Asteroid Radar Database
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226554 (2003 WR21)
Classification: APO [NEO, PHA]
H:19.62 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
2017 Jun Arecibo Arecibo 2380 [A]

Radar-Based Physical Properties
                 [edit]
name symbol value units uncertainty reference notes
morphology
number of components N
morphological type
spectrum-based or image-based dimensions
maximum range extent Rmax km
minimum range extent Rmin km
maximum Doppler bandwidth Bmax Hz
minimum Doppler bandwidth Bmin Hz
effective diameter Deff km
quality code for size Q
shape-based dimensions
equivalent diameter Dequ km
extent along principal axis x Ex km
extent along principal axis y Ey km
extent along principal axis z Ez km
DEEVE extent along x Dx km
DEEVE extent along y Dy km
DEEVE extent along z Dz km
surface area A km2
volume V km3
spin
spin period Pspin h
spin rate ω deg/day
YORP acceleration ω̇ deg/day2
spin axis ecliptic longitude λ deg
spin axis ecliptic latitude β deg
reflectivity
radar cross-section OC σOC km2
radar cross-section SC σSC km2
radar cross-section σT km2
projected area Aproj km2
radar albedo OC σ̂OC
radar albedo SC σ̂SC
radar albedo σ̂T
circular polarization ratio μC

Orbital Elements at Epoch 2024-03-31 00:00 TT from E2024-A65 (heliocentric ecliptic J2000)
Element Value Units
e 0.2614744
a 1.1182669 AU
i 9.26565 deg
om 85.76422 deg
w 108.10935 deg
ma 316.40109 deg
n 0.83346211 deg/d

Link to complete orbital information at Minor Planet Center

Earth Close-Approach Data (+/- 10 years)
date nominal distance RTT SNR/run at Arecibo
2016-11-14 21:24:00 0.37980 379.0 0.3
2017-06-07 19:17:00 0.12160 121.4 17.9
2023-01-09 13:59:00 0.07254 72.4 107.8
2023-09-19 00:06:00 0.43674 435.9 0.2
2024-07-22 14:57:00 0.46989 469.0 0.2
2029-11-08 09:25:00 0.40036 399.6 0.3
2030-06-20 05:07:00 0.06515 65.0 156.3

Link to complete Close-Approach Data on SBDB at JPL