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
2023-01-11 19:08:22 C 15 04 20.25 +78 21 13.1 M32
2023-01-11 19:08:57 C 15 04 22.04 +78 21 10.8 M32
2023-01-11 19:09:08 C 15 04 22.68 +78 21 09.6 M32
2023-01-11 19:09:21 C 15 04 23.26 +78 21 09.2 M32
2023-01-11 19:09:33 C 15 04 23.85 +78 21 08.5 M32
2023-01-11 19:09:45 C 15 04 24.51 +78 21 07.5 M32
2023-01-15 19:27:54 C 17 39 18.92 +67 51 11.1 q 168
2023-01-15 20:10:00 C 17 39 51.60 +67 46 05.1 q 168
2023-01-15 20:56:58 C 17 40 27.48 +67 40 26.0 q 168
2023-01-15 21:40:56 C 17 41 00.43 +67 35 10.2 q 168
2023-01-15 22:13:00 C 17 41 24.10 +67 31 20.5 q 168
2023-06-18 14:05:49 C 00 31 39.191 -06 50 24.57 X F52
2023-06-18 14:13:08 C 00 31 39.833 -06 50 25.00 X F52
2023-06-18 14:20:27 C 00 31 40.498 -06 50 24.66 X F52
2023-09-08 13:39:02 C 01 36 27.627 -22 18 19.89 X F51
2023-09-08 13:54:45 C 01 36 26.469 -22 18 33.55 X F51
2023-09-08 14:10:30 C 01 36 25.311 -22 18 47.25 X F51
2023-09-15 07:32:28 C 01 23 43.998 -24 33 42.80 V 703
2023-09-15 07:47:12 C 01 23 42.580 -24 33 54.36 V 703
2023-09-15 07:54:33 C 01 23 41.917 -24 33 59.80 V 703
2023-09-18 11:19:42 C 01 16 41.331 -25 29 51.69 X F52
2023-09-18 11:34:24 C 01 16 39.822 -25 30 02.13 X F52
2023-09-18 11:49:15 C 01 16 38.301 -25 30 12.48 X F52
2023-09-18 12:04:00 C 01 16 36.778 -25 30 22.82 X F52
2023-09-22 21:39:26 C 01 05 56.436 -26 37 00.84 V M22
2023-09-22 21:42:02 C 01 05 56.227 -26 37 05.05 V M22
2023-09-22 21:50:03 C 01 05 55.337 -26 37 08.98 V M22
2023-09-22 22:18:46 C 01 05 52.102 -26 37 27.08 V M22
2023-09-24 04:22:03 C 01 02 41.292 -26 53 41.24 V W68
2023-09-24 04:37:53 C 01 02 39.540 -26 53 49.52 V W68
2023-09-24 04:40:29 C 01 02 39.343 -26 53 51.32 V W68
2023-09-24 04:45:42 C 01 02 38.714 -26 53 53.23 V W68
2023-10-05 06:31:22 C 00 33 50.386 -28 14 51.61 V 703
2023-10-05 06:39:11 C 00 33 49.424 -28 14 51.18 V 703
2023-10-05 06:47:00 C 00 33 48.514 -28 14 52.04 V 703
2023-10-05 06:54:48 C 00 33 47.657 -28 14 52.15 V 703
2023-10-06 09:16:10 C 00 31 01.808 -28 16 24.10 X F51
2023-10-06 09:31:53 C 00 31 00.087 -28 16 24.78 X F51
2023-10-06 09:46:41 C 00 30 58.444 -28 16 25.38 X F51
2023-10-14 08:03:29 C 00 12 37.086 -27 54 46.49 X F51
2023-10-14 08:19:48 C 00 12 35.568 -27 54 42.47 X F51
2023-10-14 08:36:08 C 00 12 34.064 -27 54 38.31 X F51
2023-10-18 07:41:13 C 00 04 49.369 -27 24 17.75 X F51
2023-10-18 07:56:23 C 00 04 48.144 -27 24 12.10 X F51
2023-10-18 08:11:31 C 00 04 46.924 -27 24 06.39 X F51
2023-10-18 08:28:46 C 00 04 45.524 -27 23 59.90 X F51
2023-11-01 06:46:17 C 23 46 46.416 -24 23 50.68 X F51
2023-11-01 06:59:13 C 23 46 45.952 -24 23 42.21 X F51
2023-11-01 07:12:10 C 23 46 45.459 -24 23 33.79 X F51
2023-11-09 05:54:57 C 23 42 43.068 -22 08 35.53 X 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)