Asteroid Radar Database
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4581 Asclepius (1989 FC)
Classification: APO [NEO, PHA]
H:20.74 mag, G:0.15

  MPC page for this object   |  JPL SBDB page for this object   |  NEODyS-2 page for this object   |  ESA SSA page for this object  

History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
2012 Aug 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

Orbital Elements at Epoch 2024-03-31 00:00 TT from MPO727528 (heliocentric ecliptic J2000)
Element Value Units
e 0.3569687
a 1.0225706 AU
i 4.91788 deg
om 180.20371 deg
w 255.3656 deg
ma 21.50023 deg
n 0.95315631 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
2014-07-22 12:27:00 0.28595 285.4 0.3
2014-10-17 11:17:00 0.27325 272.7 0.3
2015-06-27 11:00:00 0.36231 361.6 0.1
2015-11-19 12:21:00 0.32645 325.8 0.2
2016-06-06 10:25:00 0.38544 384.7 0.1
2016-12-17 11:19:00 0.33118 330.5 0.2
2017-05-17 20:36:00 0.36440 363.7 0.1
2018-01-18 08:05:00 0.28900 288.4 0.2
2018-04-24 20:57:00 0.29302 292.4 0.2
2019-03-22 09:01:00 0.13810 137.8 3.3
2020-03-25 14:45:00 0.07047 70.3 34.5
2021-04-03 22:10:00 0.28096 280.4 0.3
2022-04-13 14:29:00 0.48649 485.5 0.0

Link to complete Close-Approach Data on SBDB at JPL