(308635) 2005 YU55

Potentially hazardous near-Earth asteroid yes #FFC2E0 (308635) 2005 YU 55 2005 YU55 Radar.gif Goldstone radar images of asteroid 2005 YU 55taken 9 November 2011. R. S. McMillanSteward ObservatoryKitt Peak (691) 28 December 2005 (308635) 2005 YU 55 Apollo NEO PHA 13 January 2016 (JD 2457400.5) 1.65562913 AU Gm on on (Q) 0.659003712 AU Gm on (q) 1.15731642 AU Gm on (a) 0.430576028 (e) 1.25 Jyr (454.75 d) 0.340553512° (i) 35.9073158° (Ω) 175.227687° (M) 273.628156° (ω) 0.000433476 AU km on(0.17 LD) 0.0017 AU(0.66 LD) 0.03884 AU(15.11 LD) none 360 40 m 19.31 0.02 h 0.042 0.008 C-type 21.9 0.791636668 ms / day (n) 18 h d on on 0.2 km 2,183 days (5.98 yr) 0 3.60813 AU Gm on 5.347 (308635) 2005 YU 55 is a potentially hazardous asteroid 360 40 meters in diameter, as measured after its Earth flyby. Previously it was estimated to be 310 metersThe Herschel Space Observatory catches a glimpse of the minor planet during its rendezvous with Earth (17 November 2011) or about 400 m (1,300 feet) in diameter. It was discovered on 28 December 2005 by Robert S. McMillan at Steward Observatory, Kitt Peak. On 8 November 2011 it passed 0.85 lunar distances (324,900 kilometers; 201,900 miles) from Earth. 8 November 2011 flyby thumb|left|alt=Animation of the trajectory of asteroid 2005 YU55 compared with the orbits of Earth and the Moon on 8–9 November 2011.|Trajectory of asteroid 2005 YU 55 compared with the orbits of Earth and the Moon on 8–9 November 2011. thumb|left|alt=Skymap showing apparent trajectory of 2005 YU55.|Apparent trajectory on 8–9 November 2011. In February 2010, 2005 YU 55 was rated 1 on the Torino Scale for a potential pass near Earth on 10 November 2103, that posed no unusual level of danger. On 19 April 2010, radar ranging by the Arecibo radio telescope reduced uncertainties about the orbit by 50%. This improvement eliminated any possibility of an impact with Earth within the next 100 years. It was removed from the Sentry Risk Table on 22 April 2010 and as such it now has a rating of 0 on the Torino Scale. It is now known that on 10 November 2103 2005 YU 55 will be roughly 2 AU from Earth. On 8 November 2011 at 23:28 UT the asteroid passed 0.85 LD km mi on on from Earth. On 9 November 2011 at 07:13 UT the asteroid passed 0.6231 LD km mi on from the Moon. During the close approach the asteroid reached about apparent magnitude 11, and would have been visible to experienced observers using high-end binoculars with an objective lens of 80+ mm if it were not for bright moonlight preventing a true dark sky. Since the gibbous moon did interfere with the viewing, observers trying to visually locate the asteroid required a telescope with an aperture of 6 inches (15 centimeters) or larger. The next few times a known asteroid this large will come this close to Earth will be in 2028 when (153814) 2001 WN 5 passes 0.65 LD from Earth, and in 2029 when the 325-meter 99942 Apophis comes even closer at just 0.10 LD.NEO Earth Close-Approaches (Between 1900 A.D. and 2200 A.D., NEOs with H <=22, nominal distance within 5 LD) Near-Earth Object Program Office NASA/JPL http://neo.jpl.nasa.gov/cgi-bin/neo_ca?type=NEO&hmax=22&sort=dist&sdir=ASC&tlim=all&dmax=5LD&max_rows=20&action=Display+Table&show=1 https://archive.today/20121213115119/http://neo.jpl.nasa.gov/cgi-bin/neo_ca?type=NEO&hmax=22&sort=dist&sdir=ASC&tlim=all&dmax=5LD&max_rows=20&action=Display+Table&show=1 dead 13 December 2012 17 May 2015 According to Jay Melosh, if an asteroid the size of 