Not to be confused with 90482 Orcus, a large trans-Neptunian object in the Kuiper belt.
21900 Orus
Shape model of Orus viewed from multiple orthogonal perspectives
Discovery[1]
Discovered by
T. Kobayashi
Discovery site
Ōizumi Obs.
Discovery date
9 November 1999
Designations
MPC designation
(21900) Orus
Pronunciation
/ˈɔːrəs/[2]
Named after
Orus (Greek mythology)[1]
Alternative designations
1999 VQ10·1998 VD18
Minor planet category
Jupiter trojan [1][3] Greek [4]· background [5]
Adjectives
Orian
Orbital characteristics[3]
Epoch 25 February 2023 (JD 2460000.5)
Uncertainty parameter 0
Earliest precovery date
8 November 1951
Aphelion
5.124 AU
Perihelion
4.930 AU
Semi-major axis
5.318 AU
Eccentricity
0.0379
Orbital period (sidereal)
11.60 yr (4,237 d)
Mean anomaly
356.275°
Mean motion
0° 5m 5.892s / day
Inclination
8.469°
Longitude of ascending node
258.554°
Argument of perihelion
181.258°
Jupiter MOID
0.0218 AU
TJupiter
2.977
Physical characteristics
Dimensions
70.7 × 63.0 × 51.4 km[6]
Mean diameter
60.5±0.9 km (area equivalent)[6]
Synodic rotation period
13.486190±0.000017 h[6]
Axial tilt
149° (wrt ecliptic)[6] 154° (wrt orbit)[6]
Pole ecliptic latitude
−59°[6]
Pole ecliptic longitude
33°[6]
Geometric albedo
0.040±0.002[6]
Spectral type
C [7][8]· D [9] B–V = 0.799±0.031[6] V–R = 0.454±0.021[6]
Absolute magnitude (H)
10.204±0.006[6]
21900 Orus/ˈɔːrəs/ is a Jupiter trojan asteroid from the Greek camp, approximately 53 kilometers (33 miles) in diameter, and a target of the Lucy mission to be visited in November 2028.[9] It is among the 100 largest Jupiter trojans and has a rotation period of 13.5 hours.[7] It was discovered on 9 November 1999, by Japanese amateur astronomer Takao Kobayashi at his private Ōizumi Observatory in Gunma Prefecture, Japan, and later named Orus after a slain Achaean warrior from the Iliad.[1]
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21900Orus /ˈɔːrəs/ is a Jupiter trojan asteroid from the Greek camp, approximately 53 kilometers (33 miles) in diameter, and a target of the Lucy mission...
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Flyby of Earth Gravity assist 11 November 2028 Lucy Flyby of asteroid 21900Orus Target altitude 1000 km 18 January 2029 JUICE Third and final gravity...
11351 Leucus 18 April 2028 (planned) 2377 days (6 yr, 6 mo, 3 d) Asteroid 21900Orus 11 November 2028 (planned) 2584 days (7 yr, 27 d) Asteroid 617 Patroclus...
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