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2003 YN107

Near-Earth asteroid

Field	Value
minorplanet	yes
background	#FFC2E0
name
discoverer	LINEAR
discovered	20 December 2003
mp_category	{{Hlist
Aten<ref name	jpl /
orbit_ref
observation_arc	467 days (1.28 yr)
uncertainty	1
epoch	21 November 2025 (JD 2461000.5)
semimajor	0.988840 AU
perihelion	0.975046 AU
aphelion	1.00263 AU
eccentricity	0.0139494
period	0.98 yr (359.2 d)
inclination	4.32089°
asc_node	264.36698°
arg_peri	87.55338°
mean_anomaly	186.0344°
mean_motion	1.00234°/day
avg_speed	29.82 km/s
moid	0.0048282 AU
mean_diameter	10–30 m
abs_magnitude	26.5

| NEO | Aten

**** is a tiny asteroid, classified as a near-Earth object of the Aten group moving in a 1:1 mean-motion resonance with Earth. Because of that, it is in a co-orbital configuration relative to Earth.

Discovery, orbit and physical properties

was discovered by the Lincoln Near Earth Asteroid Research (LINEAR) system in orbit around the Sun on 20 December 2003. Its diameter is approximately 10 to 30 metres. The object is on NASA's Earth Close Approach list, and is estimated to miss Earth by 0.01 AU. It revolves around the Sun on an Earth-like, almost circular, orbit. Its orbital period of 363.846 days also is very close to the sidereal year.

Co-orbital with Earth and orbital evolution

From approximately 1997 to 2006, the asteroid remained within 0.1 AU of Earth and it appeared to slowly orbit Earth. However, is no second moon, as it is not bound to Earth. It is the first discovered member of a postulated group of coorbital objects, or quasi-satellites, which show these path characteristics. Other members of this group include 10563 Izhdubar, 54509 YORP, , , and . Before 1996, the asteroid had been on a so-called horseshoe orbit around the Sun, along the Earth's orbit. After 2006, it had regained such an orbit. This makes it very similar to , which will become a quasi-satellite of Earth in approximately 600 years.

References

"JPL Small-Body Database Browser: (2003 YN107)". [[Jet Propulsion Laboratory]].
(August 2004). "Discovery of Earth's quasi-satellite". [[Meteoritics & Planetary Science]].
(September 2004). "Transient co-orbital asteroids". [[Icarus (journal).
(July 2013). "A resonant family of dynamically cold small bodies in the near-Earth asteroid belt". [[Monthly Notices of the Royal Astronomical Society: Letters]].

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

aten-asteroids earth-co-orbital-asteroids minor-planet-object-articles-(unnumbered) astronomical-objects-discovered-in-2003 horseshoe-orbit

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