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2003 YN107 is a tiny asteroid, classified as a near-Earth object of the Aten group moving in a 1:1 mean-motion resonance with Earth. Because of that, it is in a co-orbital configuration relative to Earth.
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A temporary satellite is an object which has been captured by the gravitational field of a planet and thus has become the planet's natural satellite, but, unlike irregular moons of the larger outer planets of the Solar System, will eventually either leave its orbit around the planet or collide with the planet. The only observed examples are 2006 RH120, a temporary satellite of Earth for twelve months from July 2006 to July 2007, 2020 CD3 and 2022 NX1. Some defunct space probes or rockets have also been observed on temporary satellite orbits.
2019 LF6 is a near-Earth object of the Atira group. After 2021 PH27, it has the second-smallest semi-major axis among the known asteroids (0.555 AU), beating the previously-held record of 2019 AQ3. It orbits the Sun in 151 days.
2020 PN1 is a sub-kilometer asteroid, classified as a near-Earth object of the Aten group, that is a temporary horseshoe companion to the Earth. There are dozens of known Earth horseshoe librators, some of which switch periodically between the quasi-satellite and the horseshoe co-orbital states.
2020 PP1 is a sub-kilometer asteroid, classified as a near-Earth object of the Apollo group, that is a temporary quasi-satellite of the Earth. There are over a dozen known Earth quasi-satellites, some of which switch periodically between the quasi-satellite and horseshoe co-orbital states.
References
- 1 2 "(76146) = 2000 EU16 = 2002 TO288". Minor Planet Center. International Astronomical Union. Retrieved 13 December 2021.
- 1 2 3 "JPL Small-Body Database Browser: 76146 (2000 EU16)" (2021-10-22 last obs.). Jet Propulsion Laboratory . Retrieved 13 December 2021.
- ↑ The analemma criterion: accidental quasi-satellites are indeed true quasi-satellites C. de la Fuente Marcos & R. de la Fuente Marcos, Monthly Notices of the Royal Astronomical Society, Volume 462, Issue 3, 01 November 2016, Pages 3344–3349
