Asteroid Radar Database
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(2011 TB4)
Classification: APO [NEO]
H:25.4 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
2014 Oct Goldstone Goldstone 8560 [G]

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 MPO315266 (heliocentric ecliptic J2000)
Element Value Units
e 0.4557407
a 1.306684 AU
i 6.72976 deg
om 11.4617 deg
w 91.01812 deg
ma 121.2707 deg
n 0.65985455 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
2017-10-06 07:47:00 0.06503 64.9 1.4
2020-10-02 05:22:00 0.13717 136.9 0.1
2023-09-28 21:43:00 0.21795 217.5 0.0
2026-09-24 21:17:00 0.29499 294.4 0.0
2029-09-20 14:41:00 0.37795 377.2 0.0
2032-09-16 10:15:00 0.45917 458.3 0.0

Link to complete Close-Approach Data on SBDB at JPL