14827 Hypnos
14827 Hypnos (prov. designation: 1986 JK) is a highly eccentric, sub-kilometer-sized carbonaceous asteroid that is thought to be an extinct comet. It is classified as near-Earth object and potentially hazardous asteroid of the Apollo group.
| Discovery | |
|---|---|
| Discovered by | C. S. Shoemaker E. M. Shoemaker |
| Discovery site | Palomar Obs. |
| Discovery date | 5 May 1986 |
| Designations | |
MPC designation | (14827) Hypnos |
| Pronunciation | /ˈhɪpnɒs/ |
Named after | Hypnos (Greek god of sleep) |
Alternative designations | 1986 JK |
Minor planet category | Apollo · NEO · PHA |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 19.32 yr (7,058 days) |
| Aphelion | 4.7318 AU |
| Perihelion | 0.9491 AU |
Semi-major axis | 2.8405 AU |
| Eccentricity | 0.6659 |
Orbital period (sidereal) | 4.79 yr (1,749 days) |
Mean anomaly | 206.81° |
Mean motion | 0° 12m 21.24s / day |
| Inclination | 1.9808° |
Longitude of ascending node | 57.976° |
| 238.09° | |
| Earth MOID | 0.0147 AU · 5.7 LD |
| Jupiter MOID | 0.5249 AU |
| Physical characteristics | |
Mean diameter | 0.520±0.260 km >0.74 km 0.9 km (Gehrels 1994) 0.907 km (derived) |
| 0.057 (assumed) <0.067 (radar) 0.22±0.17 | |
| C B–V = 0.684 U–B = 0.492 | |
| 18.3 · 18.65±0.22 · 18.94 | |
The asteroid was discovered by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California on 5 May 1986. It was named after Hypnos, the Greek god of sleep.
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