2013 BS45

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2013 BS45
Discovered by James V. Scotti(Spacewatch)
Discovery date January 20, 2013
MPC designation 2013 BS45
Aten NEO,[1][2]
Earth crosser
Orbital characteristics[2][3][4]
Epoch November 4, 2013 (JD 2456600.5)
Aphelion 1.0811847 AU
Perihelion 0.9136373 AU
0.9974110 AU
Eccentricity 0.0839911
1.0 y (363.8394 d)
Inclination 0.786272°
Physical characteristics
Dimensions 20-40 m[a][5]

2013 BS45, also written 2013 BS45, is a horseshoe companion to the Earth like 3753 Cruithne.[6] Like Cruithne, it does not orbit the Earth and at times it is on the other side of the Sun.

Discovery, orbit and physical properties[edit]

2013 BS45 was discovered by James V. Scotti on January 20, 2013 observing for the Spacewatch project from Kitt Peak (KPNO).[7][8] Its orbit is characterized by low eccentricity (0.084), low inclination (0.79º) and a semi-major axis of 0.9974 AU;[8] it is the most Earth-like among those of asteroids moving in Earth-like orbits.[6] Upon discovery, it was classified as an Aten asteroid but also an Earth crosser by the Minor Planet Center. Its orbit is well determined; as of November 1, 2013 its orbit is based on 87 observations spanning a data-arc of 24 days.[9] 2013 BS45 has an absolute magnitude of 25.9 which gives a characteristic diameter of 30 m.[9] Radar observations indicate that it may be a very rapid rotator with a period of just a few minutes.

Horseshoe companion to the Earth and orbital evolution[edit]

Recent calculations indicate that it follows a horseshoe orbit with respect to the Earth.[6] Its orbital evolution is highly chaotic and its orbit is difficult to predict beyond a few thousand years.[6] It had a close encounter with the Earth on February 12, 2013 at 0.013 AU and it will have another close encounter with our planet on February 11, 2014 at 0.032 AU.[9] Its orbit matches the expected properties of that of an object in the Arjuna-class.[10]


It may have been originated within the Venus-Earth-Mars region or in the main asteroid belt like other Near-Earth Objects, then transition to Amor-class asteroid before entering Earth's co-orbital region.[6]

See also[edit]


  • ^ This is assuming an albedo of 0.20–0.04.


Further reading

External links[edit]