Astronomy:(357439) 2004 BL86

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(357439) 2004 BL86
Radar images of 2004 BL86 and its moon.gif
Goldstone radar image of 2004 BL86 and its minor-planet moon
Discovery[1][2]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date30 January 2004
Designations
(357439) 2004 BL86
Minor planet categoryNEO · PHA · Apollo[1][3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc4,863 d (13.31 yr)
|{{{apsis}}}|helion}}2.1070 AU
|{{{apsis}}}|helion}}0.8974 AU
1.5022 AU
Eccentricity0.4026
Orbital period673 d (1.84 yr)
Mean anomaly169.27°
Mean motion0° 32m 7.08s / day
Inclination23.775°
Longitude of ascending node126.69°
311.45°
Known satellites1[4][5]
Earth MOID0.0092 AU (3.6 LD)
Physical characteristics
Mean diameter0.263±0.026 km[6]
0.290±0.030 km[7]
0.325±0.025 km[5][lower-alpha 1]
Rotation period2.620±0.001 h[6]
2.6205±0.0003 h[8]
2.637±0.024 h[7]
Geometric albedo0.40[7]
0.40±0.08[6]
V[7][9][10]
Absolute magnitude (H)19.05[9]
19.3[1][7]
19.51±0.02[6]


(357439) 2004 BL86 is a bright sub-kilometer asteroid and binary system, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 300 meters (980 ft) 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.[3] Its 70-meter (200 ft) moon was discovered during the asteroid's close approach to the Earth in January 2015.[4][5]

2015 Earth approach

On 26 January 2015 at 16:20 UTC, 2004 BL86 passed 1,199,600 km (745,400 mi), or 3.1 lunar distances, from Earth.[11] The asteroid briefly peaked around apparent magnitude 9 and was near the celestial equator.[12] The asteroid was visible in telescopes with objectives of 100 mm (4 in) or larger; high-end binoculars under a dark sky may also have worked.[13] Near closest approach the asteroid was moving about 2.5 degrees per hour (2.5 arcseconds per second).[12][14] The asteroid came to opposition (furthest elongation in the sky from the Sun) on 27 January 2015 at 04:37 UTC.[12] Around 5:00 UTC, the asteroid was near M44 (the Beehive Cluster).[14]

The 26 January 2015 approach of 3.1 lunar distances was the closest approach of 2004 BL86 for at least the next 200 years.[11][15] For comparison, 2015 TB145, about twice the size of 2004 BL86, passed 486,800 km (302,500 mi), or 1.3 lunar distances, from Earth on 31 October 2015.[16]

Satellite

A minor-planet moon, provisionally designated S/2015 (357439) 1, was first detected by ground-based telescopes by Joe Pollock and Petr Pravec.[8][17] Observations by the Goldstone Deep Space Communications Complex and Green Bank Telescope confirmed that it is a binary asteroid with a secondary roughly 70 meters (200 ft) across.[5] The secondary is estimated to orbit at least 500 meters (1,600 ft) from the primary.[4] About 16% of asteroids over 200 meters (660 ft) in diameter are thought to be binaries.[5]

Numbering and naming

This minor planet was numbered on 27 March 2013 (M.P.C. 83151).[18] As of 2020, it has not been named.[3]

Gallery

  • Animation of 2004 BL86's orbit
       Sun ·    Earth  ·   2004 BL86

  • 2004 BL86 safely passes Earth on 26 January 2015

  • Trajectory of 2004 BL86 during Earth close approach

  • 2004 BL86 (star trail on left) near Xi Puppis

Notes

  1. ↑ Radar Team 2015a: diameter primary 0.325±0.025 km. Diameter secondary 0.070 km. The satellites discovery is credited to Pollock et al.[8] Summary figures for (357439) 2004 BL86 at LCDB

