(308242) 2005 GO21

(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]

(308242) 2005 GO21
Goldstone radar image of asteroid 2005 GO21
taken on 17 June 2012
Discovery[1]
Discovered bySiding Spring Srvy.
Discovery siteSiding Spring Obs.
Discovery date1 April 2005
Designations
(308242) 2005 GO21
Aten · NEO · PHA[2]
Orbital characteristics[2]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc3385 days (9.27 yr)
Aphelion1.0093 AU (150.99 Gm)
Perihelion0.49720 AU (74.380 Gm)
0.75324 AU (112.683 Gm)
Eccentricity0.33992
0.65 yr (238.8 d)
19.462°
1.5077°/day
Inclination24.926°
272.70°
156.62°
Earth MOID0.0452219 AU (6.76510 Gm)
Physical characteristics
Dimensions~1.6 km[3]
11.00 h[2][3]
16.5[2]

    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. "MPEC 2005-G31 : 2005 GO21". IAU Minor Planet Center. 2005-04-05. Retrieved 2012-06-18. (K05G21O)
    2. "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. 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.
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