Minor Planet Radar Database
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1627 Ivar (1929 SH)
Classification: AMO [NEO]
H:12.7 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
1985 Jul Arecibo Arecibo 2380 [A]
2013 Jun Arecibo Arecibo 2380 [A]
2018 Jul Arecibo Arecibo 2380 [A]

Radar-Based Physical Properties
                 [edit]
name symbol value units uncertainty reference notes
morphology
number of components N 1 - single
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 4 JLM
shape-based dimensions
equivalent diameter Dequ 7.6 km 10% 2017Icar..291..254C
extent along principal axis x Ex 15.15 km 10% 2017Icar..291..254C
extent along principal axis y Ey 6.25 km 10% 2017Icar..291..254C
extent along principal axis z Ez 5.66 km 10% 2017Icar..291..254C
DEEVE extent along x Dx 15.38 km 2017Icar..291..254C
DEEVE extent along y Dy 5.8 km 2017Icar..291..254C
DEEVE extent along z Dz 4.93 km 2017Icar..291..254C
surface area A 226.19 km2 20% 2017Icar..291..254C
volume V 230.05 km3 30% 2017Icar..291..254C
spin
spin period Pspin 4.7951689 h 0.0000026 2017Icar..291..254C
spin rate ω deg/day
YORP acceleration ω̇ deg/day2
spin axis ecliptic longitude λ 336 deg 6 2017Icar..291..254C
spin axis ecliptic latitude β 37 deg 6 2017Icar..291..254C
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 0.21 0.01 2008Icar..198..294B Date: 1985T

Orbital Elements at Epoch 2020-05-31 00:00 TT from MPO502169 (heliocentric ecliptic J2000)
Element Value Units
e 0.396783
a 1.863273 AU
i 8.45187 deg
om 133.1193 deg
w 167.79347 deg
ma 256.50691 deg
n 0.38751574 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
2013-07-06 21:16:00 0.32157 320.9 29.8
2018-08-12 14:32:00 0.28400 283.4 45.9

Link to complete Close-Approach Data on SBDB at JPL