References

  1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 357439 (2004 BL86)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2357439;cad=1. Retrieved 29 November 2017. 
  2. ↑ "MPEC 2004-B80 : 2004 BL86". IAU Minor Planet Center. 31 January 2004. https://www.minorplanetcenter.net/mpec/K04/K04B80.html. Retrieved 7 June 2014.  (K04B86L)
  3. ↑ 3.0 3.1 3.2 "357439 (2004 BL86)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=357439. Retrieved 30 September 2020. 
  4. ↑ 4.0 4.1 4.2 Johnston, Wm. Robert (31 January 2015). "Asteroids with Satellites Database – (357439) 2004 BL86". Johnston's Archive. http://www.johnstonsarchive.net/astro/astmoons/am-357439.html. Retrieved 29 November 2017. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 Agle, D. C. (26 January 2015). "Asteroid That Flew Past Earth Today Has Moon". NASA/Jet Propulsion Laboratory. https://www.jpl.nasa.gov/news/news.php?feature=4459. Retrieved 29 November 2017. 
  6. ↑ 6.0 6.1 6.2 6.3 Reddy, Vishnu et al. (September 2015). "The Physical Characterization of the Potentially Hazardous Asteroid 2004 BL86: A Fragment of a Differentiated Asteroid". The Astrophysical Journal 811 (1): 10. doi:10.1088/0004-637X/811/1/65. Bibcode: 2015ApJ...811...65R. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 Birlan, M. et al. (September 2015). "Characterization of (357439) 2004 BL86 on its close approach to Earth in 2015". Astronomy and Astrophysics 581: 7. doi:10.1051/0004-6361/201526460. Bibcode: 2015A&A...581A...3B. 
  8. ↑ 8.0 8.1 8.2 Pollock, J.; Pravec, P.; Oey, J.; Reichart, D. E.; Haislip, J. B.; LaCluyze, A. P. (January 2015). "(357439) 2004 BL_86". Central Bureau Electronic Telegrams 4063 (4063): 1. Bibcode: 2015CBET.4063....1P. 
  9. ↑ 9.0 9.1 "LCDB Data for (357439)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=357439%7C. Retrieved 29 November 2017. 
  10. ↑ Franco, Lorenzo (July 2015). "Low Resolution Visible Reflectance Spectrum for NEA (357439) 2004 BL86". The Minor Planet Bulletin 42 (3): 186–187. ISSN 1052-8091. Bibcode: 2015MPBu...42..186F. 
  11. ↑ 11.0 11.1 "JPL Close-Approach Data: 357439 (2004 BL86)". NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2004BL86;cad=1#cad. Retrieved 7 June 2014. 
  12. ↑ 12.0 12.1 12.2 "(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. Retrieved 7 June 2014. 
  13. ↑ Musgrave, Ian (23 January 2015). "Seeing the Close Flyby of NEO 2004 BL86 26 - 27 January, 2015". http://astroblogger.blogspot.com.au/2015/01/seeing-close-flyby-of-neo-2004-bl86-26.html. Retrieved 28 January 2015. 
  14. ↑ 14.0 14.1 MacRobert, Alan (22 January 2015). "Mountain-size Asteroid Glides Past Earth". Sky & Telescope. http://www.skyandtelescope.com/astronomy-news/observing-news/asteroid-2004-bl86-01222015/. Retrieved 23 January 2015. 
  15. ↑ Busch, Michael (7 February 2015). "Final post-flyby update...". Twitter.com. https://twitter.com/michael_w_busch/status/563980696180375553. Retrieved 7 February 2015. 
  16. ↑ "JPL Close-Approach Data: 2015 TB145". NASA/Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2015TB145;cad=1#cad. Retrieved 2 December 2015. 
  17. ↑ "Image Release: High-Def Radar Images of Near-Earth Asteroid". National Radio Astronomy Observatory. 30 January 2015. https://public.nrao.edu/news/pressreleases/gbt-asteroid. Retrieved 30 January 2015. 
  18. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 29 November 2017. 

External links



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