2012 BX₃₄ is a small Aten asteroid that made one of the closest recorded asteroid close approaches of Earth on 27 January 2012. It passed within 0.0004371 AU (65,390 km; 40,630 mi) of Earth during its closest approach at 15:25 GMT.^[6] 2012 BX₃₄ measures around 8 meters (26 ft) across; if it had impacted in 2012, it would have been too small to pass through Earth's atmosphere intact.^[7]

During its 2012 close approach to Earth, 2012 BX₃₄ had a brightest apparent magnitude of about 13.9,^[5] making it about as bright as the dwarf planet Pluto. By 25 February 2012, it had dimmed to magnitude 30.^[1] During its close approach of 0.0246 AU (3,680,000 km; 2,290,000 mi) on 28 January 2014,^[6] it will only reach a magnitude of about 23.^[8] 2012 BX₃₄ has been observed in more detail using radar astronomy.^[9]

• List of asteroid close approaches to Earth in 2012

• "Zippy little asteroid 2012 BX34 makes a quick visit". Astro Bob. 27 January 2012. Retrieved 11 July 2013.
• 2012 BX34 – Close Approach. (Ernesto Guido, Giovanni Sostero & Nick Howes). 27 January 2012. Retrieved 11 July 2013.
• "Asteroid makes near-miss fly-by". BBC. 27 January 2012. Retrieved 11 July 2013.
• "Bus-Size Asteroid Buzzes Earth in Close Flyby". Space.com. 27 January 2012. Retrieved 11 July 2013.
• 2012 BX34 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
• 2012 BX34 at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical properties · Summary
• 2012 BX34 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters