(357439) 2004 BL86

Near-Earth asteroid discovered in 2004 November 2018 yes 357439 2004 BL 86 #FFC2E0 Radar images of 2004 BL86 and its moon.gif Goldstone radar image of 2004 BL 86 and its minor-planet moon LINEAR Lincoln Lab's ETS 30 January 2004 (357439) 2004 BL 86 NEOPHAApollo 4 September 2017 (JD 2458000.5) 0 4863 days years on 2.1070 AU 0.8974 AU 1.5022 AU 0.4026 673 days years on 169.27° 0.5353 ms / day 23.775° 126.69° 311.45° 0.0092 AU (3.6 LD) 1 0.263 0.026 km0.290 0.030 km0.325 0.025 kmlcdb-Radar-Team-2015a 2.620 0.001 hour2.6205 0.0003 hour2.637 0.024 hour 0.400.40 0.08 V 19.0519.319.51 0.02 357439 2004 BL 86 is a bright sub-kilometer asteroid and binary system, classified as a near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 300 m ft us in diameter. It was discovered on 30 January 2004 by astronomers of the Lincoln Near-Earth Asteroid Research at Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico. Its 70 m ft -2 on us moon was discovered during the asteroid's close approach to the Earth in January 2015. 2015 Earth approach On 26 January 2015 at 16:20 UTC, 2004 BL 86 passed 1199600 km mi -2 on, or 3.1 lunar distances, from Earth. The asteroid briefly peaked around apparent magnitude 9 and was near the celestial equator. The asteroid was visible in telescopes with objectives of 100 mm in 0 on or larger; high-end binoculars under a dark sky may also have worked. Near closest approach the asteroid was moving about 2.5 degrees per hour (2.5 arcseconds per second). The asteroid came to opposition (furthest elongation in the sky from the Sun) on 27 January 2015 at 04:37 UTC. Around 5:00 UTC, the asteroid was near M44 (the Beehive Cluster). The 26 January 2015 approach of 3.1 lunar distances was the closest approach of 2004 BL 86 for at least the next 200 years. For comparison, 2015 TB 145, about twice the size of 2004 BL 86, passed 486800 km mi on, or 1.3 lunar distances, from Earth on 31 October 2015. Satellite A minor-planet moon orbiting (357439) 2004 BL 86 was first detected by ground-based telescopes by Joe Pollock and Petr Pravec. Observations by the Goldstone Deep Space Communications Complex and Green Bank Telescope confirmed that it is a binary asteroid with a secondary roughly 70 m ft -2 us across. The secondary is estimated to orbit at least 500 m ft us from the primary. About 16% of asteroids over 200 m ft us in diameter are thought to be binaries. Numbering and naming This minor planet was numbered on 27 March 2013 (M.P.C. 83151). As of 2020, it has not been named. Gallery left Notes lcdb-Radar-Team-2015a Radar Team 2015a: diameter primary 0.325 0.025 km. Diameter secondary 0.070 km. The satellites discovery is credited to Pollock et al. Summary figures for 357439 2004 BL 86 at LCDB References 30em 2017-05-24 last obs. JPL Small-Body Database Browser: 357439 (2004 BL86) https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2357439;cad=1 Jet Propulsion Laboratory 29 November 2017 357439 (2004 BL86) Minor Planet Center https://www.minorplanetcenter.net/db_search/show_object?object_id=357439 30 September 2020 MPC/MPO/MPS Archive Minor Planet Center https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html 29 November 2017 MPEC 2004-B80 : 2004 BL86 IAU Minor Planet Center 31 January 2004 https://www.minorplanetcenter.net/mpec/K04/K04B80.html 7 June 2014 (K04B86L) Asteroids with Satellites Database – (357439) 2004 BL86 Johnston's Archive 31 January 2015 Johnston Wm. Robert http://www.johnstonsarchive.net/astro/astmoons/am-357439.html 29 November 2017 last observation: 12 March 2013; arc: 9.11 years JPL Close-Approach Data: 357439 (2004 BL86) NASA/Jet Propulsion Laboratory https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004BL86;cad=1#cad 7 June 2014 https://twitter.com/michael_w_busch/status/563980696180375553 Final post-flyby update... Twitter.com Michael Busch 7 February 2015 7 February 2015 (357439) 2004BL86 Ephemerides for 25 January 2015 through 29 January 2015 NEODyS http://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=357439&oc=500&y0=2015&m0=1&d0=25&h0=0&mi0=0&y1=2015&m1=1&d1=29&h1=0&mi1=0&ti=1&tiu=hours 7 June 2014 Mountain-size Asteroid Glides Past Earth MacRobert Alan 22 January 2015 Sky & Telescope http://www.skyandtelescope.com/astronomy-news/observing-news/asteroid-2004-bl86-01222015/ 23 January 2015 Seeing the Close Flyby of NEO 2004 BL86 26 - 27 January, 2015 Musgrave Ian 23 January 2015 http://astroblogger.blogspot.com.au/2015/01/seeing-close-flyby-of-neo-2004-bl86-26.html 28 January 2015 last observation: 1 November 2015; arc: 22 days JPL Close-Approach Data: 2015 TB145 NASA/Jet Propulsion Laboratory https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015TB145;cad=1#cad 2 December 2015 Asteroid That Flew Past Earth Today Has Moon Agle D. C. 26 January 2015 NASA/Jet Propulsion Laboratory https://www.jpl.nasa.gov/news/news.php?feature=4459 29 November 2017 Image Release: High-Def Radar Images of Near-Earth Asteroid 30 January 2015 National Radio Astronomy Observatory https://public.nrao.edu/news/pressreleases/gbt-asteroid 30 January 2015 357439 29 November 2017 1 Vishnu Reddy Bruce L. Gary Juan A. Sanchez Driss Takir Cristina A. Thomas Paul S. Hardersen Yenal Ogmen Paul Benni Thomas G. Kaye Joao Gregorio Joe Garlitz David Polishook Lucille Le Corre Andreas Nathues September 2015 The Physical Characterization of the Potentially Hazardous Asteroid 2004 BL86: A Fragment of a Differentiated Asteroid The Astrophysical Journal 811 1 10 2015ApJ...811...65R 10.1088/0004-637X/811/1/65 1509.07122 119260041 1 M. Birlan M. Popescu D. A. Nedelcu V. Turcu A. Pop B. Dumitru F. Stevance O. Vaduvescu D. Moldovan P. Rocher A. Sonka L. Mircea September 2015 Characterization of (357439) 2004 BL86 on its close approach to Earth in 2015 Astronomy and Astrophysics 581 7 2015A&A...581A...3B 10.1051/0004-6361/201526460 free J. Pollock P. Pravec J. Oey D. E. Reichart J. B. Haislip A. P. LaCluyze January 2015 (357439) 2004 BL_86 Central Bureau Electronic Telegrams 4063 1 2015CBET.4063....1P Franco Lorenzo July 2015 Low Resolution Visible Reflectance Spectrum for NEA (357439) 2004 BL86 The Minor Planet Bulletin 42 3 186–187 1052-8091 2015MPBu...42..186F External links Asteroids with Satellites, Robert Johnston, johnstonsarchive.net PSI Scientists Study Surface Composition of Asteroid 2004 BL86 During Close Flyby of Earth, Planetary Science Institute, 27 January 2015 Asteroid Lightcurve Database (LCDB), query form (info https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html 16 December 2017 ) 357439 357439 2004BL86 357439 357439 2004 BL 86 357439 357439 357439 357439 357439 357439 20150126 20040130