2015 FJ345
| Discovery Perihelion | 50.785 AU | |
|---|---|---|
| 62.811 AU | ||
| Eccentricity | 0.1915 | |
| 497.81 yr (181,824 d) | ||
| 58.879° | ||
| 0° 0m 7.2s / day | ||
| Inclination | 34.973° | |
| 37.881° | ||
| 77.511° | ||
| Physical characteristics | ||
Mean diameter | ||
| 25.74[8] | ||
| 7.9[1][2] | ||
2015 FJ345 is a
perihelion of almost 51 AU, it belongs to a small and poorly understood group of very distant objects with moderate eccentricities.[7][9] The object is not a dwarf planet candidate
as it only measures approximately 120 kilometers (75 miles) in diameter.
Discovery and naming
2015 FJ345 was first observed on 17 March 2015, by a team of astronomers led by Scott Sheppard of the
Kuiper Cliff using the new wide-field cameras on the Subaru and Cerro Tololo Inter-American Observatory (CTIO) telescopes.[7]
Orbit and classification
2015 FJ345 orbits the Sun at a distance of 50.8–74.8
semi-major axis of 62.81 AU). Its orbit has an eccentricity of 0.19 and an inclination of 35° with respect to the ecliptic.[2]
The object belongs to the same group as perihelia (at 50.8 AU rather than 31–41 AU).
Considered a
planetary embryos in the early Kuiper belt, and resonance interaction with an outward-migrating Neptune. The Kozai mechanism is capable of transferring orbital eccentricity to a higher inclination.[9]
Physical characteristics
2015 FJ345 has a diameter estimated between 117 and 125 kilometers,2004 XR190 ("Buffy"), which is estimated at around 500 kilometres (310 mi), roughly a quarter the size of Pluto. It is therefore not a dwarf planet candidate.[6]
References
- ^ a b c d "2015 FJ345". Minor Planet Center. Retrieved 12 December 2018.
- ^ a b c d "JPL Small-Body Database Browser: (2015 FJ345)" (2016-05-03 last obs.). Jet Propulsion Laboratory. Retrieved 12 December 2018.
- ^ ISBN 3-540-71957-1.
- ^ .
- ^ a b c d e f Johnston, Wm. Robert (7 October 2018). "List of Known Trans-Neptunian Objects". Johnston's Archive. Retrieved 12 December 2018.
- ^ a b c d Brown, Michael E. "How many dwarf planets are there in the outer solar system?". California Institute of Technology. