Asteroid Radar Database
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(2018 TR4)
Classification: APO [NEO]
H:25.05 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
2018 Oct 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 MPO714546 (heliocentric ecliptic J2000)
Element Value Units
e 0.1598652
a 1.0812229 AU
i 19.68681 deg
om 17.32717 deg
w 77.13187 deg
ma 58.01334 deg
n 0.87666009 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
2018-10-11 23:26:00 0.01757 17.5 147.3
2019-04-13 16:58:00 0.24830 247.8 0.0
2020-04-09 12:23:00 0.49513 494.1 0.0
2027-10-10 18:24:00 0.04937 49.3 4.5
2028-04-17 00:07:00 0.28444 283.9 0.0
2029-04-08 07:27:00 0.44356 442.7 0.0

Link to complete Close-Approach Data on SBDB at JPL