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
2023-11-09 06:11:00 C 23 42 42.832 -22 08 23.61 X F51
2023-11-09 06:27:03 C 23 42 42.599 -22 08 11.75 X F51
2023-11-09 06:43:04 C 23 42 42.366 -22 07 59.86 X F51
2023-11-11 04:28:53 C 23 42 20.066 -21 33 31.97 V G96
2023-11-11 04:36:20 C 23 42 20.063 -21 33 25.56 V G96
2023-11-11 04:43:49 C 23 42 19.980 -21 33 20.16 V G96
2023-11-11 04:51:17 C 23 42 19.915 -21 33 14.26 V G96
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)