Asteroid Radar Database
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1866 Sisyphus (1972 XA)
Classification: APO [NEO]
H:12.51 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
1985 Dec Arecibo Arecibo 2380 [A]

Radar-Based Physical Properties
name symbol value units uncertainty reference notes
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 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 0.32 0.04 2008Icar..198..294B Date: 1985T

Orbital Elements at Epoch 2024-03-31 00:00 TT from E2024-M35 (heliocentric ecliptic J2000)
Element Value Units
e 0.5380718
a 1.8938431 AU
i 41.20806 deg
om 63.45447 deg
w 293.11217 deg
ma 273.70982 deg
n 0.37817089 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
2019-06-14 06:02:00 0.45037 449.5 5.8
2032-06-15 03:21:00 0.45846 457.6 5.5
2032-11-08 20:12:00 0.46943 468.5 5.0

Link to complete Close-Approach Data on SBDB at JPL