|Discovery date||December 20, 2003|
|Minor planet category||Aten|
|Epoch April 18, 2013 (JD 2456400.5)|
|Aphelion||152.300 Gm (1.00249947 AU)|
|Perihelion||146.125 Gm (0.9749381 AU)|
|149.212 Gm (0.98871878 AU)|
|359.09355 d (0.98 a)|
Average orbital speed
Discovery, orbit and physical properties
It was discovered by the Lincoln Near Earth Asteroid Research (LINEAR) system in orbit around the Sun on December 20, 2003. Its diameter is approximately 10 to 30 metres, which is near the most commonly used 10-metre demarcation line between meteoroids and asteroids. 2003 YN107 is on NASA's Earth Close Approach list, and is estimated to miss the 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 to the Earth and orbital evolution
Its most remarkable properties are that it has kept a distance of less than 0.1 AU (15 Gm or 15 million kilometres) and that it appeared to slowly orbit Earth during one year between 1996 and 2006. However, 2003 YN107 is no second moon, as it is not bound to the 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, (66063) 1998 RO1, (85770) 1998 UP1, and (85990) 1999 JV6. 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 2002 AA29, which will become a quasi-satellite of Earth in approximately 600 years.
- 2002 AA29 — near-Earth asteroid
- 2006 RH120
- Natural satellite
- Arjuna asteroid
- 3753 Cruithne
- 2001 GO2
- 2002 AA29
- 2006 JY26
- 2009 SH2
- 2010 SO16
- 2012 FC71
- 2013 BS45
- JPL Small-Body Database Browser
- Connors, M.; Veillet, C.; Brasser, R.; Wiegert, P.; Chodas, P.; Mikkola, S.; Innanen, K. (August 2004). "Discovery of Earth's quasi-satellite". Meteoritics & Planetary Science 39 (8): 1251–1255. Bibcode:2004M&PS...39.1251C. doi:10.1111/j.1945-5100.2004.tb00944.x.
- Brasser, R.; Innanen, K. A.; Connors, M.; Veillet, C.; Wiegert, P.; Mikkola, S.; Chodas, P. W. (September 2004). "Transient co-orbital asteroids". Icarus 171 (1): 102–109. Bibcode:2004Icar..171..102B. doi:10.1016/j.icarus.2004.04.019.
- de la Fuente Marcos, C.; de la Fuente Marcos, R. (July 2013). "A resonant family of dynamically cold small bodies in the near-Earth asteroid belt". Monthly Notices of the Royal Astronomical Society: Letters 434 (1): L1–L5. arXiv:1305.2825. Bibcode:2013MNRAS.434L...1D. doi:10.1093/mnrasl/slt062.
- MPEC 2003-Y76 : 2003 YN107 (Discovery MPEC)
- NASA's Near-Earth Object close approach tables
- NEODyS' information on 2003 YN107
- Corkscrew Asteroid, Dr. Tony Phillips, Science@NASA, June 9, 2006.
- Horseshoe asteroids and quasi-satellites in Earth-like orbits