- 2003 YN107
Infobox Planet | discovery=yes | physical_characteristics = yes | bgcolour=#FFFFC0
name=mp|2003 YN|107
discoverer=LINEAR
discovered=December 20 ,2003
alt_names="none"
mp_category=Aten
epoch=October 22 ,2004 (JD 2453300.5)
semimajor=149.212 Gm (0.997 AU)
perihelion=146.125 Gm (0.977 AU)
aphelion=152.300 Gm (1.018 AU)
eccentricity=0.021
period=363.846 d (1.00 a)
inclination=4.267°
asc_node=268.204°
arg_peri=102.736°
mean_anomaly=19.396°
avg_speed=29.82 km/s
dimensions=0.010–0.030 km
mass=~1–28×106 kg
density=2? g/cm³
surface_grav=~3–8×10-6 m/s²
escape_velocity=~5–16×10-6 km/s
rotation=? d
spectral_type=?
abs_magnitude=26.21
albedo=0.10?
single_temperature=~279 Kmp|2003 YN|107 (also written 2003 YN107) is a very small
Near-Earth object . It was discovered by the Lincoln Near Earth Asteroid Research (LINEAR) system in orbit around theSun onDecember 20 ,2003 . Its diameter is approximately 10 to 30 metres, which is near the most commonly used 10-metre demarcation line betweenmeteoroid s andasteroid s. mp|2003 YN|107 is onNASA 's Earth Close Approach list, and is estimated to miss the Earth by 0.0599 AU.It revolves around the Sun on an Earth-like, almost circular, orbit. Its
orbital period of 363.846day s also is very close to theSidereal year . Its most remarkable properties are that it has kept a distance of less than 0.1 AU (15 Gm or 15 millionkilometre s) in the time from1996 to2006 and that it slowly orbits theEarth during one year. However, mp|2003 YN|107 is no secondmoon , as it is not bound to the Earth. It is the first discovered member of a postulated group of coorbital objects, orquasi-satellite s, which show these path characteristics. Other members of this group include10563 Izhdubar ,54509 YORP , mpl|(66063) 1998 RO|1, mpl|(85770) 1998 UP|1, and mpl|(85990) 1999 JV|6.Before
1996 , the asteroid had been on a so-calledhorseshoe orbit around the sun, along the Earth's orbit. After2006 , it had regained such an orbit. In that, it is very similar to the object mpl|2002 AA|29. Apparently, this kind of orbit change is common for coorbital objects. mp|2002 AA|29 will become a quasi-satellite of the Earth in approximately 600 years.ee also
*
Co-orbital moon
*Natural satellite
*Quasi-satellite External links
* [http://neo.jpl.nasa.gov/neo/close.html NASA's Near-Earth Object close approach tables]
* [http://newton.dm.unipi.it/cgi-bin/neodys/neoibo?objects:2003YN107;main NEODyS' information on mp|2003 YN|107]
* [http://science.nasa.gov/headlines/y2006/09jun_moonlets.htm Corkscrew Asteroid] , Dr. Tony Phillips, Science@NASA, June 9, 2006.
Wikimedia Foundation. 2010.