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
2010-10-14 07:08:47 C 00 44 32.02 -25 09 00.9 r 703
2010-10-14 07:17:53 C 00 44 31.09 -25 09 01.1 r 703
2010-10-22 08:28:39 C 00 26 50.448 -24 31 54.35 L F51
2010-10-22 08:44:16 C 00 26 49.091 -24 31 49.41 L F51
2011-05-28 03:34:17 C 08 22 28.70 +30 10 32.7 r G96
2011-05-28 03:41:44 C 08 22 30.21 +30 10 27.1 r G96
2011-05-28 03:49:11 C 08 22 31.65 +30 10 21.8 r G96
2011-05-28 03:56:39 C 08 22 33.13 +30 10 16.3 r G96
2016-09-30 12:49:53 C 03 53 07.106 -02 04 01.08 L F51
2016-09-30 13:05:55 C 03 53 06.877 -02 04 07.75 L F51
2016-09-30 13:38:00 C 03 53 06.432 -02 04 21.09 L F51
2016-10-10 10:39:21 C 03 47 16.72 -03 48 47.1 q 703
2016-10-10 10:56:40 C 03 47 16.11 -03 48 57.3 q 703
2016-10-10 11:05:21 C 03 47 15.74 -03 49 02.2 q 703
2016-10-22 05:37:55 C 03 30 14.31 -05 52 35.2 V G45
2016-10-22 06:59:59 C 03 30 07.33 -05 53 10.0 V G45
2016-10-22 08:15:45 C 03 30 00.84 -05 53 39.5 V G45
2016-10-22 09:36:56 C 03 29 53.92 -05 54 12.3 V G45
2016-10-23 05:24:08 C 03 28 17.12 -06 01 56.8 V G45
2016-10-23 06:43:22 C 03 28 10.14 -06 02 27.9 V G45
2016-10-23 08:08:38 C 03 28 02.59 -06 03 01.3 V G45
2016-10-23 09:26:27 C 03 27 55.63 -06 03 31.1 V G45
2016-10-23 10:47:19 C 03 27 48.42 -06 04 02.3 V G45
2016-10-23 10:47:30 C 03 27 48.39 -06 04 01.7 V G45
2016-10-23 11:38:03 C 03 27 43.95 -06 04 21.7 V G45
2016-10-23 11:38:26 C 03 27 43.90 -06 04 21.0 V G45
2016-10-23 12:19:30 C 03 27 40.27 -06 04 37.4 V G45
2016-10-23 12:21:23 C 03 27 40.14 -06 04 36.9 V G45
2016-10-24 06:10:48 C 03 26 09.77 -06 11 22.8 V G45
2016-10-24 07:21:09 C 03 26 03.34 -06 11 50.1 V G45
2016-10-24 07:25:53 C 03 26 02.85 -06 11 51.1 V G45
2016-10-24 08:23:31 C 03 25 57.56 -06 12 13.4 V G45
2016-10-24 10:38:34 C 03 25 45.05 -06 13 03.1 V G45
2016-10-26 06:38:36 C 03 21 46.70 -06 28 47.1 q H15
2016-10-26 06:52:31 C 03 21 45.37 -06 28 52.2 q H15
2016-10-26 07:07:40 C 03 21 43.72 -06 28 57.4 q H15
2016-10-29 07:40:16 C 03 14 36.97 -06 51 53.0 o 691
2016-10-29 07:47:09 C 03 14 36.24 -06 51 54.8 o 691
2016-10-29 07:54:01 C 03 14 35.47 -06 51 56.6 o 691
2016-10-30 07:11:19 C 03 12 11.01 -06 58 23.1 o 691
2016-10-30 07:17:29 C 03 12 10.35 -06 58 25.0 q G96
2016-10-30 07:24:21 C 03 12 09.59 -06 58 26.8 q G96
2016-10-30 07:27:02 C 03 12 09.28 -06 58 27.2 o 691
2016-10-30 07:30:33 C 03 12 08.90 -06 58 28.4 q G96
2016-10-30 07:36:28 C 03 12 08.24 -06 58 30.1 q G96
2016-10-30 07:42:52 C 03 12 07.55 -06 58 31.6 o 691
2016-10-30 09:55:10 C 03 11 52.91 -06 59 06.5 R G45
2016-10-30 10:02:36 C 03 11 52.09 -06 59 08.7 R G45
2016-10-30 10:09:41 C 03 11 51.31 -06 59 10.4 R G45
2016-10-30 10:16:44 C 03 11 50.54 -06 59 12.3 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)