Minor Planet Radar Database
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1685 Toro (1948 OA)
Classification: APO [NEO]
H:14.23 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
1972 Aug Goldstone Goldstone 2380 [G(2380)]
1980 Jul Arecibo Arecibo 2380 [A]
1988 Jul Arecibo Arecibo 2380 [A]
2012 Jul Arecibo Arecibo 2380 [A]
2016 Jan Goldstone Goldstone 8560 [G]

Radar-Based Physical Properties
                 [edit]
name symbol value units uncertainty reference notes
morphology
number of components N 1 - single 1983AJ.....88..565O
morphological type elongated 1983AJ.....88..565O
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 3.3 km 1983AJ.....88..565O
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 10.176 h 1983AJ.....88..565O
spin rate ω 849.057 deg/day Calculated (360*24/Pspin)
YORP acceleration ω̇ deg/day2
spin axis ecliptic longitude λ 200 deg 30 1983AJ.....88..565O
spin axis ecliptic latitude β 55 deg 7 1983AJ.....88..565O
reflectivity
radar cross-section OC σOC 1.62 km2 0.41 1983AJ.....88..565O Freq: 2380 Date: 1988-07-25T
radar cross-section SC σSC 0.26 km2 0.09 1983AJ.....88..565O Freq: 2380
radar cross-section σT km2
projected area Aproj km2
radar albedo OC σ̂OC
radar albedo SC σ̂SC
radar albedo σ̂T
circular polarization ratio μC 0.15 0.05 2008Icar..198..294B Date: 1980T

Orbital Elements at Epoch 2019-04-27 00:00 TT from MPO452183 (heliocentric ecliptic J2000)
Element Value Units
e 0.4360614
a 1.367432 AU
i 9.38341 deg
om 274.24583 deg
w 127.22061 deg
ma 43.6921 deg
n 0.61637565 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
2012-07-28 22:16:00 0.30171 301.1 12.3
2016-01-22 07:07:00 0.15655 156.2 121.7
2020-07-27 13:22:00 0.33116 330.5 8.9
2024-01-20 20:46:00 0.13306 132.8 214.3
2028-07-26 22:59:00 0.34393 343.2 7.8

Link to complete Close-Approach Data on SBDB at JPL