2001 YB₅

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]

2001 YB₅

Designations
Minor planet category	Apollo NEO PHA
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 7
Aphelion	4.36299 AU (652.694 Gm)
Perihelion	0.316468 AU (47.3429 Gm)
Semi-major axis	2.339727 AU (350.0182 Gm)
Eccentricity	0.864742
Orbital period	3.58 yr (1307.2 d)
Mean anomaly	313.434°
Mean motion	0° 16^m 31.422^s / day
Inclination	5.54537°
Longitude of ascending node	108.444°
Argument of perihelion	115.206°
Earth MOID	0.00382892 AU (572,798 km)
Jupiter MOID	0.698703 AU (104.5245 Gm)
Physical characteristics
Rotation period	2.5 h (0.10 d)
Absolute magnitude (H)	20.9

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]

References

1. "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. Archived from the original on 18 November 2016. Retrieved 27 January 2016.
3. Huge Asteroid Narrowly Misses Earth
4. "Repeated Blows: Rough Neighbourhoods" (PDF). Luann Becker. Retrieved 27 January 2016.

External links

• 2001 YB5 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• 2001 YB5 at ESA–space situational awareness
  • Ephemerides · Observations · Orbit · Physical Properties · Summary
• 2001 YB5 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters