Asteroid Radar Database
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9856 (1991 EE)
Classification: APO [NEO, PHA]
H:17.11 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
1991 Sep Arecibo Arecibo 2380 [A]
1991 Sep Goldstone Very Large Array 8510 [G-VLA(8510)]

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 0.24 0.02 2008Icar..198..294B Date: 1991T

Orbital Elements at Epoch 2024-03-31 00:00 TT from E2024-AE1 (heliocentric ecliptic J2000)
Element Value Units
e 0.6257898
a 2.2421399 AU
i 9.82982 deg
om 168.10632 deg
w 116.19134 deg
ma 255.88657 deg
n 0.29356888 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
2018-06-24 13:44:00 0.22984 229.4 2.8
2028-09-10 00:20:00 0.09671 96.5 56.6

Link to complete Close-Approach Data on SBDB at JPL