2013 BS45

2013 BS45
Discovery
Discovered by James V. Scotti(Spacewatch)
Discovery date January 20, 2013
Designations
MPC designation 2013 BS45
Aten NEO,[1][2]
Earth crosser
Orbital characteristics[2][3][4]
Epoch November 4, 2013 (JD 2456600.5)
(Uncertainty=2)
Aphelion 1.0811847 AU
Perihelion 0.9136373 AU
0.9974110 AU
Eccentricity 0.0839911
1.0 y (363.8394 d)
183.97349°
Inclination 0.786272°
85.3764°
145.9750°
Physical characteristics
Dimensions 20-40 m[a][5]
25.9[2]

    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

    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

    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]


    Origin

    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

    Notes

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

    References

    1. ↑ List Of Aten Minor Planets
    2. ↑ 2.0 2.1 2.2 2013 BS45 at the JPL Small-Body Database
    3. ↑ AstDys-2 on 2013 BS45 Retrieved 2013-05-11
    4. ↑ NEODyS-2 on 2013 BS45 Retrieved 2013-05-11
    5. ↑ Absolute-magnitude conversion table (H)
    6. ↑ 6.0 6.1 6.2 6.3 6.4 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.
    7. ↑ Discovery MPEC
    8. ↑ 8.0 8.1 MPC data on 2013 BS45
    9. ↑ 9.0 9.1 9.2 JPL's Solar System Dynamics data on 2013 BS45
    10. ↑ de la Fuente Marcos, C.; de la Fuente Marcos, R. (February 12, 2015). "Geometric characterization of the Arjuna orbital domain". Astronomische Nachrichten 336 (1): 5–22. arXiv:1410.4104. Bibcode:2015AN....336....5D. doi:10.1002/asna.201412133.
    Further reading

    External links