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
2016-12-06 01:57:11 C 01 41 21.34 -03 15 55.7 R G45
2016-12-06 01:57:43 C 01 41 21.34 -03 15 55.1 R G45
2016-12-06 02:04:22 C 01 41 20.89 -03 15 50.4 R G45
2016-12-06 02:04:49 C 01 41 20.89 -03 15 50.5 R G45
2016-12-06 03:04:47 C 01 41 16.98 -03 15 06.9 o 691
2016-12-06 03:11:24 C 01 41 16.56 -03 15 02.3 o 691
2016-12-06 03:18:04 C 01 41 16.12 -03 14 57.7 o 691
2016-12-18 06:46:23 C 01 29 22.43 +00 33 40.0 o 691
2016-12-18 06:56:11 C 01 29 22.18 +00 33 48.5 o 691
2016-12-18 07:05:57 C 01 29 21.95 +00 33 56.9 o 691
2016-12-20 03:39:16 C 01 28 31.84 +01 11 48.9 o 691
2016-12-20 03:48:55 C 01 28 31.66 +01 11 57.1 o 691
2016-12-20 03:58:27 C 01 28 31.38 +01 12 05.5 o 691
2016-12-20 05:01:20 C 01 28 30.15 +01 12 58.8 o 691
2016-12-20 05:15:34 C 01 28 29.87 +01 13 11.2 o 691
2016-12-20 05:29:45 C 01 28 29.61 +01 13 23.4 o 691
2016-12-31 11:41:39 C 01 28 09.00 +05 13 32.4 q D29
2016-12-31 12:02:00 C 01 28 09.11 +05 13 49.1 q D29
2016-12-31 12:22:22 C 01 28 09.24 +05 14 09.3 q D29
2017-01-09 03:30:59 C 01 32 36.61 +08 26 55.7 q G96
2017-01-09 03:37:05 C 01 32 36.75 +08 27 01.8 q G96
2017-01-09 03:43:13 C 01 32 36.93 +08 27 07.6 q G96
2017-01-09 03:49:20 C 01 32 37.08 +08 27 13.7 q G96
2017-01-09 04:22:39 C 01 32 37.96 +08 27 44.8 o 291
2017-01-09 04:32:18 C 01 32 38.21 +08 27 54.2 o 691
2017-01-09 04:34:11 C 01 32 38.28 +08 27 55.6 o 291
2017-01-09 04:45:45 C 01 32 38.58 +08 28 06.3 o 291
2017-01-09 04:48:06 C 01 32 38.66 +08 28 08.4 o 691
2017-01-09 05:03:18 C 01 32 39.02 +08 28 22.6 o 691
2017-01-11 05:36:10 C 01 34 11.958 +09 14 24.67 L F51
2017-01-11 05:55:22 C 01 34 12.520 +09 14 42.92 L F51
2017-01-11 06:34:03 C 01 34 13.633 +09 15 19.55 L F51
2017-01-31 02:01:24 C 01 57 06.72 +16 56 53.7 q G96
2017-01-31 02:07:33 C 01 57 07.11 +16 57 00.3 q G96
2017-01-31 02:13:44 C 01 57 07.41 +16 57 06.3 q G96
2017-01-31 02:19:53 C 01 57 07.74 +16 57 11.8 q G96
2017-06-24 12:50:46 S 00 39 16.84 -15 19 15.0 L C51
2017-06-24 15:59:16 S 00 39 04.99 -15 30 06.4 L C51
2017-06-24 15:59:27 S 00 39 05.00 -15 30 05.7 L C51
2017-06-24 17:33:42 S 00 38 59.02 -15 35 30.1 L C51
2017-06-24 19:07:57 S 00 38 53.06 -15 40 55.1 L C51
2017-06-24 20:42:12 S 00 38 47.10 -15 46 18.7 L C51
2017-06-24 23:50:53 S 00 38 35.21 -15 57 06.4 L C51
2017-07-27 09:10:18 C 23 18 03.80 -47 28 23.2 o W92
2017-07-27 09:14:17 C 23 18 03.05 -47 28 28.7 o W92
2017-07-27 09:18:01 C 23 18 02.35 -47 28 33.6 o W92
2017-08-28 03:34:02 C 21 27 58.16 -50 05 36.6 q Y00
2017-08-28 04:07:47 C 21 27 55.09 -50 05 16.6 q Y00
2017-08-28 04:34:40 C 21 27 52.67 -50 05 00.2 q Y00
2017-09-21 07:07:19 C 21 10 59.888 -42 55 57.45 L F51
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)