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
2020-09-13 11:16:38 C 00 08 04.78 +32 17 27.1 – V T08
2020-09-13 11:26:11 C 00 08 04.21 +32 17 33.5 – V T08
2020-09-14 12:59:38 C 00 06 49.88 +32 33 35.8 – q P87
2020-09-14 13:10:54 C 00 06 49.21 +32 33 43.0 – q P87
2020-09-14 13:21:12 C 00 06 48.60 +32 33 50.6 – q P87
2020-09-15 11:14:49 C 00 05 37.93 +32 47 24.1 – V T05
2020-09-15 11:19:26 C 00 05 37.63 +32 47 26.9 – V T05
2020-09-15 11:33:42 C 00 05 36.69 +32 47 35.1 – V T05
2020-09-16 07:20:15 C 00 04 32.01 +32 59 06.3 – V 703
2020-09-16 07:27:52 C 00 04 31.48 +32 59 11.0 – V 703
2020-09-16 07:35:30 C 00 04 31.00 +32 59 15.5 – V 703
2020-09-16 07:43:14 C 00 04 30.47 +32 59 20.2 – V 703
2020-09-17 07:48:25 C 00 03 07.09 +33 12 54.7 – U I41
2020-09-17 08:17:11 C 00 03 05.08 +33 13 10.5 – U I41
2020-09-17 09:16:56 C 00 03 00.89 +33 13 42.5 – U I41
2020-09-17 09:53:06 C 00 03 00.06 +33 14 11.4 – V T08
2020-09-17 09:54:18 C 00 02 58.30 +33 14 01.9 – U I41
2020-09-17 10:25:28 C 00 02 57.75 +33 14 29.7 – V T08
2020-09-17 10:34:38 C 00 02 57.10 +33 14 34.7 – V T08
2020-09-17 10:39:17 C 00 02 56.76 +33 14 36.9 – V T08
2020-09-18 08:12:18 C 00 01 37.70 +33 25 58.8 – V G96
2020-09-18 08:21:09 C 00 01 37.06 +33 26 03.2 – V G96
2020-09-18 08:30:02 C 00 01 36.41 +33 26 07.8 – V G96
2020-09-18 08:38:55 C 00 01 35.76 +33 26 12.0 – V G96
2020-09-19 06:44:22 C 00 00 12.96 +33 37 23.9 – V 703
2020-09-19 06:45:00 C 00 00 12.91 +33 37 24.1 – V 703
2020-09-19 06:52:20 C 00 00 12.41 +33 37 27.7 – V 703
2020-09-19 06:52:58 C 00 00 12.29 +33 37 28.1 – V 703
2020-09-19 07:01:24 C 00 00 11.64 +33 37 32.3 – V 703
2020-09-19 07:09:02 C 00 00 11.12 +33 37 36.3 – V 703
2020-09-19 07:09:40 C 00 00 11.04 +33 37 36.5 – V 703
2020-09-21 08:17:35 C 23 56 52.01 +34 00 00.1 – V U63
2020-09-21 08:22:50 C 23 56 51.56 +34 00 02.5 – V U63
2020-09-21 09:42:28 C 23 56 45.30 +34 00 34.8 – V U63
2020-09-21 09:47:44 C 23 56 44.84 +34 00 37.2 – V U63
2020-09-21 10:20:23 C 23 56 43.53 +34 01 11.2 – V T08
2020-09-21 10:36:48 C 23 56 42.16 +34 01 17.9 – V T08
2020-09-21 10:50:54 C 23 56 40.99 +34 01 23.8 – V T08
2020-09-21 11:07:58 C 23 56 39.56 +34 01 30.9 – V T08
2020-09-22 01:54:01 C 23 55 39.29 +34 07 18.5 – V W33
2020-09-22 02:04:28 C 23 55 38.46 +34 07 23.4 – V W33
2020-09-22 02:14:53 C 23 55 37.63 +34 07 28.2 – V W33
2020-09-22 06:41:26 C 23 55 16.93 +34 09 21.7 – V 703
2020-09-22 06:49:06 C 23 55 16.21 +34 09 24.5 – V 703
2020-09-22 06:56:48 C 23 55 15.61 +34 09 27.6 – V 703
2020-09-22 07:04:35 C 23 55 14.96 +34 09 30.4 – V 703
2020-09-22 10:41:10 C 23 54 58.73 +34 11 03.9 – V T08
2020-09-22 10:45:49 C 23 54 58.33 +34 11 05.7 – V T08
2020-09-22 11:42:59 C 23 54 53.44 +34 11 26.3 – V T08
2020-09-22 22:41:15 C 23 54 06.57 +34 15 14.0 – V L65
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)