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
2003-12-10 07:41:15 C 02 12 54.41 +01 15 38.2 o 699
2003-12-11 06:49:38 C 02 10 51.30 +01 32 11.2 r 448
2003-12-11 06:59:43 C 02 10 50.43 +01 32 18.2 r 448
2003-12-11 07:25:17 C 02 10 48.06 +01 32 37.7 r 448
2003-12-12 22:42:29 C 02 07 29.98 +02 01 32.2 r 176
2003-12-12 22:45:52 C 02 07 29.69 +02 01 34.8 r 176
2003-12-12 22:49:14 C 02 07 29.41 +02 01 37.4 r 176
2003-12-12 23:07:03 C 02 07 27.89 +02 01 51.1 r 176
2003-12-12 23:10:24 C 02 07 27.60 +02 01 53.7 r 176
2003-12-14 03:20:57 C 02 05 14.67 +02 23 19.5 18.8 c 704
2003-12-14 03:39:24 C 02 05 13.15 +02 23 33.9 19.1 c 704
2003-12-14 03:58:19 C 02 05 11.57 +02 23 48.5 19.6 c 704
2003-12-14 04:35:23 C 02 05 08.54 +02 24 16.3 19.1 c 704
2003-12-18 03:00:43 C 01 58 32.72 +03 39 19.0 o 715
2003-12-18 03:06:16 C 01 58 32.33 +03 39 23.6 o 715
2003-12-18 03:11:50 C 01 58 31.97 +03 39 28.0 o 715
2003-12-18 03:17:24 C 01 58 31.58 +03 39 32.7 o 715
2003-12-18 04:01:04 C 01 58 28.37 +03 40 06.1 r 649
2003-12-18 04:06:10 C 01 58 27.99 +03 40 10.5 r 649
2003-12-18 04:11:17 C 01 58 27.63 +03 40 14.6 r 649
2003-12-21 07:03:39 C 01 54 10.62 +04 43 02.1 20.2 c 608
2003-12-21 07:19:30 C 01 54 09.67 +04 43 15.5 19.8 c 608
2003-12-21 07:34:57 C 01 54 08.83 +04 43 27.7 20.2 c 608
2003-12-23 03:18:56 C 01 52 01.75 +05 21 03.6 18.9 c 704
2003-12-23 03:36:57 C 01 52 00.83 +05 21 19.1 19.1 c 704
2003-12-23 03:55:49 C 01 51 59.85 +05 21 35.5 18.8 c 704
2003-12-23 04:14:15 C 01 51 58.99 +05 21 51.3 19.0 c 704
2003-12-23 04:32:22 C 01 51 58.02 +05 22 07.9 18.5 c 704
2003-12-25 18:26:16 C 01 49 27.03 +06 16 37.8 r 941
2003-12-25 18:27:55 C 01 49 26.96 +06 16 39.1 r 941
2003-12-25 18:29:34 C 01 49 26.89 +06 16 40.7 r 941
2003-12-25 18:31:13 C 01 49 26.81 +06 16 42.2 r 941
2003-12-25 18:34:31 C 01 49 26.65 +06 16 45.1 r 941
2004-01-05 10:55:20 C 01 44 09.927 +10 14 26.02 r 413
2004-01-05 11:06:00 C 01 44 09.805 +10 14 35.87 r 413
2004-01-05 19:16:11 C 01 44 07.75 +10 21 57.8 r 941
2004-01-05 19:18:48 C 01 44 07.71 +10 22 00.5 r 941
2004-01-05 19:21:38 C 01 44 07.68 +10 22 03.4 r 941
2004-01-05 19:25:26 C 01 44 07.66 +10 22 06.8 r 941
2004-01-05 19:35:04 C 01 44 07.56 +10 22 15.7 r 941
2004-02-11 02:52:24 C 02 07 13.58 +25 06 39.3 d 291
2004-02-11 02:59:23 C 02 07 13.87 +25 06 47.0 d 291
2004-02-11 03:05:23 C 02 07 14.11 +25 06 53.3 d 291
2004-06-13 10:43:20 C 00 15 21.29 -06 03 41.7 c 926
2004-06-13 10:46:47 C 00 15 21.38 -06 03 47.8 c 926
2004-06-13 10:50:11 C 00 15 21.51 -06 03 53.0 c 926
2004-07-15 19:27:02 C 00 32 39.86 -24 49 37.8 r E12
2004-07-15 19:40:32 C 00 32 39.52 -24 49 58.3 r E12
2004-07-15 19:54:02 C 00 32 39.23 -24 50 19.6 r E12
2004-07-15 20:07:37 C 00 32 38.98 -24 50 39.2 r E12
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)