2001 YB5

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2001 YB5
Apollo, NEO, PHA
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 7
Aphelion4.36299 AU (652.694 Gm)
Perihelion0.316468 AU (47.3429 Gm)
2.339727 AU (350.0182 Gm)
3.58 yr (1307.2 d)
0° 16m 31.422s /day
Earth MOID0.00382892 AU (572,798 km)
Jupiter MOID0.698703 AU (104.5245 Gm)
Physical characteristics
2.5 h (0.10 d)

2001 YB5 is a sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group that passed at a nominal distance of 0.0043767 AU (654,750 km; 406,840 mi) from the Moon and 0.0055633 AU (832,260 km; 517,140 mi) from Earth on 7 January 2002.[1]

The asteroid measures approximately 300 meters in diameter; insignificant enough in size to be only discovered later that year in 26 December 2002 by NASA's Near-Earth Asteroid Tracking program (NEAT).[2][3][4] The nearest proximity it has reached Earth by was 830,000 kilometres which is approximately twice the distance to the Moon.[4] Based on limited observations, the asteroid may have a 2.5 hour rotation period and a Minimum Orbit Intersection Distance (MOID) from the Earth of 0.0038 AU (570,000 km; 350,000 mi).[1] The findings of David Morrison of the NASA Ames Research Center claim that although YB5-sized objects in space commonly fly and orbit the Earth's proximity at such close distances annually, there are no indications of a YB5 collision on Earth as their predicted impact spans from about once every 20,000 to 30,000 years.[4]


  1. ^ a b c "JPL Small-Body Database Browser: (2001 YB5)". Jet Propulsion Laboratory. Retrieved 30 March 2016.
  2. ^ "Large Asteroid Passes Close to Earth". neat.jpl.nasa.gov. Retrieved 27 January 2016.
  3. ^ Huge Asteroid Narrowly Misses Earth
  4. ^ a b c "Repeated Blows: Rough Neighbourhoods" (PDF). Luann Becker. Retrieved 27 January 2016.

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