Asteroid Radar Database
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(2003 EP4)
Classification: APO [NEO]
H:23.93 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
2003 Mar 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 2026-06-09 00:00 TT from E2026-T09 (heliocentric ecliptic J2000)
Element Value Units
e 0.6446854
a 1.3599062 AU
i 0.5114 deg
om 212.30788 deg
w 66.48854 deg
ma 206.34037 deg
n 0.6214993 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
2017-09-08 21:08:00 0.38166 380.9 0.0
2022-03-18 15:30:00 0.15323 152.9 0.2
2028-10-30 08:56:00 0.22523 224.8 0.1
2030-02-26 19:14:00 0.28788 287.3 0.0
2036-10-10 17:13:00 0.20773 207.3 0.1

Link to complete Close-Approach Data on SBDB at JPL