(436724) 2011 UW158

Stony, walnut-shaped asteroid and fast rotator September 2020 yes (436724) 2011 UW 158 #FFC2E0 2011UW158.jul14.p05us.p27Hz(1).gif Animation of Arecibo radar images of 2011 UW 158 padding: 5px 0; 25 October 2011 Pan-STARRS 1 Haleakala Obs. (436724) 2011 UW 158 ApolloNEOPHA 4 September 2017 (JD 2458000.5) 0 5.48 yr (2,003 days) 2.2301 AU 1.0109 AU 1.6205 AU 0.3762 2.06 yr (753 days) 12.072° 0.4778 ms / day 4.5717° 286.00° 8.7537° 0.0020 AU0.8 LD 0.22 0.04 km0.3 × 0.6 km0.311 km (calculated) 0.61069 0.00002 hlightcurve-plot0.61070 0.00003 h0.61073 h0.610752 0.000001 h 0.20 (assumed)0.39 0.09 S 19.45 0.2719.919.93 0.11 (436724) 2011 UW 158 is a stony, walnut-shaped asteroid and fast rotator, classified as a near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 300 meters in diameter. It was discovered on 25 October 2011, by Pan-STARRS at Haleakala Observatory on the island of Maui, Hawaii, in the United States. Orbital description 2011 UW 158 orbits the Sun at a distance of 1.0–2.2 AU once every 2 years and 1 month (753 days). Its orbit has an eccentricity of 0.38 and an inclination of 5° with respect to the ecliptic. Its observation arc begins with its official discovery observation by Pan-STARRS, as no precoveries were taken, and no prior identifications were made. Close approach The asteroid has an Earth minimum orbit intersection distance of 0.0020 AU km on off 2, which corresponds to 0.8 lunar distances (LD). On 19 July 2015, it passed about 2.5 million kilometers from Earth (6.5 LD), attracting the interest of astronomers. The asteroid was listed as level 1 in the Torino Scale on 4 November 2011, 9 days after its discovery, but was removed two weeks later. horizontal left 204 330 2011 UW158 July2015 flyby-orbits.png 2011 UW158 July2015 flyby-sky_trajectory.png Left: Inner solar system orbits; right: Motion of 2011 UW 158 across sky, 6 hour motion left Physical characteristics Spectral type 2011 UW 158 is an assumed stony S-type asteroid, the most common type among the populations of near-Earth and inner main-belt asteroids. Diameter and albedo Bruce Gary at Hereford Arizona Observatory (G95) estimated a mean diameter of 220 meters with a high albedo of 0.39, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroid of 0.20 and calculates a mean-diameter of 311 meters based on an absolute magnitude of 19.9. Fast rotator In July and August 2015, rotational lightcurves of this asteroid were obtained from photometric observations by Bruce Gary at Hereford Arizona Observatory and by Brian Warner at the CS3–Palmer Divide Station in California (U82). Lightcurve analysis gave a rotation period of 0.6107 hours (36.6 minutes) with a brightness variation between 0.52 and 2.05 magnitude (U=3/3/3).lightcurve-plot This makes 2011 UW 158 one of the top 200 fast rotators, suggesting it is a large boulder rather than a rubble pile. Shape Radar observations by the Arecibo Observatory on 14 July 2015, revealed that the asteroid's shape looks like an unshelled walnut with a diameter of 300 by 600 metres. The radiometric observations also agreed with the previously obtained photometric ones and gave a period of 37 minutes. Media attention It also attracted the media and even firms such as Planetary ResourcesMining Firm Aiming For Platinum-Loaded Asteroid http://news.sky.com/story/1521488/mining-firm-aiming-for-platinum-loaded-asteroid https://web.archive.org/web/20150721185839/http://news.sky.com/story/1521488/mining-firm-aiming-for-platinum-loaded-asteroid dead 21 July 2015 2015-07-23 for its alleged content of platinum worth as high as 5 trillion U.S. dollars.UW-158: Watch live as asteroid worth £ 3 TRILLION passes close to Earth https://www.mirror.co.uk/news/world-news/uw-158-watch-live-asteroid-worth-6097254 2015-07-23https://metro.co.uk/2015/07/19/what-you-can-expect-to-see-as-a-3-trillion-asteroid-passes-earth-tonight-5302804/ What you can expect to see as a £3 trillion asteroid passes Earth tonight 2015-07-23http://main.slooh.com/event/5-trillion-dollar-asteroid-makes-close-approach-to-earth/ $5 Trillion Dollar Asteroid Makes Close Approach to Earth 2015-07-23 Commenters at StackExchange have denied these estimations as being "orders of magnitude too high",https://space.stackexchange.com/q/10048 How is it known that asteroid 2011 UW 158 has so much platinum? 