Asteroid Radar Database
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2101 Adonis (1936 CA)
Classification: APO [NEO, PHA]
H:18.72 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
1984 Jun 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
radar albedo SC σ̂SC
radar albedo σ̂T
circular polarization ratio μC 1.02 0.11 2008Icar..198..294B Date: 1984T

Orbital Elements at Epoch 2024-03-31 00:00 TT from MPO727488 (heliocentric ecliptic J2000)
Element Value Units
e 0.7642704
a 1.8739891 AU
i 1.32071 deg
om 349.4558 deg
w 43.65991 deg
ma 154.00156 deg
n 0.38419656 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
2018-02-18 14:49:00 0.21861 218.2 1.8
2020-06-19 10:14:00 0.36829 367.6 0.3
2025-08-19 18:09:00 0.41191 411.1 0.2

Link to complete Close-Approach Data on SBDB at JPL