IAA RAS IAA Minor Planet Database

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
2020-09-05 03:02:51 C 00 15 16.92 +29 51 42.9 – V C95
2020-09-05 03:13:47 C 00 15 16.64 +29 51 51.4 – V C95
2020-09-06 01:10:21 C 00 14 43.50 +30 09 07.1 – V 160
2020-09-06 01:15:18 C 00 14 43.36 +30 09 10.4 – V 160
2020-09-06 01:20:14 C 00 14 43.20 +30 09 14.1 – V 160
2020-09-06 02:30:51 C 00 14 40.86 +30 10 08.0 – V C95
2020-09-06 02:38:11 C 00 14 40.70 +30 10 13.4 – V C95
2020-09-06 22:52:12 C 00 14 07.94 +30 25 52.0 – V 160
2020-09-06 22:57:00 C 00 14 07.78 +30 25 55.7 – V 160
2020-09-06 23:01:59 C 00 14 07.59 +30 25 59.8 – V 160
2020-09-07 19:19:31 C 00 13 28.69 +30 41 30.3 – q D29
2020-09-07 19:41:38 C 00 13 27.84 +30 41 46.2 – q D29
2020-09-07 20:03:45 C 00 13 26.95 +30 42 01.9 – q D29
2020-09-08 10:40:28 C 00 13 00.243 +30 53 08.61 – U F51
2020-09-08 10:52:40 C 00 12 59.714 +30 53 17.83 – U F51
2020-09-08 11:06:02 C 00 12 59.128 +30 53 27.91 – U F51
2020-09-08 13:52:06 C 00 12 51.930 +30 55 28.33 – U F52
2020-09-08 14:06:50 C 00 12 51.312 +30 55 38.61 – U F52
2020-09-08 14:21:34 C 00 12 50.702 +30 55 48.83 – U F52
2020-09-08 14:36:18 C 00 12 50.080 +30 55 59.16 – U F52
2020-09-09 09:30:54 C 00 12 13.115 +31 09 56.36 – U F52
2020-09-09 09:40:56 C 00 12 12.658 +31 10 04.00 – U F51
2020-09-09 09:42:56 C 00 12 12.565 +31 10 05.58 – U F52
2020-09-09 09:54:10 C 00 12 12.051 +31 10 14.03 – U F51
2020-09-09 09:55:02 C 00 12 12.010 +31 10 14.71 – U F52
2020-09-09 10:07:09 C 00 12 11.450 +31 10 23.81 – U F52
2020-09-09 10:07:18 C 00 12 11.450 +31 10 23.92 – U F51
2020-09-09 11:52:08 C 00 12 06.53 +31 11 41.6 – V T08
2020-09-09 12:00:59 C 00 12 06.12 +31 11 47.8 – V T08
2020-09-09 12:06:05 C 00 12 05.87 +31 11 51.4 – V T08
2020-09-09 12:42:54 C 00 12 04.16 +31 12 17.5 – V T08
2020-09-09 22:27:41 C 00 11 44.09 +31 19 06.1 – V 160
2020-09-09 22:30:01 C 00 11 43.98 +31 19 07.9 – V 160
2020-09-09 22:33:30 C 00 11 43.82 +31 19 10.3 – V 160
2020-09-10 10:25:38 C 00 11 16.187 +31 27 53.37 – U F52
2020-09-10 10:40:26 C 00 11 15.455 +31 28 03.98 – U F52
2020-09-10 10:55:16 C 00 11 14.710 +31 28 14.68 – U F52
2020-09-11 11:34:47 C 00 10 13.954 +31 45 30.49 – U F52
2020-09-11 11:38:41 C 00 10 13.744 +31 45 33.16 – U F51
2020-09-11 11:47:06 C 00 10 13.297 +31 45 38.84 – U F52
2020-09-11 11:51:52 C 00 10 13.043 +31 45 42.08 – U F51
2020-09-11 11:59:21 C 00 10 12.653 +31 45 47.16 – U F52
2020-09-11 12:05:02 C 00 10 12.350 +31 45 50.97 – U F51
2020-09-11 12:11:05 C 00 10 12.04 +31 45 55.0 – V T05
2020-09-11 12:11:33 C 00 10 12.007 +31 45 55.36 – U F52
2020-09-11 12:18:11 C 00 10 11.656 +31 45 59.81 – U F51
2020-09-11 12:19:19 C 00 10 11.60 +31 46 00.6 – V T05
2020-09-11 12:23:30 C 00 10 11.39 +31 46 03.4 – V T05
2020-09-11 12:45:25 C 00 10 10.23 +31 46 17.9 – V T05
2020-09-13 11:10:28 C 00 08 05.14 +32 17 23.4 – V T08
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)