2005 YU 55 (~400 m across) were to hit land, it would create a crater 6.3 km mi on across, 518 m ft on deep and generate a seven-magnitude-equivalent-earthquake. The chances of an actual collision with an asteroid like 2005 YU 55 is about 1 percent in the next thousand years. left Study thumb|right|300px|Swift captures flyby of asteroid 2005 YU 55. During the 2011 passage 2005 YU 55 was studied with radar using Goldstone, Arecibo, the Very Long Baseline Array, and the Green Bank Telescope. The Herschel Space Observatory has made far-infrared measurements of 2005 YU 55 on 10 November, helping determine its temperature and composition. Radar analysis has also helped to pin down the asteroid's albedo, or diffuse reflectivity. Although radar measurements do not detect visible light they can determine the distance and size of an object with a high degree of accuracy. This information, coupled with visible light measurements, provides a more accurate measure of an object's absolute magnitude, and therefore its albedo. On 8 November 2011, NASA released a statement mentioning a number of structures on the surface of the asteroid, which were detected as it passed near Earth.http://www.nasa.gov/mission_pages/asteroids/news/yu55-20111108.html NASA releases radar movie of Asteroid 2005 YU55 NASA November 8, 2011 6 December 2011 dmy-all 9 November 2011 https://web.archive.org/web/20111109220832/http://www.nasa.gov/mission_pages/asteroids/news/yu55-20111108.html dead On 11 November 2011, higher-resolution images showed concavities, a ridge near the asteroid's equator, and numerous features interpreted as decameter-scale boulders. Shape modeling based on the radar images shows that YU55's shape is close to spheroidal, with maximum dimensions of 360±40 m, and an equator-aligned ridge. A 150–200 meter-long, ~20 meter-high rise forms a portion of the ridge-line, and the number of boulders on the surface is comparable to that seen on the asteroid 25143 Itokawa by the Hayabusa spacecraft. Optical lightcurve measurements during the flyby provided a more accurate estimate of the asteroid's spin period about 19.3 hours. Because 2005 YU 55 is so nearly spheroidal, it was not significantly torqued by Earth's tides during the flyby, and there is no evidence of non-principal-axis rotation. Optical, near-infrared, and ultraviolethttp://www.cbat.eps.harvard.edu/cbet/002900/CBET002937.txt Electronic Telegram 2937 2005 YU_55 Bodewits Dennis etal 5 December 2011 Central Bureau for Astronomical Telegrams 14 November 2018 spectroscopy confirmed that 2005 YU 55 is a C-type asteroid. Future trajectory On 19 January 2029, 2005 YU 55 will pass 0.0023 AU km mi on from Venus. The close approach distance to Venus in 2029 will determine how close the asteroid will pass to Earth in 2041. Before the November 2011 observations, the uncertainties in the post-2029 trajectory showed that the asteroid would pass somewhere between 0.002 AU km mi on off and 0.3 AU km mi on off of Earth in 2041. Radar astrometry in November 2011 clarified the Earth passage in 2041 and beyond. As a result of the November 2011 radar observations, it is now known that 2005 YU 55 will pass between 0.1017 AU km mi on off and 0.1020 AU of Earth on 12 November 2041. Using the current uncertainty region integrated until the future, the 2075 approach will be between 0.0013 AU km mi on off and 0.0021 AU km mi on off. References 25em MPEC 2005 Y47 : 2005 YU55 IAU Minor Planet Center 2005-12-29 https://minorplanetcenter.net/mpec/K05/K05Y47.html 