Global Information2015 XX169 information
| Discovery | |
|---|---|
| Discovered by | R. G. Matheny Mount Lemmon Srvy. |
| Discovery site | Mount Lemmon Obs. |
| Discovery date | 9 December 2015 |
| Designations | |
Designation | 2015 XX169 |
Minor planet category |
|
| Orbital characteristics[2] | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 1 | |
| Observation arc | 363 days |
| Aphelion | 1.18545 AU |
| Perihelion | 0.81648 AU |
Semi-major axis | 1.00097 AU |
| Eccentricity | 0.18431 |
Orbital period (sidereal) | 1.00149 y (365.79 d) |
Mean anomaly | 345.528° |
| Inclination | 7.640° |
Longitude of ascending node | 256.630° |
Argument of perihelion | 283.587° |
| Earth MOID | 0.0154 AU |
| Physical characteristics | |
| Dimensions | 9–22 m[a][3][4] |
Absolute magnitude (H) | 27.4[2] |
2015 XX169 (also written 2015 XX169) is an Apollo asteroid that is a temporary horseshoe companion to the Earth, the tenth known Earth horseshoe librator.[5] A close encounter with the Earth on 14 December 2015 caused the value of the semi-major axis of 2015 XX169 to drift slowly upwards, and the object evolved from an Aten asteroid to an Apollo asteroid about a year after this close approach.
- ^ List Of Apollo Minor Planets
- ^ a b c "2015 XX169". JPL Small-Body Database. Jet Propulsion Laboratory. SPK-ID: 3736412. Retrieved 6 December 2016.
- ^ "Conversion of Absolute Magnitude to Diameter". Minor Planet Center. Retrieved 14 April 2020.
- ^ Chesley, Steven R.; Chodas, Paul W.; Milani, Andrea; Valsecchi, Giovanni B.; Yeomans, Donald K. (October 2002). "Quantifying the Risk Posed by Potential Earth Impacts" (PDF). Icarus. 159 (2): 425. Bibcode:2002Icar..159..423C. doi:10.1006/icar.2002.6910. Archived from the original (PDF) on 4 November 2003. Retrieved 15 April 2020.
- ^ de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (1 April 2016). "A trio of horseshoes: past, present and future dynamical evolution of Earth co-orbital asteroids 2015 XX169, 2015 YA and 2015 YQ1". Astrophysics and Space Science. 361 (4): 121 (13 pages). arXiv:1603.02415. Bibcode:2016Ap&SS.361..121D. doi:10.1007/s10509-016-2711-6. S2CID 189843906.
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