Minor Planet Radar Database
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66391 (1999 KW4)
Classification: ATE [NEO, PHA]
H:16.6 mag, G:0.15
Wavefront file Reference: 2006Sci...314.1276O

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
2001 May Goldstone Goldstone 8560 [G]
2001 May Arecibo Arecibo 2380 [A]
2001 May Arecibo Goldstone 2380 [A-G]
2002 Jun Arecibo Arecibo 2380 [A]
2017 May Arecibo Arecibo 2380 [A]
2018 May Arecibo Arecibo 2380 [A]
2018 May Goldstone Goldstone 8560 [G]
2019 May Arecibo Arecibo 2380 [A]

Radar-Based Physical Properties
name symbol value units uncertainty reference notes
morphology
number of components N 2 - binary 2006Sci...314.1276O
morphological type multiple
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 1.317 km 3% 2006Sci...314.1276O
extent along principal axis x Ex 1.532 km 3% 2006Sci...314.1276O
extent along principal axis y Ey 1.495 km 3% 2006Sci...314.1276O
extent along principal axis z Ez 1.347 km 3% 2006Sci...314.1276O
DEEVE extent along x Dx 1.417 km 3% 2006Sci...314.1276O
DEEVE extent along y Dy 1.361 km 3% 2006Sci...314.1276O
DEEVE extent along z Dz 1.183 km 3% 2006Sci...314.1276O
surface area A 5.744 km2 6% 2006Sci...314.1276O
volume V 1.195 km3 9% 2006Sci...314.1276O
spin
spin period Pspin 2.7645 h 0.0003 2006Sci...314.1276O
spin rate ω deg/day
YORP acceleration ω̇ deg/day2
spin axis ecliptic longitude λ 326 deg 3 2006Sci...314.1276O
spin axis ecliptic latitude β -65 deg 3 2006Sci...314.1276O
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 0.45 0.10 2006Sci...314.1276O Date: 2001T

Orbital Elements at Epoch 2019-04-27 00:00 TT from MPO468590 (heliocentric ecliptic J2000)
Element Value Units
e 0.6887198
a 0.6421962 AU
i 38.8826 deg
om 244.9096 deg
w 192.6185 deg
ma 68.08602 deg
n 1.91514866 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
2014-06-07 08:40:00 0.41674 415.9 0.5
2015-06-08 07:30:00 0.32438 323.7 1.2
2016-06-04 23:47:00 0.24477 244.3 3.2
2017-05-31 14:55:00 0.16731 167.0 12.1
2018-05-27 13:23:00 0.07818 78.0 170.6
2019-05-25 23:05:00 0.03464 34.6 2816.8
2020-05-26 17:20:00 0.15983 159.5 14.2
2021-05-31 02:48:00 0.29617 295.6 1.6
2022-06-06 01:34:00 0.43559 434.7 0.4

Link to complete Close-Approach Data on SBDB at JPL