Asteroid Radar Database
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1620 Geographos (1951 RA)
Classification: APO [NEO, PHA]
H:15.27 mag, G:0.15
Wavefront file Reference: 1999Icar..140..369H

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
1983 Feb Arecibo Arecibo 2380 [A]
1994 Aug Goldstone Goldstone 8560 [G]

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 0.2 0.01 2008Icar..198..294B Date: 1994T

Orbital Elements at Epoch 2024-03-31 00:00 TT from E2024-BE5 (heliocentric ecliptic J2000)
Element Value Units
e 0.3355106
a 1.2457528 AU
i 13.33496 deg
om 337.16343 deg
w 276.97699 deg
ma 147.60116 deg
n 0.70885315 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
2015-03-07 09:37:00 0.23842 237.9 13.1
2019-08-31 17:20:00 0.13726 137.0 89.9
2026-02-09 02:21:00 0.47293 472.0 1.2
2026-08-12 08:35:00 0.17044 170.1 42.3
2033-03-14 23:04:00 0.24539 244.9 11.9
2033-09-23 08:08:00 0.45480 453.9 1.4

Link to complete Close-Approach Data on SBDB at JPL