Global Information18493 Demoleon information
| Discovery[1] | |
|---|---|
| Discovered by | E. W. Elst |
| Discovery site | La Silla Obs. |
| Discovery date | 17 April 1996 |
| Designations | |
MPC designation | (18493) Demoleon |
| Pronunciation | /dɪˈmoʊliən/[2] |
Named after | Δημολέων Dēmoleōn[1] (Greek mythology) |
Alternative designations | 1996 HV9 · 2000 RZ31 |
Minor planet category | Jupiter trojan[1][3] Trojan[4] · background[5] |
| Orbital characteristics[3] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 28.31 yr (10,339 d) |
| Aphelion | 5.7852 AU |
| Perihelion | 4.8105 AU |
Semi-major axis | 5.2979 AU |
| Eccentricity | 0.0920 |
Orbital period (sidereal) | 12.19 yr (4,454 d) |
Mean anomaly | 210.34° |
Mean motion | 0° 4m 50.88s / day |
| Inclination | 17.198° |
Longitude of ascending node | 215.55° |
Argument of perihelion | 89.277° |
| Jupiter MOID | 0.2104 AU |
| TJupiter | 2.9020 |
| Physical characteristics | |
Mean diameter | 33.47±0.45 km[6] 40.33 km (calculated)[7] |
Synodic rotation period | 14.43±0.01 h[8][a] |
Geometric albedo | 0.057 (assumed)[7] 0.083±0.013[6] |
Spectral type | C (assumed)[7] B–V = 0.703±0.073[9] V–R = 0.395±0.047[9] V–I = 0.775±0.073[9] |
Absolute magnitude (H) | 10.70[1][3][7][6] |
18493 Demoleon (/dɪˈmoʊliən/provisional designation 1996 HV9) is a Jupiter trojan from the Trojan camp, approximately 33 kilometers (21 miles) in diameter. It was discovered by Belgian astronomer Eric Elst at ESO's La Silla Observatory in northern Chile on 17 April 1996.[1] The dark Jovian asteroid has a rotation period of 14.4 hours.[7] It was named after the Trojan warrior Demoleon from Greek mythology.[1]
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