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
2004-08-06 14:08:19 C 00 04 31.00 -37 45 36.1 r E17
2004-08-06 14:14:36 C 00 04 30.13 -37 45 43.9 r E17
2004-08-06 14:20:53 C 00 04 29.15 -37 45 50.8 r E17
2004-08-23 13:12:51 C 23 14 24.76 -43 55 36.1 r E12
2004-08-23 13:26:21 C 23 14 22.93 -43 55 42.7 r E12
2004-08-23 13:39:51 C 23 14 20.97 -43 55 49.0 r E12
2004-08-23 13:53:23 C 23 14 19.05 -43 55 55.5 r E12
2004-08-25 14:42:55 C 23 07 44.10 -44 14 53.2 r E12
2004-08-25 14:56:36 C 23 07 42.11 -44 14 57.6 r E12
2004-08-25 15:10:16 C 23 07 40.10 -44 15 02.6 r E12
2004-08-25 15:23:54 C 23 07 38.15 -44 15 06.9 r E12
2004-08-29 13:28:38 C 22 55 19.58 -44 35 39.7 c 474
2004-08-29 13:30:49 C 22 55 19.17 -44 35 40.1 c 474
2004-08-29 13:35:09 C 22 55 18.63 -44 35 40.7 c 474
2004-08-29 13:41:38 C 22 55 17.71 -44 35 41.4 c 474
2004-09-09 15:36:57 C 22 25 46.15 -43 57 22.4 r E12
2004-09-09 15:56:11 C 22 25 44.23 -43 57 14.3 r E12
2004-09-09 16:15:23 C 22 25 42.38 -43 57 05.2 r E12
2004-09-09 16:34:35 C 22 25 40.59 -43 56 58.5 r E12
2009-11-20 09:00:51 C 07 59 49.79 +13 34 41.5 19.8 c 704
2009-11-20 09:18:38 C 07 59 51.82 +13 34 46.8 19.1 c 704
2009-11-20 09:36:25 C 07 59 53.76 +13 34 50.8 19.8 c 704
2009-11-20 09:54:12 C 07 59 55.78 +13 34 53.2 19.9 c 704
2009-11-22 06:55:04 C 08 05 18.85 +13 47 51.6 r 932
2009-11-22 07:02:15 C 08 05 19.67 +13 47 54.6 r 932
2009-11-22 07:09:26 C 08 05 20.52 +13 47 56.5 r 932
2009-11-26 09:15:12 C 08 17 45.60 +14 22 39.0 r 703
2009-11-26 09:39:20 C 08 17 48.58 +14 22 48.5 r 703
2009-11-26 09:51:33 C 08 17 50.13 +14 22 54.3 r 703
2009-12-10 09:11:13 C 09 12 18.57 +17 50 54.0 r 703
2009-12-10 09:21:04 C 09 12 20.48 +17 51 02.8 r 703
2009-12-10 09:30:56 C 09 12 22.42 +17 51 12.0 r 703
2009-12-10 09:40:32 C 09 12 24.30 +17 51 20.7 r 703
2009-12-15 09:11:30 C 09 39 39.86 +19 50 16.5 18.1 c 704
2009-12-15 09:30:00 C 09 39 44.40 +19 50 37.7 18.1 c 704
2009-12-15 09:48:31 C 09 39 48.90 +19 50 58.5 18.1 c 704
2009-12-15 10:07:06 C 09 39 53.34 +19 51 19.4 18.5 c 704
2009-12-15 10:25:34 C 09 39 57.94 +19 51 40.4 18.2 c 704
2010-01-06 11:06:57 C 13 29 24.30 +28 12 42.4 18.4 c 704
2010-01-06 11:25:10 C 13 29 34.59 +28 12 37.6 17.9 c 704
2010-01-06 11:43:23 C 13 29 44.79 +28 12 31.9 18.1 c 704
2010-01-06 12:01:35 C 13 29 54.99 +28 12 26.4 17.9 c 704
2010-01-07 09:53:43 S 13 42 30.113 +28 02 30.01 L C51
2010-01-07 19:25:19 S 13 47 57.576 +27 56 50.17 L C51
2010-01-07 21:00:41 S 13 48 52.070 +27 55 49.55 L C51
2010-01-08 01:46:22 S 13 51 34.992 +27 52 37.99 L C51
2010-10-12 09:22:53 C 00 49 12.484 -25 09 35.84 L F51
2010-10-12 09:38:47 C 00 49 10.727 -25 09 36.32 L F51
2010-10-14 06:47:25 C 00 44 34.22 -25 09 02.6 r 703
2010-10-14 06:59:38 C 00 44 32.89 -25 09 02.5 r 703
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)