astro.wikisort.org - Asteroid

2006 QQ₂₃[lower-alpha 1] is a sub-kilometre asteroid, classified as a near-Earth object of the Aten group that is potentially hazardous only as the orbit evolves over millennia. It was first observed on 21 August 2006 by the Siding Spring Survey.[1][2] On 10 August 2019, the object safely passed 7.4 million kilometres (4.6 million miles) from Earth.[5][6] With a 12 year observation arc it has a well determined orbit and is not a threat for the foreseeable future.[5]

2006 QQ₂₃

Discovery[1]
Discovered by	SSS
Discovery site	Siding Spring Obs.
Discovery date	21 August 2006 (first observed)
Designations
MPC designation	2006 QQ23
Minor planet category	Aten · NEO · PHA[1][2]
Orbital characteristics[2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0[2] · 1[1]
Observation arc	12.95 yr (4,730 d)
Aphelion	1.0321 au
Perihelion	0.5748 au
Semi-major axis	0.8035 au
Eccentricity	0.2846
Orbital period (sidereal)	263 d
Mean anomaly	47.558°
Mean motion	1° 22m 6.6s / day
Inclination	3.4316°
Longitude of ascending node	4.8313°
Argument of perihelion	124.78°
Earth MOID	0.0338 au (13.2 LD)
Mercury MOID	0.2325 au[1]
Venus MOID	0.0501 au[1]
Mars MOID	0.3592 au[1]
Physical characteristics
Mean diameter	250 m (est. at 0.26)[3][4] 570 m (est. at 0.05)[3][4]
Absolute magnitude (H)	20.1[1][2]

Discovery

2006 QQ₂₃ was first observed on 21 August 2006[7] by the Siding Spring Survey, at the Siding Spring Observatory in Australia.[1][2]

Orbit and classification

2006 QQ₂₃ is classified as an Aten asteroid, which means that it is a near-Earth asteroid that crosses Earth's orbit at two points and has an orbital period of less than a year. Because it will come within 0.05 au of the Earth (MOID) and has an absolute magnitude (H) brighter than 22,[8] 2006 QQ₂₃ is labelled as a potentially hazardous object.[1][2] With a 12 year observation arc it has a well determined orbit and is not a threat for the foreseeable future.[5]

It orbits the Sun at a distance of 0.57–1.03 au in less than 9 months (263 days; semi-major axis of 0.80 au). Its orbit has an eccentricity of 0.28 and an inclination of 3.4° with respect to the ecliptic.[2] The body's observation arc begins with its first observation at the Siding Spring Observatory on 21 August 2006.[1]

Close approach in 2019

On 10 August 2019 at 7:23 am UTC,[6] 2006 QQ₂₃ safely passed 0.04977 au (7,445,000 km) from Earth;[7][9] travelling at around 4.67 km/s (16,800 km/h)[7][10] The asteroid was recovered on 14 July 2019, which extended the observation arc from 8 years to 12 years, and therefore it had a very small uncertainty in the 2019 approach.[1] The uncertainty region in the close approach was ±60 km.[5][lower-alpha 2]

Physical characteristics

Based on its absolute magnitude of 20.1,[1] 2006 QQ₂₃ is estimated to have a diameter of 250–570 metres using an assumed albedo between 0.05 (carbonaceous) and 0.26 (siliceous).[3][4]

Notes

References

External links

• MPEC 2009-P41 : 2006 QQ23, Minor Planet Electronic Circular
• List Of Aten Minor Planets (by designation), Minor Planet Center
• List of the Potentially Hazardous Asteroids (PHAs), Minor Planet Center
• PHA Close Approaches To The Earth, Minor Planet Center
• 2006 QQ23 at NeoDyS-2, Near Earth Objects—Dynamic Site
  • Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
• 2006 QQ23 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

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