(308242) 2005 GO21

(308242) 2005 GO21

Goldstone radar image of asteroid 2005 GO21
taken 17 June 2012.
Discovery[1]
Discovered by Siding Spring Survey (E12)
0.5-m Uppsala Schmidt
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) (Q)
Perihelion 0.49720 AU (74.380 Gm) (q)
0.75324 AU (112.683 Gm) (a)
Eccentricity 0.33992 (e)
0.65 yr (238.8 d)
19.462° (M)
1.5077°/day (n)
Inclination 24.926° (i)
272.70° (Ω)
156.62° (ω)
Earth MOID 0.0452219 AU (6.76510 Gm)
Jupiter MOID 4.25159 AU (636.029 Gm)
Jupiter Tisserand parameter 7.557
Physical characteristics
Dimensions ~1.6 km[3]
11.00 h (0.458 d)
11 hr[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

    1. 1 2 "MPEC 2005-G31 : 2005 GO21". IAU Minor Planet Center. 2005-04-05. Retrieved 2012-06-18. (K05G21O)
    2. 1 2 3 4 5 6 "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. 1 2 3 4 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

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