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2011 GA is a near-Earth object and Apollo asteroid that passed close to the Earth on 15 October 2023. Due to its size and low MOID, it is classified as a potentially hazardous asteroid (PHA).

Observations

2011 GA was discovered on 1 April 2011 by Andrea Boattinti, who was working for the Mount Lemmon Survey. [4]

In the days just after the close approach, the asteroid was observed by the Goldstone Solar-System Radar.[5]

Orbit and physical characteristics

The orbit and size of 2011 GA makes it a potentially hazardous asteroid (PHA). 2011 GA passed within 0.01743 AU (2,607,000 km; 1,620,000 mi) of the Earth on 15 October 2023.[6] The asteroid also passed within 0.02494 AU (3,731,000 km; 2,318,000 mi) from Earth around 15 October 1977. For comparison, the distance to the Moon is about 0.0026 AU (384,400 km).

2011 GA has a rotation period of about 4.4 hours.[5] Radar images of the asteroid showed a smooth, regular shape.

The Jupiter Tisserand invariant, used to distinguish different kinds of orbits, is 3.826.[2]

See also

References

  1. ^ “2011 GA”. Minor Planet Center. 10 June 2011.
  2. ^ a b c “JPL Small-Body Database Browser: (2011 GA)” (last observation: 2023-11-18; arc: 4614 days). Jet Propulsion Laboratory. Retrieved 13 January 2026.
  3. ^ “ABSOLUTE MAGNITUDE (H)”. NASA. Archived from the original on 2 March 2001.
  4. ^ “MPEC 2011-G12 : 2011 GA”. www.minorplanetcenter.net. Retrieved 14 January 2026.
  5. ^ a b “2011 GA, 1998 HH49, 2019 HH4, 2003 UC20, 2021 SZ4”. echo.jpl.nasa.gov. 14 November 2023. Retrieved 13 January 2026.
  6. ^ “JPL Small-Body Database Browser: (2011 GA) – Close-Approach Data”. Jet Propulsion Laboratory. Retrieved 5 May 2015.