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
2023-01-08 20:19:38 C 11 10 14.65 +77 04 43.5 V C40
2023-01-08 20:25:59 C 11 10 30.68 +77 05 22.2 V C40
2023-01-08 20:29:30 C 11 10 39.53 +77 05 43.7 V C40
2023-01-08 20:29:50 C 11 10 40.35 +77 05 45.8 V C40
2023-01-08 20:30:12 C 11 10 41.25 +77 05 47.8 V C40
2023-01-08 20:31:57 C 11 10 45.68 +77 05 58.5 V C40
2023-01-08 20:38:41 C 11 11 02.61 +77 06 39.5 V C40
2023-01-08 20:39:22 C 11 11 04.37 +77 06 43.5 V C40
2023-01-08 20:40:26 C 11 11 07.03 +77 06 50.0 V C40
2023-01-08 20:46:07 C 11 11 21.28 +77 07 24.4 V C40
2023-01-08 20:47:30 C 11 11 24.80 +77 07 32.8 V C40
2023-01-08 20:48:55 C 11 11 28.31 +77 07 41.5 V C40
2023-01-08 20:52:08 C 11 11 36.41 +77 08 01.0 V C40
2023-01-08 20:52:28 C 11 11 37.35 +77 08 03.3 V C40
2023-01-08 20:55:18 C 11 11 44.48 +77 08 20.1 V C40
2023-01-08 20:57:25 C 11 11 49.82 +77 08 32.7 V C40
2023-01-08 20:57:46 C 11 11 50.67 +77 08 34.9 V C40
2023-01-08 20:58:07 C 11 11 51.50 +77 08 37.1 V C40
2023-01-08 20:58:29 C 11 11 52.46 +77 08 39.4 V C40
2023-01-08 21:00:57 C 11 11 58.63 +77 08 54.0 V C40
2023-01-08 21:02:00 C 11 12 01.30 +77 09 00.4 V C40
2023-01-08 21:02:20 C 11 12 02.20 +77 09 02.4 V C40
2023-01-08 21:03:46 C 11 12 05.75 +77 09 11.1 V C40
2023-01-08 21:11:52 C 11 12 26.25 +77 09 59.6 V C40
2023-01-08 21:12:14 C 11 12 27.15 +77 10 02.0 V C40
2023-01-08 21:12:35 C 11 12 27.97 +77 10 04.0 V C40
2023-01-08 21:13:16 C 11 12 29.71 +77 10 08.1 V C40
2023-01-08 21:16:48 C 11 12 38.65 +77 10 29.1 V C40
2023-01-08 21:21:43 C 11 12 51.08 +77 10 58.4 V C40
2023-01-08 21:22:26 C 11 12 52.90 +77 11 02.7 V C40
2023-01-08 21:22:47 C 11 12 53.76 +77 11 04.8 V C40
2023-01-08 21:23:51 C 11 12 56.39 +77 11 11.2 V C40
2023-01-08 21:26:21 C 11 13 02.70 +77 11 25.9 V C40
2023-01-11 19:02:26 C 15 04 01.71 +78 21 35.3 M32
2023-01-11 19:02:38 C 15 04 02.23 +78 21 34.8 M32
2023-01-11 19:03:25 C 15 04 04.73 +78 21 32.2 M32
2023-01-11 19:03:37 C 15 04 05.40 +78 21 30.9 M32
2023-01-11 19:03:48 C 15 04 05.98 +78 21 30.1 M32
2023-01-11 19:03:59 C 15 04 06.58 +78 21 30.0 M32
2023-01-11 19:04:11 C 15 04 07.15 +78 21 29.1 M32
2023-01-11 19:04:47 C 15 04 09.02 +78 21 26.6 M32
2023-01-11 19:04:59 C 15 04 09.62 +78 21 26.1 M32
2023-01-11 19:05:11 C 15 04 10.21 +78 21 25.4 M32
2023-01-11 19:05:33 C 15 04 11.44 +78 21 23.6 M32
2023-01-11 19:05:45 C 15 04 12.02 +78 21 22.5 M32
2023-01-11 19:06:10 C 15 04 13.29 +78 21 21.4 M32
2023-01-11 19:07:00 C 15 04 15.90 +78 21 18.2 M32
2023-01-11 19:07:11 C 15 04 16.49 +78 21 17.4 M32
2023-01-11 19:07:58 C 15 04 18.93 +78 21 14.1 M32
2023-01-11 19:08:10 C 15 04 19.60 +78 21 13.0 M32
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)