Asteroid Radar Database
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162421 (2000 ET70)
Classification: ATE [NEO, PHA]
H:18.11 mag, G:0.15
Wavefront file Reference: 2013arXiv1301.6655N

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
2012 Feb Arecibo Arecibo 2380 [A]
2012 Feb Goldstone Goldstone 8560 [G]
2012 Aug Arecibo Arecibo 2380 [A]

Radar-Based Physical Properties
name symbol value units uncertainty reference notes
number of components N 1 - single 2013Icar..226..323N
morphological type elongated
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 2.2 km
quality code for size Q
shape-based dimensions
equivalent diameter Dequ 2.239 km 5% 2013Icar..226..323N
extent along principal axis x Ex 2.557 km 5%
extent along principal axis y Ey 2.185 km 5%
extent along principal axis z Ez 2.029 km 5%
DEEVE extent along x Dx 2.521 km 5%
DEEVE extent along y Dy 2.168 km 5%
DEEVE extent along z Dz 2.054 km 5%
surface area A 16.4 km2 10%
volume V 5.879 km3 15%
spin period Pspin 8.96 h 0.02 2013Icar..226..323N
spin rate ω 964 deg/day 2
YORP acceleration ω̇ deg/day2
spin axis ecliptic longitude λ 80 deg
spin axis ecliptic latitude β -50 deg
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 0.21 0.02 2013Icar..226..323N Freq: 2380

Orbital Elements at Epoch 2024-03-31 00:00 TT from E2024-JR7 (heliocentric ecliptic J2000)
Element Value Units
e 0.1238773
a 0.9467141 AU
i 22.3218 deg
om 331.12763 deg
w 46.05022 deg
ma 177.50249 deg
n 1.06998034 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
2023-02-22 02:28:00 0.27902 278.5 1.8
2023-09-30 07:18:00 0.30819 307.6 1.3
2024-02-22 12:35:00 0.18860 188.2 7.1
2024-08-04 08:39:00 0.19787 197.5 6.0

Link to complete Close-Approach Data on SBDB at JPL