Asteroid Radar Database
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7 Iris
Classification:  []
H:5.67 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
1980 Sep Arecibo Arecibo 2380 [A]
1984 Dec Arecibo Arecibo 2380 [A]
1991 Sep Goldstone Goldstone 8560 [G]
1991 Sep Goldstone Very Large Array 8510 [G-VLA(8510)]
1995 Nov Goldstone Goldstone 8560 [G]
2000 Jan Arecibo Arecibo 2380 [A]
2006 Nov Arecibo Arecibo 2380 [A]

Radar-Based Physical Properties
                 [edit]
name symbol value units uncertainty reference notes
morphology
number of components N 1 - single 2010Icar..207..285O
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 208 km 35 2010Icar..207..285O
extent along principal axis x Ex 253 km 38 2010Icar..207..285O
extent along principal axis y Ey 228 km 34 2010Icar..207..285O
extent along principal axis z Ez 193 km 39 2010Icar..207..285O
DEEVE extent along x Dx km
DEEVE extent along y Dy km
DEEVE extent along z Dz km
surface area A km2
volume V 4700000 km3 2300000 2010Icar..207..285O
spin
spin period Pspin 7.1388 h 0.0001 2010Icar..207..285O
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 2025-05-05 00:00 TT from MPO901161 (heliocentric ecliptic J2000)
Element Value Units
e 0.2299781
a 2.3863214 AU
i 5.51956 deg
om 259.49837 deg
w 145.52919 deg
ma 8.23526 deg
n 0.26736877 deg/d

Link to complete orbital information at Minor Planet Center