(308242) 2005 GO21

(308242) 2005 GO₂₁
	Goldstone radar image of asteroid 2005 GO21; taken on 17 June 2012
Discovery
Discovered by	Siding Spring Srvy.
Discovery site	Siding Spring Obs.
Discovery date	1 April 2005
Designations
MPC designation	(308242) 2005 GO21
Minor planet category	Aten · NEO · PHA
Orbital characteristics
	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)
Semi-major axis	0.75324 AU (112.683 Gm)
Eccentricity	0.33992
Orbital period (sidereal)	0.65 yr (238.8 d)
Mean anomaly	19.462°
Mean motion	1.5077°/day
Inclination	24.926°
Longitude of ascending node	272.70°
Argument of perihelion	156.62°
Earth MOID	0.0452219 AU (6.76510 Gm)
Physical characteristics
Mean diameter	~1.6 km
Synodic rotation period	11.00 h
Absolute magnitude (H)	16.5

(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

^ ^a ^b "MPEC 2005-G31 : 2005 GO21". IAU Minor Planet Center. 5 April 2005. Retrieved 18 June 2012. (K05G21O)
^ ^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.
^ ^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.
^ "JPL Small-Body Database Search Engine: PHAs and H < 17 (mag)". JPL Solar System Dynamics. Retrieved 20 November 2011.
^ "JPL Close-Approach Data: 308242 (2005 GO21)" (last observation: 2012-06-17; arc: 7.21 years). Retrieved 18 June 2012.

External links

(308242) 2005 GO21 at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
(308242) 2005 GO21 at ESA–space situational awareness
- Ephemerides · Observations · Orbit · Physical properties · Summary
(308242) 2005 GO21 at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

Zdroj:https://en.wikipedia.org?pojem=(308242)_2005_GO21
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[MPEC2005-G31-1] "MPEC 2005-G31 : 2005 GO21". IAU Minor Planet Center. 5 April 2005. Retrieved 18 June 2012. (K05G21O)

[jpldata-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.

[Goldstone-3] Dr. Lance A. M. Benner (18 June 2012). "(308242) 2005 GO21 Goldstone Radar Observations Planning". NASA/JPL Asteroid Radar Research. Retrieved 18 June 2012.

[jpl-search-4] "JPL Small-Body Database Search Engine: PHAs and H < 17 (mag)". JPL Solar System Dynamics. Retrieved 20 November 2011.

[jpl-close-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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