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
2017-09-21 07:18:28 C 21 10 59.947 -42 55 48.33 – L F51
2017-09-21 07:29:40 C 21 10 59.995 -42 55 39.18 – L F51
2017-09-21 07:40:48 C 21 11 00.043 -42 55 30.08 – L F51
2022-09-01 14:39:27 C 04 42 11.497 +10 38 17.91 – U F52
2022-09-01 14:53:16 C 04 42 12.693 +10 38 19.09 – U F52
2022-09-01 15:07:11 C 04 42 13.901 +10 38 20.19 – U F52
2022-11-16 12:20:47 C 07 01 58.609 +11 52 46.38 – V G96
2022-11-16 12:29:36 C 07 01 59.120 +11 52 48.94 – V G96
2022-11-16 12:38:25 C 07 01 59.552 +11 52 51.13 – V G96
2022-11-16 12:47:15 C 07 02 00.028 +11 52 53.58 – V G96
2022-11-23 14:00:44 C 07 11 41.018 +12 56 42.22 – V T08
2022-11-23 14:51:36 C 07 11 43.430 +12 57 06.19 – V T08
2022-11-23 14:55:53 C 07 11 43.620 +12 57 08.46 – V T08
2022-11-23 15:32:06 C 07 11 45.391 +12 57 25.63 – V T08
2022-11-25 12:23:21 C 07 14 14.342 +13 20 52.62 – V T05
2022-11-25 12:25:57 C 07 14 14.455 +13 20 53.77 – V T05
2022-11-25 12:30:32 C 07 14 14.683 +13 20 56.58 – V T05
2022-11-25 12:38:20 C 07 14 15.031 +13 21 00.90 – V T05
2022-11-26 12:38:18 C 07 15 32.969 +13 34 56.14 – V T05
2022-11-26 12:42:51 C 07 15 33.166 +13 34 59.16 – V T05
2022-11-26 13:19:55 C 07 15 34.877 +13 35 21.44 – V T05
2022-11-26 13:33:20 C 07 15 35.467 +13 35 29.80 – V T05
2022-11-27 07:17:19 C 07 16 34.093 +13 46 19.92 – V 703
2022-11-27 07:25:00 C 07 16 34.432 +13 46 25.25 – V 703
2022-11-27 07:32:41 C 07 16 34.828 +13 46 30.32 – V 703
2022-11-27 07:40:23 C 07 16 35.216 +13 46 35.94 – V 703
2022-11-29 09:17:32 C 07 19 13.048 +14 20 36.13 – V G96
2022-11-29 09:25:03 C 07 19 13.379 +14 20 41.71 – V G96
2022-11-29 09:32:35 C 07 19 13.724 +14 20 47.36 – V G96
2022-11-29 09:40:09 C 07 19 14.056 +14 20 52.91 – V G96
2022-11-30 09:54:57 C 07 20 31.016 +14 39 21.14 – V U68
2022-11-30 09:59:45 C 07 20 31.244 +14 39 25.27 – V U68
2022-11-30 10:14:56 C 07 20 31.893 +14 39 36.88 – V U68
2022-11-30 10:19:45 C 07 20 32.123 +14 39 40.96 – V U68
2022-11-30 12:31:14 C 07 20 39.218 +14 41 35.09 – V T05
2022-11-30 13:09:51 C 07 20 40.898 +14 42 06.05 – V T05
2022-11-30 13:17:11 C 07 20 41.215 +14 42 11.95 – V T05
2022-12-05 19:11:14 C 07 27 16.84 +16 43 20.8 – V D29
2022-12-05 19:31:36 C 07 27 17.70 +16 43 43.9 – V D29
2022-12-05 19:51:57 C 07 27 18.56 +16 44 07.0 – V D29
2022-12-17 17:50:26 C 07 43 26.96 +25 17 54.8 – V D29
2022-12-17 18:10:47 C 07 43 27.95 +25 18 49.2 – V D29
2022-12-17 18:31:09 C 07 43 28.94 +25 19 43.5 – V D29
2022-12-17 22:04:41 C 07 43 45.79 +25 28 59.9 – X K19
2022-12-17 22:09:59 C 07 43 46.10 +25 29 14.1 – X K19
2022-12-17 22:15:18 C 07 43 46.37 +25 29 28.8 – X K19
2022-12-19 09:00:42 C 07 46 04.534 +27 09 02.45 – V 703
2022-12-19 09:08:50 C 07 46 04.962 +27 09 27.36 – V 703
2022-12-19 09:16:59 C 07 46 05.372 +27 09 51.88 – V 703
2022-12-19 09:25:05 C 07 46 05.812 +27 10 16.28 – V 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)