(277475) 2005 WK4, provisional designation 2005 WK4, is a stony, sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group that passed Earth within 8.2 lunar distances on 8 August 2013. It was discovered on 27 November 2005, by astronomers of the Siding Spring Survey at Siding Spring Observatory, Australia.
Description
In August 2013, 2005 WK4 was radar-imaged by the Deep Space Network dish at Goldstone Observatory, United States, and had been observed previously at Arecibo Observatory in July 2012 (this was not a close approach though).
Physical characteristics
2005 WK4 measures approximately 250 meters in diameter, and has a rotation period of 2.595 hours. Its spectral type is that of an Sk-subtype, which transitions from the stony S-type to the uncommon K-type asteroids.
See also
- List of asteroid close approaches to Earth in 2013
Notes
References
External links
- Radar images
- Radar Images of Asteroid 2005 WK4, NASA news, 15 August 2013
- Optical image, virtualtelescope.eu
- Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- (277475) 2005 WK4 at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
- (277475) 2005 WK4 at ESA–space situational awareness
- Ephemerides · Observations · Orbit · Physical properties · Summary
- (277475) 2005 WK4 at the JPL Small-Body Database
