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
2021-03-18 01:34:06 s 1 -197629.32 9 +137749.79 6530.0 C57
2021-03-18 01:44:06 S 10 38 34.130 -46 00 51.73 V C57
2021-03-18 01:44:06 s 1 -197579.96 0 +136996.79 7650.0 C57
2021-03-18 01:54:06 S 10 38 33.982 -46 00 26.39 V C57
2021-03-18 01:54:06 s 1 -197528.62 8 +136242.42 5030.0 C57
2021-03-18 02:04:06 S 10 38 33.823 -46 00 04.64 V C57
2021-03-18 02:04:06 s 1 -197475.32 3 +135486.67 8670.0 C57
2021-03-18 02:14:06 S 10 38 33.545 -45 59 43.26 V C57
2021-03-18 02:14:06 s 1 -197420.03 4 +134729.56 8530.0 C57
2021-03-18 02:24:06 S 10 38 33.454 -45 59 18.35 V C57
2021-03-18 02:24:06 s 1 -197362.74 9 +133971.07 4600.0 C57
2021-03-18 03:34:06 S 10 38 32.306 -45 56 33.04 V C57
2021-03-18 03:34:06 s 1 -196904.93 8 +128623.19 9000.0 C57
2021-03-18 03:54:06 S 10 38 32.186 -45 55 49.15 V C57
2021-03-18 03:54:06 s 1 -196755.52 6 +127082.85 4860.0 C57
2021-03-18 06:14:06 S 10 38 29.729 -45 50 18.89 V C57
2021-03-18 06:14:06 s 1 -195467.69 9 +116146.72 5310.0 C57
2021-03-18 06:24:06 S 10 38 29.549 -45 49 53.87 V C57
2021-03-18 06:24:06 s 1 -195358.97 0 +115355.28 3460.0 C57
2021-03-18 06:44:06 S 10 38 29.177 -45 49 06.49 V C57
2021-03-18 06:44:06 s 1 -195134.59 2 +113768.29 6590.0 C57
2021-03-18 07:34:06 S 10 38 28.207 -45 47 07.12 V C57
2021-03-18 07:34:06 s 1 -194532.62 9 +109776.89 6250.0 C57
2021-03-18 08:04:06 S 10 38 27.794 -45 45 55.15 V C57
2021-03-18 08:04:06 s 1 -194142.76 1 +107365.67 9360.0 C57
2021-03-18 08:24:06 S 10 38 27.554 -45 45 09.29 V C57
2021-03-18 08:24:06 s 1 -193870.65 3 +105751.39 1520.0 C57
2021-03-18 08:44:06 S 10 38 26.988 -45 44 19.39 V C57
2021-03-18 08:44:06 s 1 -193588.64 9 +104131.67 4820.0 C57
2021-03-18 08:54:06 S 10 38 26.918 -45 43 56.06 V C57
2021-03-18 08:54:06 s 1 -193443.89 8 +103319.77 4310.0 C57
2021-03-18 09:04:06 S 10 38 26.854 -45 43 31.01 V C57
2021-03-18 09:04:06 s 1 -193296.62 8 +102506.52 9010.0 C57
2021-03-18 09:14:06 S 10 38 26.592 -45 43 07.90 V C57
2021-03-18 09:14:06 s 1 -193146.82 3 +101691.92 8870.0 C57
2021-03-18 09:24:06 S 10 38 26.573 -45 42 45.50 V C57
2021-03-18 09:24:06 s 1 -192994.46 6 +100875.96 3860.0 C57
2021-03-18 09:44:06 S 10 38 26.254 -45 41 53.52 V C57
2021-03-18 09:44:06 s 1 -192682.03 9 +99240.007 9130.0 C57
2021-03-18 09:54:06 S 10 38 25.918 -45 41 33.25 V C57
2021-03-18 09:54:06 s 1 -192521.93 5 +98420.005 9350.0 C57
2021-03-18 10:34:06 S 10 38 25.200 -45 39 55.62 V C57
2021-03-18 10:34:06 s 1 -191855.21 0 +95126.559 10.0 C57
2021-03-18 11:04:06 S 10 38 24.742 -45 38 42.04 V C57
2021-03-18 11:04:06 s 1 -191327.07 5 +92642.420 9390.0 C57
2021-03-18 12:04:06 S 10 38 23.309 -45 36 19.01 V C57
2021-03-18 12:04:06 s 1 -190196.56 6 +87638.261 6430.0 C57
2021-03-18 12:54:06 S 10 38 23.069 -45 34 12.07 V C57
2021-03-18 12:54:06 s 1 -189176.56 9 +83431.913 8520.0 C57
2021-03-18 13:54:06 S 10 38 21.907 -45 31 43.68 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)