Asteroid Radar Database
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2 Pallas
Classification:  []
H:4.24 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
1982 Mar Arecibo Arecibo 2380 [A]
1987 Apr Arecibo Arecibo 2380 [A]
1991 Apr Arecibo Arecibo 2380 [A]
2000 Apr Arecibo Arecibo 2380 [A]
2005 Apr Arecibo Arecibo 2380 [A]

Radar-Based Physical Properties
name symbol value units uncertainty reference notes
number of components N
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 0.075 .011 1996Icar..124..113M Freq: 2380
radar albedo SC σ̂SC
radar albedo σ̂T
circular polarization ratio μC 0.05 .03 1996Icar..124..113M Freq: 8560

Orbital Elements at Epoch 2022-01-21 00:00 TT from MPO660785 (heliocentric ecliptic J2000)
Element Value Units
e 0.229993
a 2.7711069 AU
i 34.92531 deg
om 172.91658 deg
w 310.69724 deg
ma 272.47992 deg
n 0.21366046 deg/d

Link to complete orbital information at Minor Planet Center