226554 (2003 WR21)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.2614415687 ± 5.94e-09
Semi-major axis (a)1.1183165140 AU ± 5.73e-10
Inclination (i)9.26554296° ± 9.76e-07
Long. of Asc. Node (Ω)85.76254611° ± 3.18e-06
Arg. of Perihelion (ω)108.10852916° ± 3.60e-06
Mean Anomaly (M)96.44633593° ± 1.10e-06
Mean Motion (n)0.8334224003°/day ± 6.41e-10
Perihelion dist (q)0.82594209 AU ± 6.66e-09
Aphelion dist (Q)1.41069094 AU ± 6.68e-09
Orbital Period1.18262514 yr ± 9.09e-10
Physical Parameters
H (abs. magnitude)19.62
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.024″
Uncertainty0
Orbit TypeApollo
MOID0.030803 AU
Observations Used461
Radar Obs Used2
Gaia Obs Used21
Oppositions4
Arc Total1990-2023
First Observation Used1990-10-24
Last Observation Used2023-11-11
Observations (507)
Date Type RA Dec Mag Band Observatory
1990-10-24 10:12:00 05 05 43.20 +04 15 54.2 c 261
1990-10-24 11:21:59 05 05 42.41 +04 15 42.6 c 261
2003-11-20 05:27:23 C 03 09 00.45 -02 30 28.7 d 703
2003-11-20 05:46:53 C 03 08 57.72 -02 30 25.9 d 703
2003-11-20 06:06:22 C 03 08 55.05 -02 30 22.3 d 703
2003-11-20 06:25:50 C 03 08 52.40 -02 30 19.0 d 703
2003-11-20 20:46:14 C 03 07 01.81 -02 27 35.3 c 246
2003-11-20 20:47:42 C 03 07 01.60 -02 27 35.0 c 246
2003-11-20 20:48:51 C 03 07 01.45 -02 27 35.1 c 246
2003-11-20 20:50:26 C 03 07 01.20 -02 27 35.0 c 246
2003-11-20 20:51:48 C 03 07 01.05 -02 27 34.6 c 246
2003-11-20 20:53:18 C 03 07 00.80 -02 27 33.8 c 246
2003-11-20 23:35:45 C 03 06 39.20 -02 26 57.4 o 620
2003-11-20 23:48:42 C 03 06 37.45 -02 26 55.0 o 620
2003-11-21 00:01:40 C 03 06 35.77 -02 26 52.9 o 620
2003-11-21 04:01:56 C 03 06 06.08 -02 25 59.3 c 854
2003-11-21 04:11:26 C 03 06 04.66 -02 25 57.1 c 854
2003-11-21 04:13:01 C 03 06 04.46 -02 25 56.8 c 854
2003-11-21 05:14:11 C 03 05 56.21 -02 25 43.5 c 701
2003-11-21 05:44:47 C 03 05 52.22 -02 25 37.4 c 701
2003-11-21 06:01:07 C 03 05 49.79 -02 25 33.9 r 448
2003-11-21 06:09:26 C 03 05 48.65 -02 25 32.0 r 448
2003-11-21 06:15:21 C 03 05 48.00 -02 25 30.3 c 701
2003-11-21 06:19:34 C 03 05 47.28 -02 25 29.8 r 448
2003-11-24 20:39:37 C 02 54 40.24 -02 02 11.1 r 170
2003-11-24 20:42:39 C 02 54 39.84 -02 02 09.8 r 170
2003-11-24 20:46:18 C 02 54 39.35 -02 02 08.9 r 170
2003-11-24 20:52:57 C 02 54 38.48 -02 02 06.4 r 170
2003-11-24 21:15:51 C 02 54 35.41 -02 01 58.5 r 176
2003-11-24 21:18:08 C 02 54 35.08 -02 01 57.7 r 176
2003-11-24 21:20:28 C 02 54 34.74 -02 01 57.0 r 176
2003-11-24 21:24:00 C 02 54 34.24 -02 01 55.8 r 176
2003-11-27 02:09:18 C 02 47 53.80 -01 42 55.0 c 711
2003-11-27 02:18:04 C 02 47 52.69 -01 42 52.1 c 711
2003-11-27 02:26:49 C 02 47 51.51 -01 42 48.8 c 711
2003-11-28 05:07:35 C 02 44 31.27 -01 31 56.4 o 715
2003-11-28 05:12:02 C 02 44 30.66 -01 31 54.1 o 715
2003-11-28 05:16:28 C 02 44 30.10 -01 31 52.4 o 715
2003-11-28 05:20:55 C 02 44 29.50 -01 31 50.6 o 715
2003-11-29 04:39:15 C 02 41 38.18 -01 21 38.9 18.5 c 704
2003-11-29 04:58:11 C 02 41 35.69 -01 21 29.9 19.3 c 704
2003-11-29 05:17:07 C 02 41 33.23 -01 21 20.7 18.8 c 704
2003-11-29 05:36:13 C 02 41 30.76 -01 21 12.3 18.8 c 704
2003-11-29 05:55:01 C 02 41 28.35 -01 21 03.7 18.9 c 704
2003-12-03 03:48:18 C 02 30 27.57 -00 33 34.7 r 448
2003-12-03 04:03:23 C 02 30 25.77 -00 33 26.4 r 448
2003-12-03 04:18:04 C 02 30 24.03 -00 33 18.1 r 448
2003-12-10 06:44:02 C 02 13 00.00 +01 14 57.3 o 699
2003-12-10 07:02:59 C 02 12 58.11 +01 15 09.7 o 699
2003-12-10 07:22:01 C 02 12 56.21 +01 15 25.4 o 699
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2017-06-04 12:00:00 13142.192 0.1 Hz 2380 -1 -1
2017-06-04 13:32:00 121966694.32 0.5 us 2380 -1 -1
Station codes
-1 Arecibo (305-m, 1963–2020)