(308242) 2005 GO21

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(308242) 2005 GO21
2005GO21-20120617.jpg
Goldstone radar image of asteroid 2005 GO21
taken on 17 June 2012
Discovery[1]
Discovered by Siding Spring Srvy.
Discovery site Siding Spring Obs.
Discovery date 1 April 2005
Designations
MPC designation (308242) 2005 GO21
Aten · NEO · PHA[2]
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 3385 days (9.27 yr)
Aphelion 1.0093 AU (150.99 Gm)
Perihelion 0.49720 AU (74.380 Gm)
0.75324 AU (112.683 Gm)
Eccentricity 0.33992
0.65 yr (238.8 d)
19.462°
1.5077°/day
Inclination 24.926°
272.70°
156.62°
Earth MOID 0.0452219 AU (6.76510 Gm)
Physical characteristics
Dimensions ~1.6 km[3]
11.00 h[2][3]
16.5[2]

(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[edit]

  1. ^ a b "MPEC 2005-G31 : 2005 GO21". IAU Minor Planet Center. 2005-04-05. Retrieved 2012-06-18.  (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 (2012-06-18). "(308242) 2005 GO21 Goldstone Radar Observations Planning". NASA/JPL Asteroid Radar Research. Retrieved 2012-06-18. 
  4. ^ "JPL Small-Body Database Search Engine: PHAs and H < 17 (mag)". JPL Solar System Dynamics. Retrieved 2011-11-20. 
  5. ^ "JPL Close-Approach Data: 308242 (2005 GO21)" (last observation: 2012-06-17; arc: 7.21 years). Retrieved 2012-06-18. 

External links[edit]