Minor Planet Radar Database
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22771 (1999 CU3)
Classification: APO [NEO]
H:16.8 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
2001 Sep Arecibo Arecibo 2380 [A]
2003 Sep Arecibo Arecibo 2380 [A]
2003 Sep Goldstone Goldstone 8560 [G]
2005 Aug 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 0.28 0.02 2008Icar..198..294B Date: 2003T

Orbital Elements at Epoch 2019-04-27 00:00 TT from MPO467980 (heliocentric ecliptic J2000)
Element Value Units
e 0.5242425
a 1.5765153 AU
i 11.40093 deg
om 338.97004 deg
w 305.75669 deg
ma 340.90418 deg
n 0.49791683 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
2011-07-02 10:29:00 0.30450 303.9 2.1
2013-06-08 22:49:00 0.29598 295.4 2.3
2015-05-07 19:54:00 0.24192 241.4 4.7
2017-04-19 15:26:00 0.16360 163.3 18.5
2019-04-12 15:53:00 0.16559 165.3 17.7
2021-04-05 20:08:00 0.24777 247.3 4.3
2023-03-31 05:19:00 0.36157 360.8 1.2
2025-03-24 16:25:00 0.48145 480.5 0.4

Link to complete Close-Approach Data on SBDB at JPL