Asteroid Radar Database
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(2019 GJ4)
Classification: ATE [NEO]
H:26.02 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
2019 Apr 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 MPO750185 (heliocentric ecliptic J2000)
Element Value Units
e 0.1677969
a 0.9868731 AU
i 6.97083 deg
om 196.15672 deg
w 252.32432 deg
ma 118.82579 deg
n 1.00533808 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
2017-04-17 19:46:00 0.36226 361.5 0.0
2018-04-10 06:36:00 0.18309 182.7 0.0
2019-04-04 23:37:00 0.00684 6.8 1269.1
2020-04-18 15:23:00 0.11170 111.5 0.1
2021-01-11 10:20:00 0.19008 189.7 0.0
2021-06-03 00:50:00 0.17748 177.1 0.0
2021-12-06 01:04:00 0.18699 186.6 0.0
2022-07-23 05:22:00 0.17730 176.9 0.0
2022-10-30 13:13:00 0.14304 142.8 0.1
2023-09-24 10:12:00 0.06727 67.1 0.8
2024-09-09 06:46:00 0.09804 97.8 0.2
2025-09-01 04:43:00 0.21245 212.0 0.0
2026-08-25 08:45:00 0.33564 335.0 0.0
2027-08-18 23:30:00 0.46017 459.3 0.0

Link to complete Close-Approach Data on SBDB at JPL