Asteroid Radar Database
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21374 (1997 WS22)
Classification: AMO [NEO]
H:17.45 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
2014 May 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 2025-11-21 00:00 TT from MPO937633 (heliocentric ecliptic J2000)
Element Value Units
e 0.1207067
a 1.2694769 AU
i 23.97968 deg
om 59.19049 deg
w 197.34513 deg
ma 4.82549 deg
n 0.68907562 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
2024-05-21 12:50:00 0.11048 110.3 44.5
2034-05-22 04:06:00 0.14072 140.4 19.2

Link to complete Close-Approach Data on SBDB at JPL