Asteroid Radar Database
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3361 Orpheus (1982 HR)
Classification: APO [NEO, PHA]
H:19.56 mag, G:0.15

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History of Radar Detections
Year Month Transmitter Receiver Frequency Obs
2017 Nov Goldstone Goldstone 8560 [G]

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 2025-05-05 00:00 TT from MPO840864 (heliocentric ecliptic J2000)
Element Value Units
e 0.3229413
a 1.2104382 AU
i 2.66208 deg
om 188.67216 deg
w 302.35442 deg
ma 172.54892 deg
n 0.74009953 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
2017-11-25 16:30:00 0.06072 60.6 50.3
2018-06-14 04:37:00 0.44832 447.4 0.1
2021-11-21 19:20:00 0.03856 38.5 239.9
2022-06-17 00:25:00 0.46160 460.7 0.0
2025-11-19 01:27:00 0.03792 37.8 254.0
2026-06-19 21:23:00 0.47295 472.0 0.0
2029-11-14 21:40:00 0.08420 84.0 16.2
2030-06-24 21:52:00 0.49271 491.7 0.0
2033-11-10 01:28:00 0.16587 165.5 1.5

Link to complete Close-Approach Data on SBDB at JPL