Minor Planet Radar Database
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4544 Xanthus (1989 FB)
Classification: APO [NEO]
H:17.1 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
1990 Nov Arecibo Arecibo 2380 [A]

Radar-Based Physical Properties
                 [edit]
name symbol value units uncertainty reference notes
morphology
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
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
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 0.07 0.12 2008Icar..198..294B Date: 1990T

Orbital Elements at Epoch 2019-04-27 00:00 TT from MPO 77285 (heliocentric ecliptic J2000)
Element Value Units
e 0.2501432
a 1.0420996 AU
i 14.14526 deg
om 23.98861 deg
w 333.84249 deg
ma 301.13919 deg
n 0.92648892 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
2021-05-23 01:59:00 0.24851 248.0 11.0
2022-05-01 03:02:00 0.22366 223.2 15.9
2022-08-15 05:16:00 0.28155 281.0 7.1
2023-03-24 22:05:00 0.32860 327.9 4.2
2023-10-21 21:21:00 0.19555 195.2 25.4
2024-02-03 18:02:00 0.33488 334.2 3.9
2024-12-15 09:05:00 0.25953 259.0 9.5

Link to complete Close-Approach Data on SBDB at JPL