2015-07-23 and radar observations have shown that the object contains no more metal than an average rocky asteroid.http://iaaweb.org/iaa/Scientific%20Activity/draftprogpdc17.pdf 5th IAA Planetary Defense Conference 2017-06-03 19 August 2019 https://web.archive.org/web/20190819120554/http://iaaweb.org/iaa/Scientific%20Activity/draftprogpdc17.pdf deadhttps://twitter.com/astrotweeps/status/865105034459189248 Ground-based radar observations of human space flight accessible targets 2017-06-03 Notes lightcurve-plot Lightcurve plot of 2011 UW 158 by Brian Warner at the CS3–Palmer Divide Station in July 2015: rotation period of 0.61069 0.00002 hours with an amplitude of 0.65 magnitude References 30em 2017-04-19 last obs. JPL Small-Body Database Browser: 436724 (2011 UW158) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2436724 Jet Propulsion Laboratory 2 June 2017 436724 (2011 UW158) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=436724 28 March 2017 Solar System Studies at Arecibo Observatory http://www.naic.edu/~pradar/news.php#2015 Arecibo Observatory 2015-07-23 2011 UW158 Impact Risk Near Earth Object Program NASA http://neo.jpl.nasa.gov/risk/2011uw158.html dead https://web.archive.org/web/20111106205050/http://neo.jpl.nasa.gov/risk/2011uw158.html November 6, 2011 NEOs Removed from Impact Risks Tables Near Earth Object Program NASA http://neo.jpl.nasa.gov/risk/removed.html https://web.archive.org/web/20020602101400/http://neo.jpl.nasa.gov/risk/removed.html dead 2 June 2002 28 March 2017 First detailed images of rare asteroid to pass close by Earth on 19 July 19 July 2015 Astronomy Now https://astronomynow.com/2015/07/19/first-detailed-images-of-rare-asteroid-to-pass-close-by-earth-on-19-july/ 28 March 2017 436724 28 March 2017 Gary, Bruce L. January 2016 Unusual Properties for the NEA (436724) 2011 UW158 https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43...33G The Minor Planet Bulletin 43 1 33–38 1052-8091 2016MPBu...43...33G 28 March 2017 Warner, Brian D. January 2016 Near-Earth Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2015 June–September https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43...66W The Minor Planet Bulletin 43 1 66–79 32455369 7244002 1052-8091 2016MPBu...43...66W 28 March 2017 Albino Carbognani Bruce L. Gary Julian Oey Giorgio Baj Paolo Bacci January 2016 Pole and Shape for the NEA (436724) 2011 UW158 https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016MPBu...43...38C The Minor Planet Bulletin 43 1 38–41 1052-8091 2016MPBu...43...38C 28 March 2017 6 Peter Veres Robert Jedicke Alan Fitzsimmons Larry Denneau Mikael Granvik Bryce Bolin Serge Chastel Richard J. Wainscoat William S. Burgett Kenneth C. Chambers Heather Flewelling Nick Kaiser Eugen A. Magnier Jeff S. Morgan Paul A. Price John L. Tonry Christopher Waters November 2015 Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results https://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V Icarus 261 34–47 2015Icar..261...34V 10.1016/j.icarus.2015.08.007 1506.00762 53493339 28 March 2017 External links Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) Dictionary of Minor Planet Names, Google books Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend 436724 436724 2011UW158 436724 436724 (436724) 2011 UW 158 436724 436724 436724 20111025