2011-05-05 dmy-all Minor Planet Center – 2005 YU55 Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=2005+YU55 2014-11-19 dmy-all last observation: 2011-12-16; arc: 5.98 years JPL Small-Body Database Browser: 308635 (2005 YU55) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005YU55 7 April 2016 March 10, 2011 Asteroid 2005 YU55 to approach Earth on November 8, 2011 NASA/JPL Near-Earth Object Program Office Don Yeomans Lance Benner Jon Giorgini amp http://neo.jpl.nasa.gov/news/news171.html 2011-05-05 dmy-all https://web.archive.org/web/20110424015323/http://neo.jpl.nasa.gov/news/news171.html 24 April 2011 dead April 30, 2010 Arecibo telescope tracks 'potentially dangerous' asteroid within 1.5 million miles of Earth Cornell Chronicle @ Cornell University Blaine Friedlander, Jr. https://www.news.cornell.edu/stories/April10/AreciboAsteroid.html 2011-05-05 dmy-all https://web.archive.org/web/20110523103203/http://www.news.cornell.edu/stories/April10/AreciboAsteroid.html 23 May 2011 live 2011-10-29 2005 YU55 Goldstone Radar Observations Planning NASA/JPL Asteroid Radar Research Dr. Lance A. M. Benner http://echo.jpl.nasa.gov/asteroids/2005YU55/2005YU55_planning.html 2011-10-30 dmy-all October 26, 2011 NASA in Final Preparations for Nov. 8 Asteroid Flyby NASA/JPL http://www.jpl.nasa.gov/news/news.cfm?release=2011-332 2011-10-26 dmy-all 2012-01-13 https://web.archive.org/web/20120113035736/http://www.jpl.nasa.gov/news/news.cfm?release=2011-332 dead Date/Time Removed NASA/JPL Near-Earth Object Program Office http://neo.jpl.nasa.gov/risk/removed.html 2011-05-06 dmy-all https://web.archive.org/web/20110426000059/http://neo.jpl.nasa.gov/risk/removed.html 26 April 2011 dead 2005 YU55 Ephemerides for 9 Nov 2011 Near Earth Objects – Dynamics (NEODyS) https://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=2005YU55&oc=500&y0=2011&m0=11&d0=8&h0=0&mi0=0&y1=2011&m1=11&d1=12&h1=0&mi1=0&ti=1.0&tiu=hours 2011-05-05 dmy-all Last observation: 2011-01-04; arc: 14.9 years JPL close-approach data: 153814 (2001 WN5) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001WN5;cad=1#cad 2011-10-16 dmy-all last observation: 2011-12-16; arc: 5.98 years JPL close-approach data: (2005 YU55) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005YU55;cad=1#cad 2013-09-07 dmy-all 6 November 2011 Herschel to observe near-Earth asteroid UK outreach site for the Herschel Space Observatory Chris North http://herschel.cf.ac.uk/news/herschel-observe-near-earth-asteroid 2011-11-07 dmy-all 2011-11-09 https://web.archive.org/web/20111109071155/http://herschel.cf.ac.uk/news/herschel-observe-near-earth-asteroid dead October 31, 2011 Large asteroid to pass by Earth Nov. 8, but what if it didn't? Purdue University Elizabeth K. Gardner http://www.purdue.edu/newsroom/research/2011/111031T-MeloshAsteroid.html 2011-11-07 dmy-all 2011-11-11 NASA releases updated radar movie of asteroid 2005 YU55 (2011–351) NASA/JPL http://www.nasa.gov/mission_pages/asteroids/news/yu55-20111111_prt.htm 2011-12-06 dmy-all March 31, 2012 Shape and spin of near-Earth asteroid 308635 (2005 YU55) from radar images and speckle tracking LPI M.W. Busch https://www.lpi.usra.edu/meetings/acm2012/pdf/6179.pdf 9 April 2012 dmy-all etal March 31, 2012 The near-Earth encounter of 2005 YU55: Time-resolved visible and near-infrared spectroscopy LPI N.A. Moskovitz https://www.lpi.usra.edu/meetings/acm2012/pdf/6382.pdf 9 April 2012 dmy-all March 31, 2012 CCD photometric observations of 2005 YU55 during