Minor Planet Radar Database
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171576 (1999 VP11)
Classification: APO [NEO, PHA]
H:18.6 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
2017 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 2020-05-31 00:00 TT from MPO469836 (heliocentric ecliptic J2000)
Element Value Units
e 0.5835759
a 1.0857036 AU
i 17.2797 deg
om 208.10484 deg
w 61.72508 deg
ma 157.35312 deg
n 0.87123869 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
2014-02-20 20:44:00 0.27058 270.0 0.8
2017-10-22 11:02:00 0.01483 14.8 17208.7
2023-03-09 22:12:00 0.25933 258.8 0.9
2025-08-27 21:29:00 0.48015 479.2 0.1
2025-10-28 03:20:00 0.44856 447.7 0.1
2026-11-04 00:24:00 0.31645 315.8 0.5

Link to complete Close-Approach Data on SBDB at JPL