Asteroid Radar Database
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4179 Toutatis (1989 AC)
Classification: APO [NEO, PHA]
H:15.31 mag, G:0.15
Wavefront file Reference: 2003Icar..161..346H

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
1992 Nov Goldstone Goldstone 8560 [G]
1992 Nov Arecibo Arecibo 2380 [A]
1992 Nov Evpatoria Effelsberg 5010 [EV-EF(5010)]
1992 Nov Goldstone Very Large Array 8510 [G-VLA(8510)]
1996 Nov Goldstone Goldstone 8560 [G]
1996 Nov Haystack Haystack [H]
2000 Oct Goldstone Goldstone 8560 [G]
2004 Oct Arecibo Arecibo 2380 [A (PI1)]
2004 Oct Arecibo Arecibo 2380 [A (PI2)]
2008 Nov Arecibo Arecibo 2380 [A]
2012 Dec Goldstone Goldstone 8560 [G]
2012 Dec Goldstone Goldstone DSS-13 8560 [G-DSS13]
2012 Dec Goldstone Very Large Array 8560 [G-VLA]
2016 Dec Goldstone Goldstone 8560 [G]
2016 Dec Arecibo Arecibo 2380 [A]

Radar-Based Physical Properties
name symbol value units uncertainty reference notes
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 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
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 0.29 0.01 2008Icar..198..294B Date: 1996T

Orbital Elements at Epoch 2024-03-31 00:00 TT from E2024-M18 (heliocentric ecliptic J2000)
Element Value Units
e 0.6247589
a 2.543728 AU
i 0.44807 deg
om 125.35494 deg
w 277.86877 deg
ma 291.0945 deg
n 0.24293946 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
2016-12-29 14:15:00 0.25120 250.7 194.5

Link to complete Close-Approach Data on SBDB at JPL