Minor Planet Radar Database
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1566 Icarus (1949 MA)
Classification: APO [NEO, PHA]
H:16.9 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
1968 Jun Goldstone Goldstone 2388 [G(2388)]
1968 Jun Haystack Haystack 7840 [H(7840)]
1996 Jun Goldstone Goldstone 8510 [G]
2015 Jun Goldstone Goldstone 8560 [G]
2015 Jun Arecibo Arecibo 2380 [A]

Radar-Based Physical Properties
                 [edit]
name symbol value units uncertainty reference notes
morphology
number of components N 1 - single 1999P&SS...47..987M
morphological type
spectrum-based or image-based dimensions
maximum range extent Rmax km
minimum range extent Rmin km
maximum Doppler bandwidth Bmax 35 Hz 1999P&SS...47..987M at 8510 MHz
minimum Doppler bandwidth Bmin 25 Hz 1999P&SS...47..987M at 8510 MHz
effective diameter Deff km
quality code for size Q
shape-based dimensions
equivalent diameter Dequ 1.44 km 0.26 2017AJ....153..108G Modeled with ellipsoid
extent along principal axis x Ex 1.61 km 0.15 2017AJ....153..108G
extent along principal axis y Ey 1.6 km 0.17 2017AJ....153..108G
extent along principal axis z Ez 1.17 km 0.39 2017AJ....153..108G
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 270 deg 10 2017AJ....153..108G
spin axis ecliptic latitude β -81 deg 10 2017AJ....153..108G
reflectivity
radar cross-section OC σOC 0.022 km2 2017AJ....153..108G Freq: 2380 Date: 2015-06T
radar cross-section SC σSC 0.004 km2 2017AJ....153..108G Freq: 2380 Date: 2015-06T
radar cross-section σT 0.03 km2 0.007 2017AJ....153..108G Freq: 2380 Date: 2015-06T
projected area Aproj km2
radar albedo OC σ̂OC
radar albedo SC σ̂SC
radar albedo σ̂T 0.02 2017AJ....153..108G Freq: 2380 Date: 2015-06T
circular polarization ratio μC 0.18 0.05 2017AJ....153..108G Freq: 2380 Date: 2015-06T

Orbital Elements at Epoch 2019-04-27 00:00 TT from MPO452181 (heliocentric ecliptic J2000)
Element Value Units
e 0.8269278
a 1.0780946 AU
i 22.82647 deg
om 88.00473 deg
w 31.38078 deg
ma 199.92595 deg
n 0.8804785 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
2015-06-16 15:39:00 0.05384 53.7 371.8
2019-09-06 10:20:00 0.43882 438.0 0.2
2024-06-09 01:25:00 0.20566 205.3 3.5
2025-07-03 19:20:00 0.43763 436.8 0.2
2028-08-28 15:55:00 0.36851 367.8 0.5

Link to complete Close-Approach Data on SBDB at JPL