2014 OL339

2014 OL339
Discovery
Discovered by EURONEAR
Discovery date July 29, 2014
Designations
MPC designation 2014 OL339
Aten asteroid,[1][2]
Venus crosser,
Earth crosser
Orbital characteristics[2][3][4]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 1
Observation arc 381 days (1.04 yr)
Aphelion 1.459798 AU (218.3827 Gm)
Perihelion 0.538860 AU (80.6123 Gm)
0.999329 AU (149.4975 Gm)
Eccentricity 0.460778
1.00 yr (364.89 d)
250.341°
0° 59m 11.76s / day
Inclination 10.18716°
252.1955°
289.6747°
Earth MOID 0.0183585 AU (2.74639 Gm)
Jupiter MOID 3.53678 AU (529.095 Gm)
Physical characteristics
Dimensions 80–180 m[a][5]
22.9[2]

    2014 OL339 (also written 2014 OL339) is an Aten asteroid that is a temporary quasi-satellite of Earth, the fourth known Earth quasi-satellite.[6]

    Discovery

    2014 OL339 was discovered on July 29, 2014 by Farid Char of the Chilean University of Antofagasta. The actual observers were O. Vaduvescu and V. Tudor, observing from the Roque de los Muchachos Observatory for the EURONEAR project with the Isaac Newton Telescope. The intended target of the program was the Apollo asteroid 2013 VQ4 but F. Char identified 2014 OL339 as a streak near the edge of the observed field.[7] As of 14 August 2015, it has been observed 39 times with an observation arc of 381 days.[2]

    Orbit and orbital evolution

    2014 OL339 is currently an Aten asteroid (Earth-crossing but with a period less than a year). Its semi-major axis (currently 0.9994 AU) is similar to that of Earth (0.9992 AU), but it has a relatively high eccentricity (0.4607) and moderate orbital inclination (10.1910°). Gravitational interaction with Earth causes its orbit to change so that its average period is one year (This means it alternates between being an Aten asteroid and being an Apollo asteroid.) Its mean longitude (around the Sun) is similar to that of Earth, which means that it is fairly close to Earth (less than about 1.5 AU). This makes it a quasi-satellite. It moves in a kidney-shaped path going from east to west relative to Earth ("retrograde", the opposite way from the Moon). The relative mean longitude compared to Earth (that is, its mean longitude minus that of Earth) librates around zero. This means that the center of the "kidney" moves back and forth over a period of years, from being in front of Earth to being behind Earth, but this movement is centered on Earth.[6]

    It became a quasi-satellite at least 775 years ago and will stop being that 165 years from now after a "close" encounter with Earth (0.13 AU). This quasi-satellite episode will have had a duration of around a thousand years or more, but less than 2,500 years. Before and after this episode it passes in and out of other types of co-orbital orbits, such as being a trojan or a "passing object" (one whose relative longitude to Earth can attain any value, which is not the case for a quasi-satellite or a Trojan).[6]

    Physical properties

    With an absolute magnitude of 22.8, it has a diameter in the range 80–180 meters (for an assumed albedo range of 0.04–0.20, respectively).

    See also

    Notes

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

    References

    1. ↑ List Of Aten Minor Planets
    2. 1 2 3 4 "2014 OL339". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 3678630. Retrieved 4 April 2016.
    3. ↑ AstDys-2 on 2014 OL339 Retrieved 2014-10-22
    4. ↑ NEODyS-2 on 2014 OL339 Retrieved 2014-10-22
    5. ↑ Absolute-magnitude conversion table (H)
    6. 1 2 3 de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl. "Asteroid 2014 OL339: yet another Earth quasi-satellite". Monthly Notices of the Royal Astronomical Society. 445 (3): 2985–2994. arXiv:1409.5588Freely accessible. Bibcode:2014MNRAS.445.2985D. doi:10.1093/mnras/stu1978.
    7. ↑ Discovery account
    Further reading

    External links

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