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
2016-10-30 10:23:50 C 03 11 49.78 -06 59 13.8 R G45
2016-10-30 10:31:04 C 03 11 48.99 -06 59 15.8 R G45
2016-11-02 07:29:40 C 03 04 21.40 -07 15 07.4 q 703
2016-11-02 07:37:57 C 03 04 20.34 -07 15 07.6 o 691
2016-11-02 07:38:18 C 03 04 20.32 -07 15 07.9 q 703
2016-11-02 07:46:57 C 03 04 19.28 -07 15 09.3 q 703
2016-11-02 07:48:18 C 03 04 19.13 -07 15 09.7 o 691
2016-11-02 07:55:37 C 03 04 18.25 -07 15 11.3 q 703
2016-11-02 07:58:38 C 03 04 17.93 -07 15 11.7 o 691
2016-11-03 04:33:06 C 03 02 00.42 -07 18 56.5 o 691
2016-11-03 04:47:35 C 03 01 58.67 -07 18 59.4 o 691
2016-11-05 06:25:38 C 02 56 16.72 -07 26 05.4 q G96
2016-11-05 06:31:52 C 02 56 15.96 -07 26 06.6 q G96
2016-11-05 06:40:52 C 02 56 14.87 -07 26 07.0 q G96
2016-11-05 06:47:03 C 02 56 14.20 -07 26 07.7 q G96
2016-11-07 08:38:17 C 02 50 22.57 -07 30 16.8 q 703
2016-11-07 08:47:43 C 02 50 21.40 -07 30 17.9 q 703
2016-11-07 08:57:08 C 02 50 20.25 -07 30 18.3 q 703
2016-11-07 09:06:34 C 02 50 19.16 -07 30 18.1 q 703
2016-11-12 07:57:24 C 02 36 09.56 -07 27 21.0 o 691
2016-11-12 08:22:53 C 02 36 06.41 -07 27 18.2 o 691
2016-11-12 08:48:25 C 02 36 03.21 -07 27 15.3 o 691
2016-11-23 06:32:48 C 02 06 38.22 -06 15 38.0 o 691
2016-11-23 06:46:32 C 02 06 36.75 -06 15 32.2 o 691
2016-11-23 07:00:16 C 02 06 35.26 -06 15 25.7 o 691
2016-11-24 04:45:11 C 02 04 24.78 -06 05 42.4 o 691
2016-11-24 04:58:58 C 02 04 23.30 -06 05 35.9 o 691
2016-11-24 05:12:45 C 02 04 21.86 -06 05 29.7 o 691
2016-12-01 04:19:41 C 01 49 30.72 -04 34 25.5 o 691
2016-12-01 04:24:42 C 01 49 30.31 -04 34 22.4 o 691
2016-12-01 04:29:43 C 01 49 29.91 -04 34 19.3 o 691
2016-12-02 02:50:03 C 01 47 48.29 -04 20 12.6 o 691
2016-12-02 03:00:25 C 01 47 47.48 -04 20 06.2 o 691
2016-12-02 03:10:50 C 01 47 46.70 -04 19 59.4 o 691
2016-12-02 03:30:24 C 01 47 45.09 -04 19 47.1 q G96
2016-12-02 03:36:34 C 01 47 44.59 -04 19 43.0 q G96
2016-12-02 03:42:43 C 01 47 44.08 -04 19 39.0 q G96
2016-12-02 03:48:59 C 01 47 43.63 -04 19 35.3 q G96
2016-12-04 03:21:19 C 01 44 20.98 -03 48 13.6 o 691
2016-12-04 03:33:13 C 01 44 20.11 -03 48 05.6 o 691
2016-12-04 03:45:04 C 01 44 19.24 -03 47 57.5 o 691
2016-12-05 03:39:48 C 01 42 44.70 -03 31 33.3 o 691
2016-12-05 03:58:01 C 01 42 43.40 -03 31 20.6 o 691
2016-12-05 04:16:07 C 01 42 42.17 -03 31 08.3 o 691
2016-12-06 01:29:52 C 01 41 23.15 -03 16 14.3 R G45
2016-12-06 01:36:11 C 01 41 22.71 -03 16 10.3 R G45
2016-12-06 01:36:34 C 01 41 22.73 -03 16 10.2 R G45
2016-12-06 01:43:39 C 01 41 22.24 -03 16 05.3 R G45
2016-12-06 01:50:05 C 01 41 21.82 -03 16 00.6 R G45
2016-12-06 01:50:37 C 01 41 21.77 -03 16 00.2 R G45
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)