(277475) 2005 WK4

Near-Earth asteroid October 2019 yes (277475) 2005 WK 4 #FFC2E0 Radar Goldstone (277475) 2005 WK4.jpg 2005 WK 4 imaged 30 times by radar at Goldstone on 8 August 2013 Siding Spring Srvy. Siding Spring Obs. 27 November 2005 (277475) 2005 WK 4 ApolloNEOPHA 4 September 2017 (JD 2458000.5) 0 8.71 yr (3,180 days) 1.2506 AU 0.7707 AU 1.0106 AU 0.2374 1.02 yr (371 days) 81.040° 0.9701 ms / day 9.8433° 138.14° 74.063° 0.0037 AU1.4 LD 0.25 0.05 kmlcdb-Benner-20130.284 km (calculated) 2.595 0.002 h2.7 0.1 hlcdb-Benner-20132.73 0.05 h 0.20 (assumed) SkS (assumed)B–V 0.677 0.025V–R 0.446 0.019V–I 0.750 0.024 20.1 (277475) 2005 WK 4 is a stony, sub-kilometer asteroid, classified as a 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 WK 4 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).2005WK4 - Background Physical characteristics 2005 WK 4 measures approximately 250 meters in diameter, and has a rotation period of 2.595 hours.lcdb-Benner-2013 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 lcdb-Benner-2013 Benner (2013): radiometric observations: mean diameter 0.25 0.05 km; rotation period 2.7 0.1 hours. Summary figures at the LCDB; also see NASA news report References 2014-08-12 last obs. JPL Small-Body Database Browser: 277475 (2005 WK4) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2277475 Jet Propulsion Laboratory 20 January 2018 277475 (2005 WK4) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=277475 20 January 2018 Asteroids and comets rotation curves – (277475) Behrend Raoul Geneva Observatory http://obswww.unige.ch/~behrend/page5cou.html#277475 20 January 2018 https://web.archive.org/web/20181111134209/http://obswww.unige.ch/~behrend/page5cou.html#277475 11 November 2018 dead 277475 20 January 2018 Stephens, Robert D. January 2014 Asteroids Observed from CS3: 2013 July–September http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2014MPBu...41...13S The Minor Planet Bulletin 41 1 13–15 1052-8091 2014MPBu...41...13S 20 January 2018 M. Hicks B. Buratt A. Carcione R. Borlase August 2013 Broadband Photometry Of The Potentially Asteroid 277475 (2005 WK4) and Corrected 52762 (1998 MT24) Colors. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013ATel.5311....1H The Astronomer's Telegram 5311 1 2013ATel.5311....1H 20 January 2018 Radar Images of Asteroid 2005 WK4 NASA https://web.archive.org/web/20210924181901/https://www.nasa.gov/mission_pages/asteroids/news/asteroid20130815.html 24 September 2021 live http://www.nasa.gov/mission_pages/asteroids/news/asteroid20130815.html#.Ug58vPJJqOI 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 https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Asteroids and comets rotation curves, CdR https://web.archive.org/web/20160729213840/http://obswww.unige.ch/~behrend/page_cou.html 29 July 2016 – Observatoire de Genève, Raoul Behrend 277475 277475 2005WK4 277475 (277475) 2005 WK 4 277475 277475 277475 277475 20130808 20051127