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 05:24:07 S 05 53 15.734 -78 04 43.32 V C57
2021-01-25 05:24:07 s 1 -196509.02 5 +135007.51 7000.0 C57
2021-01-25 05:34:07 S 05 53 25.519 -78 04 30.54 V C57
2021-01-25 05:34:07 s 1 -196409.39 0 +134246.58 1380.0 C57
2021-01-25 05:44:07 S 05 53 35.242 -78 04 15.17 V C57
2021-01-25 05:44:07 s 1 -196307.72 3 +133484.27 2160.0 C57
2021-01-25 06:04:07 S 05 53 54.247 -78 03 48.67 V C57
2021-01-25 06:04:07 s 1 -196098.24 7 +131955.51 2790.0 C57
2021-01-25 07:24:07 S 05 55 13.764 -78 01 58.80 V C57
2021-01-25 07:24:07 s 1 -195176.66 3 +125785.08 6580.0 C57
2021-01-25 07:34:07 S 05 55 22.128 -78 01 45.48 V C57
2021-01-25 07:34:07 s 1 -195051.84 4 +125007.53 6200.0 C57
2021-01-25 07:44:07 S 05 55 32.695 -78 01 32.41 V C57
2021-01-25 07:44:07 s 1 -194924.84 3 +124228.59 1930.0 C57
2021-01-25 07:54:07 S 05 55 42.482 -78 01 19.24 V C57
2021-01-25 07:54:07 s 1 -194795.64 8 +123448.26 3760.0 C57
2021-01-25 08:04:07 S 05 55 50.923 -78 01 08.08 V C57
2021-01-25 08:04:07 s 1 -194664.24 5 +122666.54 1660.0 C57
2021-01-25 08:14:07 S 05 56 01.438 -78 00 48.89 V C57
2021-01-25 08:14:07 s 1 -194530.62 1 +121883.43 5610.0 C57
2021-01-25 08:34:07 S 05 56 20.861 -78 00 22.14 V C57
2021-01-25 08:34:07 s 1 -194256.65 6 +120313.02 1540.0 C57
2021-01-25 08:44:07 S 05 56 30.878 -78 00 09.65 V C57
2021-01-25 08:44:07 s 1 -194116.28 6 +119525.73 3480.0 C57
2021-01-25 08:54:07 S 05 56 39.989 -77 59 49.38 V C57
2021-01-25 08:54:07 s 1 -193973.64 0 +118737.05 1360.0 C57
2021-01-25 09:04:07 S 05 56 50.525 -77 59 35.16 V C57
2021-01-25 09:04:07 s 1 -193828.70 4 +117946.97 5170.0 C57
2021-01-25 09:54:07 S 05 57 39.509 -77 58 26.69 V C57
2021-01-25 09:54:07 s 1 -193069.16 5 +113975.64 2090.0 C57
2021-01-25 10:04:07 S 05 57 49.337 -77 58 10.99 V C57
2021-01-25 10:04:07 s 1 -192910.18 3 +113177.19 870.0 C57
2021-01-25 10:14:07 S 05 57 58.462 -77 57 57.53 V C57
2021-01-25 10:14:07 s 1 -192748.80 9 +112377.34 5380.0 C57
2021-01-25 10:24:07 S 05 58 08.933 -77 57 42.52 V C57
2021-01-25 10:24:07 s 1 -192585.02 6 +111576.09 5600.0 C57
2021-01-25 10:34:07 S 05 58 18.218 -77 57 26.39 V C57
2021-01-25 10:34:07 s 1 -192418.82 0 +110773.45 1500.0 C57
2021-01-25 11:34:07 S 05 59 18.067 -77 55 59.45 V C57
2021-01-25 11:34:07 s 1 -191369.81 8 +105928.28 4550.0 C57
2021-01-25 11:44:07 S 05 59 27.444 -77 55 46.13 V C57
2021-01-25 11:44:07 s 1 -191186.20 7 +105115.87 9400.0 C57
2021-01-25 11:54:07 S 05 59 38.170 -77 55 28.45 V C57
2021-01-25 11:54:07 s 1 -191000.04 5 +104302.06 9690.0 C57
2021-01-25 12:04:07 S 05 59 47.474 -77 55 13.19 V C57
2021-01-25 12:04:07 s 1 -190811.31 5 +103486.85 5400.0 C57
2021-01-25 12:14:07 S 05 59 56.626 -77 55 00.98 V C57
2021-01-25 12:14:07 s 1 -190620.00 0 +102670.26 6490.0 C57
2021-01-25 12:24:07 S 06 00 06.888 -77 54 43.92 V C57
2021-01-25 12:24:07 s 1 -190426.08 4 +101852.26 2940.0 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)