Asteroid Radar Database
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3361 Orpheus (1982 HR)
Classification: APO [NEO, PHA]
H:19.21 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
2017 Nov Goldstone Goldstone 8560 [G]

Radar-Based Physical Properties
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Orbital Elements at Epoch 2021-07-05 00:00 TT from MPO647051 (heliocentric ecliptic J2000)
Element Value Units
e 0.3229947
a 1.2103832 AU
i 2.67793 deg
om 189.1504 deg
w 301.9387 deg
ma 216.32337 deg
n 0.74015 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
2013-12-07 00:11:00 0.10316 103.0 8.0
2014-06-09 19:36:00 0.42708 426.2 0.1
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 37.8 253.9
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

Link to complete Close-Approach Data on SBDB at JPL