Astronomy:(549948) 2011 WL2
| Discovery[1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Laboratory ETS |
| Discovery date | 16 November 2011 |
| Designations | |
| (549948) 2011 WL2 | |
| 2011 WL2 | |
| Minor planet category | Apollo  NEO, PHA |
| Orbital characteristics[2] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 2 | |
| Observation arc | 386 days (1.06 yr) |
| |{{{apsis}}}|helion}} | 1.3833510 astronomical unit|AU (206.94636 Gm) |
| |{{{apsis}}}|helion}} | 0.7723798 AU (115.54637 Gm) |
| 1.0778654 AU (161.24637 Gm) | |
| Eccentricity | 0.283417 |
| Orbital period | 1.12 yr (408.74 d) |
| Average Orbital speed | 28.10406 km/s |
| Mean anomaly | 336.9187° |
| Mean motion | 0° 52m 50.734s /day |
| Inclination | 14.12974° |
| Longitude of ascending node | 212.9462° |
| 88.83006° | |
| Earth MOID | 0.00141998 AU (212,426 km) |
| Jupiter MOID | 3.83997 AU (574.451 Gm) |
| Physical characteristics | |
| Mean diameter | 190–420 m[3] |
| Absolute magnitude (H) | 20.8[2] |
(549948) 2011 WL2 is a sub-kilometer asteroid, classified as a near-Earth object and potentially hazardous asteroid of the Apollo group. It was discovered on 16 November 2011, by astronomers with the LINEAR at the Lincoln Laboratory ETS near Socorro, New Mexico, in the United States.
Orbit
2011 WL2 is a potentially hazardous asteroid (PHA), but has a well determined orbit with a 10 year observation arc. 2011 WL2 will pass at a distance of 0.0056 AU (840,000 km; 520,000 mi) from Earth on 25 October 2077.[2] For comparison, the distance to the Moon is about 0.0026 AU (384,400 km). 2011 WL2 appears on the list of PHA close approaches issued by the Minor Planet Center (MPC), with the next close approach in the year 2038.[4]
The Jupiter Tisserand invariant, used to distinguish different kinds of orbits, is 5.7.[2]
References
- ↑ "2011 WL2". Minor Planet Center. 2012-12-06. http://www.minorplanetcenter.net/db_search/show_object?object_id=549948.
- ↑ 2.0 2.1 2.2 2.3 "JPL Small-Body Database Browser: 2011 WL2)". Jet Propulsion Laboratory. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011%20WL2;old=0;orb=0;cov=0;log=0;cad=1#cad. Retrieved 1 April 2016.
- ↑ "ABSOLUTE MAGNITUDE (H)". NASA. http://neo.jpl.nasa.gov/glossary/h.html.
- ↑ "PHA Close Approaches To The Earth". Minor Planet Center. http://www.minorplanetcenter.net/iau/lists/PHACloseApp.html. Retrieved 2015-05-29.
External links
- (549948) 2011 WL2 at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
- (549948) 2011 WL2 at ESA–space situational awareness
- (549948) 2011 WL2 at the JPL Small-Body Database
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