Astronomy:2016 AJ193

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2016 AJ193
2016AJ193 Goldstone radar Aug22.gif
Doppler-delay radar images of 2016 AJ193 from the Goldstone Radar on 22 August 2021
Discovery[1][2]
Discovered byWISE
Discovery siteLow Earth orbit
Discovery date17 May 2010
(first observation only)
Designations
2016 AJ193
2010 KV134
Minor planet categoryNEO · Apollo · PHA[3]
Orbital characteristics[3]
Epoch 1 July 2020 (JD 2459396.5)
Uncertainty parameter 0
Observation arc11.51 yr (4,204 days)
Earliest precovery date16 February 2010
|{{{apsis}}}|helion}}5.931 AU
|{{{apsis}}}|helion}}0.5999 AU
3.265 AU
Eccentricity0.8163
Orbital period5.90 yr (2,155 days)
Mean anomaly344.173°
Mean motion0° 10m 1.359s / day
Inclination22.570°
Longitude of ascending node331.285°
81.996°
Earth MOID0.01553 AU (2,323,000 km)
Physical characteristics
Mean diameter1.374±0.403 km[3]
Rotation period3.508±0.001 h[4]
Geometric albedo0.031±0.031[3]
Absolute magnitude (H)18.99[3][1]


2016 AJ193, also known as 2010 KV134, is a near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 1.4 kilometres (0.87 mi) in diameter. It was discovered on 17 May 2010 by the Wide-field Infrared Survey Explorer (WISE) satellite, but was lost until it was reobserved on 16 January 2016.[5][2] With an observation arc over 11 years, 2016 AJ193 has a well-determined orbit and trajectory through the year 2086.[3] The asteroid's orbit is only potentially hazardous on a time scale of thousands of years.[6][7]

On 21 August 2021, the asteroid safely made a close approach to Earth from a distance of 0.0229 AU (3.43 million km; 2.13 million mi), or 8.92 lunar distances (LD). During closest approach, 2016 AJ193 reached a peak apparent magnitude of 14, visible to ground-based observers with telescope apertures of at least 20 cm (8 in).[4][6] It is the largest asteroid that approached within 10 LD (3.8 million km; 2.4 million mi) of Earth in 2021.[8]

2016 AJ193's rotation shown in radar images taken by Goldstone on 22 August 2021

References

  1. ↑ 1.0 1.1 "2016 AJ193". Minor Planet Center. International Astronomical Union. http://www.minorplanetcenter.net/db_search/show_object?object_id=2016+AJ193. Retrieved 3 September 2021. 
  2. ↑ 2.0 2.1 "MPEC 2020-B104 : 2016 AJ193". Minor Planet Electronic Circular. Minor Planet Center. 23 January 2020. https://www.minorplanetcenter.net/mpec/K20/K20BA4.html. Retrieved 3 September 2021. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "JPL Small-Body Database Browser: (2016 AJ193)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3740498;cad=1. Retrieved 3 September 2021. 
  4. ↑ 4.0 4.1 Benner, Lance A. M.. "Goldstone Radar Observations Planning: 2016 AJ193 and 2011 UC292". Jet Propulsion Laboratory. California Institute of Technology. https://echo.jpl.nasa.gov/asteroids/2016AJ193/2016AJ193.2021.goldstone.planning.html. Retrieved 3 September 2021. 
  5. ↑ "MPEC 2016-B28 : 2016 AJ193". Minor Planet Electronic Circular. Minor Planet Center. 18 January 2016. https://minorplanetcenter.net/mpec/K16/K16B28.html. Retrieved 3 September 2021. 
  6. ↑ 6.0 6.1 Irizarry, Ezzie (20 August 2021). "Heads Up! Close Asteroid Pass August 21". EarthSky. https://earthsky.org/space/close-asteroid-pass-august-21-asteroid-2016-aj193/. Retrieved 3 September 2021. 
  7. ↑ O'Neill, Ian J.; Fox, Karen; Handal, Joshua (3 September 2021). "Planetary Radar Observes 1,000th Near-Earth Asteroid Since 1968". Jet Propulsion Laboratory. NASA. https://www.jpl.nasa.gov/news/planetary-radar-observes-1000th-near-earth-asteroid-since-1968. Retrieved 3 September 2021. 
  8. ↑ "NEO Earth Close Approaches". Center for Near Earth Object Studies. Jet Propulsion Laboratory. https://cneos.jpl.nasa.gov/ca/. Retrieved 3 March 2021. 

External links




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