the 2011 November flyby LPI B.D. Warner https://www.lpi.usra.edu/meetings/acm2012/pdf/6013.pdf 9 April 2012 dmy-all etal 2010-03-25 Earth impact risk summary: 2005 YU55 NASA/JPL Near-Earth Object program office Wayback Machine http://neo.jpl.nasa.gov/risk/2005yu55.html https://web.archive.org/web/20100325062602/http://neo.jpl.nasa.gov/risk/2005yu55.html 2010-03-25 2013-10-23 dmy-all dead http://neo.jpl.nasa.gov/cgi-bin/ip?6.1e-04 6.1e-04 = 1 in 1,640 chance jpl.nasa.gov 2013-10-23 2013-10-24 https://archive.today/20131024023156/http://neo.jpl.nasa.gov/cgi-bin/ip?6.1e-04 dead (308635) 2005YU55 Ephemerides for 10 November 2103 NEODyS (Near Earth Objects Dynamic Site) https://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=308635&oc=500&y0=2103&m0=11&d0=09&h0=0&mi0=0&y1=2103&m1=11&d1=11&h1=0&mi1=0&ti=1.0&tiu=days 2013-10-23 dmy-all External links http://www.keckobservatory.org/news_preview/live_webcast_keck_telescope_to_watch_asteroid_flyby/ dead 2012-04-02 dmy-all https://web.archive.org/web/20120402211723/http://www.keckobservatory.org/news_preview/live_webcast_keck_telescope_to_watch_asteroid_flyby/ Live webcast: Keck telescope to watch asteroid flyby Ustream video http://www.minorplanet.info/ObsGuides/YU55/ 2005 YU55 observing campaign 2011-10-28 2011-11-01 https://web.archive.org/web/20111101002734/http://www.minorplanet.info/ObsGuides/YU55/ dead http://www.nasa.gov/images/content/541440main_2005_YU55_approach.gif Orbital simulation of 2005 YU55 animated GIF image nasa.gov 2011-07-27 2013-01-07 https://web.archive.org/web/20130107101230/http://www.nasa.gov/images/content/541440main_2005_YU55_approach.gif dead https://www.ustream.tv/recorded/18250783 NASA asteroid Q&A (on YU55) 1 November 2011 https://planetary.org/blog/article/00002463/ Arecibo saves us from another potentially hazardous asteroid Emily Lakdawalla 29 April 2010 3 November 2011 4 November 2011 https://web.archive.org/web/20111104172332/http://planetary.org/blog/article/00002463 dead http://blogs.discovermagazine.com/badastronomy/2011/05/09/no-2005-yu55-wont-destroy-the-earth/ No, 2005 YU55 won't destroy the Earth Phil Plait 9 May 2011 3 November 2011 30 October 2011 https://web.archive.org/web/20111030230335/http://blogs.discovermagazine.com/badastronomy/2011/05/09/no-2005-yu55-wont-destroy-the-earth/ dead https://www.usatoday.com/tech/science/space/story/2011-11-01/asteroid-viewing-tuesday/51035012/1 Asteroid 2005 YU55 will zip by Earth next week http://astroguyz.com/2011/11/05/the-passage-of-asteroid-2005-yu55-how-to-see-it The passage of asteroid 2005 YU55 & how to see it David Dickinson 5 November 2011 7 November 2011 9 November 2011 https://web.archive.org/web/20111109215759/http://astroguyz.com/2011/11/05/the-passage-of-asteroid-2005-yu55-how-to-see-it/ dead http://www.global-rent-a-scope.com/aartscope/2011/11/7/2005-yu55-passes-inside-1-lunar-distance-nov-8th-2011.html https://web.archive.org/web/20111110183855/http://www.global-rent-a-scope.com/aartscope/2011/11/7/2005-yu55-passes-inside-1-lunar-distance-nov-8th-2011.html dead 10 November 2011 Photos of flyby and Observation guide Peter Lake 8 November 2011 http://www.nasa.gov/multimedia/videogallery/index.html?collection_id=77341&media_id=120141271 Rotation simulation Video gallery Nasa.Gov 308635 308635 2005YU55 308635 2002 MN Large NEO Earth close approach(inside the orbit of the Moon) 8 November 2011, and8 November 2075 2011 XC 2 308635 (308635) 2005 YU 55 308635 308635 308635 308635 308635 308635 20111108 20051228