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Asteroid Radar Database
Return to list of asteroid radar detections
140 Siwa
Classification:
[]
H:
8.46 mag,
G:
0.15
MPC page for this object
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JPL SBDB page for this object
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ASTDyS page for this object
History of Radar Detections
Year
Month
Transmitter
Receiver
Frequency
Obs
2005
Oct
Arecibo
Arecibo
2380
[A]
Radar-Based Physical Properties
Prograde
Retrograde
[edit]
name
symbol
value
units
uncertainty
reference
notes
morphology
number of components
N
morphological type
spectrum-based or image-based dimensions
maximum range extent
R
max
km
minimum range extent
R
min
km
maximum Doppler bandwidth
B
max
Hz
minimum Doppler bandwidth
B
min
Hz
effective diameter
D
eff
km
quality code for size
Q
shape-based dimensions
equivalent diameter
D
equ
km
extent along principal axis x
E
x
km
extent along principal axis y
E
y
km
extent along principal axis z
E
z
km
DEEVE extent along x
D
x
km
DEEVE extent along y
D
y
km
DEEVE extent along z
D
z
km
surface area
A
km
2
volume
V
km
3
spin
spin period
P
spin
h
spin rate
ω
deg/day
YORP acceleration
ω̇
deg/day
2
spin axis ecliptic longitude
λ
deg
spin axis ecliptic latitude
β
deg
reflectivity
radar cross-section OC
σ
OC
km
2
radar cross-section SC
σ
SC
km
2
radar cross-section
σ
T
km
2
projected area
A
proj
km
2
radar albedo OC
σ̂
OC
radar albedo SC
σ̂
SC
radar albedo
σ̂
T
circular polarization ratio
μ
C
Orbital Elements at Epoch 2025-05-05 00:00 TT from E2025-HI7 (heliocentric ecliptic J2000)
Element
Value
Units
e
0.2173238
a
2.7319918
AU
i
3.19101
deg
om
107.07401
deg
w
197.1503
deg
ma
177.65937
deg
n
0.21826545
deg/d
Link to complete orbital information at Minor Planet Center