03-31 21:04:05 s 1 -168181.21 3 +36301.681 9580.0 C57
2021-03-31 21:14:05 S 10 53 59.088 -34 19 59.09 V C57
2021-03-31 21:14:05 s 1 -167776.89 9 +35373.137 4470.0 C57
2021-03-31 21:24:05 S 10 53 59.110 -34 19 34.21 V C57
2021-03-31 21:24:05 s 1 -167368.05 5 +34443.633 560.0 C57
2021-03-31 21:34:05 S 10 53 59.227 -34 19 10.38 V C57
2021-03-31 21:34:05 s 1 -166954.64 4 +33513.185 7750.0 C57
2021-03-31 21:44:05 S 10 53 59.105 -34 18 47.41 V C57
2021-03-31 21:44:05 s 1 -166536.63 2 +32581.808 5990.0 C57
2021-03-31 21:54:05 S 10 53 59.011 -34 18 23.29 V C57
2021-03-31 21:54:05 s 1 -166113.98 2 +31649.519 5200.0 C57
2021-03-31 22:04:05 S 10 53 59.047 -34 17 57.52 V C57
2021-03-31 22:04:05 s 1 -165686.65 8 +30716.335 5310.0 C57
2021-03-31 22:14:05 S 10 53 59.146 -34 17 34.15 V C57
2021-03-31 22:14:05 s 1 -165254.62 3 +29782.272 6250.0 C57
2021-03-31 22:24:05 S 10 53 59.234 -34 17 09.74 V C57
2021-03-31 22:24:05 s 1 -164817.84 0 +28847.349 7950.0 C57
2021-03-31 22:34:05 S 10 53 59.244 -34 16 47.53 V C57
2021-03-31 22:34:05 s 1 -164376.27 2 +27911.584 320.0 C57
2021-03-31 22:44:05 S 10 53 59.302 -34 16 24.31 V C57
2021-03-31 22:44:05 s 1 -163929.87 9 +26974.994 3300.0 C57
2021-03-31 22:54:05 S 10 53 59.429 -34 15 59.83 V C57
2021-03-31 22:54:05 s 1 -163478.62 6 +26037.600 6810.0 C57
2021-03-31 23:04:05 S 10 53 59.225 -34 15 34.67 V C57
2021-03-31 23:04:05 s 1 -163022.47 2 +25099.421 780.0 C57
2021-03-31 23:14:05 S 10 53 59.050 -34 15 11.45 V C57
2021-03-31 23:14:05 s 1 -162561.37 9 +24160.476 5120.0 C57
2021-03-31 23:24:05 S 10 53 59.278 -34 14 45.82 V C57
2021-03-31 23:24:05 s 1 -162095.30 7 +23220.786 9760.0 C57
2021-03-31 23:34:05 S 10 53 59.474 -34 14 22.78 V C57
2021-03-31 23:34:05 s 1 -161624.21 7 +22280.372 4630.0 C57
2021-03-31 23:44:05 S 10 53 59.273 -34 13 58.76 V C57
2021-03-31 23:44:05 s 1 -161148.06 9 +21339.256 9640.0 C57
2021-03-31 23:54:05 S 10 53 59.275 -34 13 36.16 V C57
2021-03-31 23:54:05 s 1 -160666.82 2 +20397.460 4710.0 C57
2021-04-01 00:04:05 S 10 53 59.225 -34 13 10.13 V C57
2021-04-01 00:04:05 s 1 -160180.43 5 +19455.006 9760.0 C57
2021-04-01 00:14:05 S 10 53 59.417 -34 12 44.71 V C57
2021-04-01 00:14:05 s 1 -159688.86 7 +18511.919 4710.0 C57
2021-04-01 01:24:05 S 10 53 59.525 -34 09 56.38 V C57
2021-04-01 01:24:05 s 1 -156099.28 1 +11894.620 9610.0 C57
2021-04-01 01:34:05 S 10 53 59.434 -34 09 30.17 V C57
2021-04-01 01:34:05 s 1 -155564.73 5 +10947.368 740.0 C57
2021-04-01 01:54:05 S 10 53 59.496 -34 08 42.54 V C57
2021-04-01 01:54:05 s 1 -154478.88 7 + 9051.700 320.0 C57
2021-04-01 03:24:05 S 10 53 59.832 -34 04 59.66 V C57
2021-04-01 03:24:05 s 1 -149306.98 8 + 508.300 5940.0 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)