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by | Mar 16, 2018 | Hosta

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(308242) 2005 GO21 is a large Aten near-Earth asteroid and potentially hazardous object.[2] It has a well determined orbit with an observation arc of 7 years and an uncertainty parameter of 0.[2] It was discovered on 1 April 2005 by the Siding Spring Survey at an apparent magnitude of 18.1 using the 0.5-metre (20 in) Uppsala Southern Schmidt Telescope.[1]

Based on an absolute magnitude of 16.4,[2] the asteroid has an estimated diameter of 1.6 km (within a factor of two).[3] (308242) 2005 GO21 is the largest potentially hazardous asteroid (PHA) discovered in 2005.[4] On 21 June 2012 it passed Earth at a distance of 0.043963 AU (6,576,800 km; 4,086,600 mi).[5] The 2012 passage was studied with radar using Goldstone and Arecibo.[3]

References

  1. ^ a b "MPEC 2005-G31 : 2005 GO21". IAU Minor Planet Center. 5 April 2005. Retrieved 18 June 2012. (K05G21O)
  2. ^ a b c d e f g "JPL Small-Body Database Browser: 308242 (2005 GO21)" (last observation: 2012-06-17; arc: 7.21 years). Jet Propulsion Laboratory. Retrieved 7 April 2016.
  3. ^ a b c d Dr. Lance A. M. Benner (18 June 2012). "(308242) 2005 GO21 Goldstone Radar Observations Planning". NASA/JPL Asteroid Radar Research. Retrieved 18 June 2012.
  4. ^ "JPL Small-Body Database Search Engine: PHAs and H < 17 (mag)". JPL Solar System Dynamics. Retrieved 20 November 2011.
  5. ^ "JPL Close-Approach Data: 308242 (2005 GO21)" (last observation: 2012-06-17; arc: 7.21 years). Retrieved 18 June 2012.

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