 Orbit of2001 SL9 | |
| Discovery[1][2] | |
|---|---|
| Discovered by | NEAT |
| Discovery site | Palomar Obs. |
| Discovery date | 18 September 2001 |
| Designations | |
| 2001 SL9 | |
| Orbital characteristics[1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 22318 days (61.10 yr) |
| Aphelion | 1.3480 AU (201.66 Gm) |
| Perihelion | 0.77471 AU (115.895 Gm) |
| 1.0613 AU (158.77 Gm) | |
| Eccentricity | 0.27006 |
| 1.09yr (399.37d) | |
| 239.06° | |
| 0° 54m 5.112s / day | |
| Inclination | 21.900° |
| 202.86° | |
| 329.30° | |
| Knownsatellites | 1 |
| Earth MOID | 0.197987 AU (29.6184 Gm) |
| Jupiter MOID | 3.64009 AU (544.550 Gm) |
| Physical characteristics | |
| 1 km (0.62 mi)[3] | |
| Mass | 109mt |
Meandensity | 1.8 g/cm3[2] |
Equatorialsurface gravity | 0.02565 mm/s2[4] |
Equatorialescape velocity | 0.05116 mm/s[4] |
| 2.4004 h (0.10002 d) | |
| 2.40035±0.00005 hours[1][5] | |
| 0.16[2] | |
| Temperature | 230-303 K (-43-30°C)[4] |
| 17.6[1] | |
(88710) 2001 SL9 (provisional designation2001 SL9) is a sub-kilometerasteroid andbinary system, classified asnear-Earth object ofApollo group[1] discovered byNEAT atPalomar Observatory on 18 September 2001. It measures approximately 960 meters in diameter, while its 2001-discoveredminor-planet moon has an estimated diameter of 200 meters based on a secondary to primary size ratio of 0.28.[2]
Although2001 SL9 is classified as anear-Earth object, it does not pose any threats. It has never, nor will it ever in the next century, come closer than 15,000,000 km (0.1 AU) fromEarth orVenus.[1] However, the asteroid would make a good target for aspacecraft flyby, as a flyby to2001 SL9 would only require adelta-v of 5.4 km/s.[6]
2001 SL9 has oneminor-planet moon. It was discovered fromlightcurve observations[6] made by Czech astronomerPetr Pravec and collaborators.[2] This moon is approximately 200 m (660 ft) in diameter. Its semi-major axis is 1.6 km (0.99 mi) and its orbital period is 16.4 hours.[2]
