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(620094) 2016 AJ193

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(620094) 2016 AJ193
Doppler-delay radar images of 2016 AJ193 from the Goldstone Radar on 22 August 2021
Discovery
Discovered byWISE
Discovery siteLow Earth orbit
Discovery date17 May 2010
(first observation only)
Designations
MPC designation2016 AJ193
Alternative designations2010 KV134
Minor planet categoryNEO · Apollo · PHA
Orbital characteristics
Epoch 1 July 2020 (JD 2459396.5)
Uncertainty parameter 0
Observation arc11.51 yr (4,204 days)
Earliest precovery date16 February 2010
Aphelion5.931 AU
Perihelion0.5999 AU
Semi-major axis3.265 AU
Eccentricity0.8163
Orbital period (sidereal)5.90 yr (2,155 days)
Mean anomaly344.173°
Mean motion0° 10 1.359 / day
Inclination22.570°
Longitude of ascending node331.285°
Argument of perihelion81.996°
Earth MOID0.01553 AU (2,323,000 km)
Physical characteristics
Mean diameter1.374±0.403 km
Synodic rotation period3.508±0.001 h
Geometric albedo0.031±0.031
Absolute magnitude (H)18.99

(620094) 2016 AJ193 (provisional designation 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. With an observation arc over 11 years, 2016 AJ193 has a well-determined orbit and trajectory through the year 2086. The asteroid's orbit is only potentially hazardous on a time scale of thousands of years.

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). It is the largest asteroid that approached within 10 LD (3.8 million km; 2.4 million mi) of Earth in 2021.

The asteroid received the permanent minor planet number 620094 by the Minor Planet Center on 7 April 2023.

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

References

  1. ^ "2016 AJ193". Minor Planet Center. International Astronomical Union. Retrieved 3 September 2021.
  2. ^ "MPEC 2020-B104 : 2016 AJ193". Minor Planet Electronic Circular. Minor Planet Center. 23 January 2020. Retrieved 3 September 2021.
  3. ^ "JPL Small-Body Database Browser: (2016 AJ193)" (2021-08-21 last obs.). Jet Propulsion Laboratory. Retrieved 3 September 2021.
  4. ^ Benner, Lance A. M. "Goldstone Radar Observations Planning: 2016 AJ193 and 2011 UC292". Jet Propulsion Laboratory. California Institute of Technology. Retrieved 3 September 2021.
  5. "MPEC 2016-B28 : 2016 AJ193". Minor Planet Electronic Circular. Minor Planet Center. 18 January 2016. Retrieved 3 September 2021.
  6. ^ Irizarry, Ezzie (20 August 2021). "Heads Up! Close Asteroid Pass August 21". EarthSky. 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. Retrieved 3 September 2021.
  8. "NEO Earth Close Approaches". Center for Near Earth Object Studies. Jet Propulsion Laboratory. Retrieved 3 March 2021.
  9. "M.P.C. 163231" (PDF). Minor Planet Circular (163231). Minor Planet Center: 1211. 7 April 2023. Retrieved 21 April 2023.

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