Minor Planet Radar Database
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5143 Heracles (1991 VL)
Classification: APO [NEO]
H:14 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
2011 Dec Arecibo Arecibo 2380 [A]
2016 Nov Goldstone Goldstone 8560 [G]
2016 Nov Arecibo Arecibo 2380 [A]

Radar-Based Physical Properties
name symbol value units uncertainty reference notes
morphology
number of components N 2 - binary
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 2019-04-27 00:00 TT from MPO467693 (heliocentric ecliptic J2000)
Element Value Units
e 0.7721005
a 1.8336266 AU
i 9.02899 deg
om 309.49003 deg
w 227.8025 deg
ma 331.91178 deg
n 0.39695176 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
2011-12-11 06:53:00 0.20449 204.1 42.0
2016-11-28 23:29:00 0.14702 146.7 132.6
2021-11-18 15:46:00 0.30622 305.6 10.3
2026-11-10 15:13:00 0.46954 468.6 2.3
2029-07-26 16:47:00 0.34086 340.2 7.1

Link to complete Close-Approach Data on SBDB at JPL