Asteroid Radar Database
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308242 (2005 GO21)
Classification: ATE [NEO, PHA]
H:16.27 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 Jun Goldstone Goldstone 8560 [G]
2012 Jun Arecibo Arecibo 2380 [A]
2012 Jun Arecibo Goldstone DSS-13 2380 [A-DSS13]
2012 Jun Arecibo Very Long Baseline Array 2380 [A-VLBA]
2014 Jun 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 E2024-A65 (heliocentric ecliptic J2000)
Element Value Units
e 0.3399503
a 0.7532437 AU
i 24.92707 deg
om 272.67344 deg
w 156.63059 deg
ma 222.74206 deg
n 1.50765112 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
2014-06-18 03:35:00 0.21841 218.0 16.5
2016-01-16 15:03:00 0.45899 458.1 1.2
2016-06-10 09:10:00 0.43078 429.9 1.5
2017-12-25 13:59:00 0.47382 472.9 1.1
2019-12-05 01:51:00 0.49939 498.4 0.9
2025-06-12 02:02:00 0.38752 386.7 2.2
2027-06-20 05:52:00 0.19621 195.8 24.0
2029-06-21 23:02:00 0.04654 46.5 3528.1
2031-02-07 02:27:00 0.45625 455.3 1.3
2031-06-17 23:23:00 0.23582 235.4 12.6
2033-01-14 00:45:00 0.45987 459.0 1.2
2033-06-09 22:57:00 0.45006 449.2 1.3

Link to complete Close-Approach Data on SBDB at JPL