(357439) 2004 BL86

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(357439) 2004 BL86
Radar images of 2004 BL86 and its moon.gif
Goldstone radar image of (357439) 2004 BL86 and its satellite S/2015 (357439) 1
Discovery[1]
Discovered by LINEAR (704)
Discovery date 30 January 2004
Designations
MPC designation (357439) 2004 BL86
Apollo NEO,
PHA[2]
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0[2]
Observation arc 4084 days (11.18 yr)
Aphelion 2.1069 AU (315.19 Gm)
Perihelion 0.89754 AU (134.270 Gm)
1.50223 AU (224.730 Gm)
Eccentricity 0.40252
1.84 yr (672.52 d)
208.11194°
Inclination 23.77604°
126.70921°
311.44162°
Known satellites 1[3]
Earth MOID 0.00810452 AU (1,212,419 km)
Jupiter MOID 3.24294 AU (485.137 Gm)
Physical characteristics
Dimensions 325 m (1,066 ft)[3]
2.6205 h (0.10919 d)
V-type asteroid[4]
19.3[2]

(357439) 2004 BL86,[5] provisionally known as 2004 BL86, is a near-Earth asteroid estimated to be about 325 meters (1,066 feet) in diameter.[3] It was discovered on 30 January 2004 by LINEAR.[1] It passed 1,199,600 km (745,400 mi), or 3.1 lunar distances, from Earth on 26 January 2015 at 16:20 UTC.[5][6] During the 2015 approach it was determined to have a satellite.

2015 Earth approach

On 26–27 January 2015, the asteroid briefly peaked around apparent magnitude 9 and was near the celestial equator.[7] 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.[8] Near closest approach the asteroid was moving about 2.5 degrees per hour (2.5 arcseconds per second).[7][9] The asteroid came to opposition (furthest elongation in the sky from the Sun) on 27 January 2015 at 04:37 UTC.[7] Around 5:00 UTC, the asteroid was near M44 (the Beehive Cluster).[9]

26 January 2015 approach of 3.1 lunar distances was the closest approach of 2004 BL86 for at least the next 200 years.[5][6][10] 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.[11]

Satellite

A satellite was first detected by ground-based telescopes by Joe Pollock and Petr Pravec.[12] 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 (230 feet) across.[3] The secondary is estimated to orbit at least 500 metres (1,600 ft) from the primary.[13] About 16% of asteroids over 200 metres (660 ft) in diameter are thought to be binaries.[3]

Gallery

  • Asteroid2004BL86-20150119.png

    Asteroid 2004 BL86 safely passes Earth on 26 January 2015

  • Asteroid-2004BL86-EarthCloseApproach-20150126.png

    Trajectory of 2004 BL86 during Earth close approach

  • 2004BL86XiPup2.jpg

    2004 BL86 (star trail on left) near Xi Puppis

References

  1. ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found. (K04B86L)
  2. ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.0 5.1 5.2 Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ 7.0 7.1 7.2 Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ 9.0 9.1 Lua error in package.lua at line 80: module 'strict' not found.
  10. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  12. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  13. ↑ Lua error in package.lua at line 80: module 'strict' not found.

External links

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