Minor Planet Radar Database
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(2018 EJ4)
Classification: AMO [NEO, PHA]
H:21.4 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
2018 Jun Goldstone Goldstone 8560 [G]
2018 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 2019-04-27 00:00 TT from MPO466932 (heliocentric ecliptic J2000)
Element Value Units
e 0.1834085
a 1.2569704 AU
i 10.38819 deg
om 78.10103 deg
w 188.22566 deg
ma 219.13879 deg
n 0.69938533 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
2011-05-24 19:07:00 0.14073 140.5 1.9
2014-12-23 01:49:00 0.49926 498.3 0.0
2018-06-10 19:17:00 0.01428 14.3 4748.6
2025-03-20 19:00:00 0.35201 351.3 0.1
2025-07-19 11:54:00 0.28060 280.0 0.2
2028-11-20 03:21:00 0.47414 473.2 0.0

Link to complete Close-Approach Data on SBDB at JPL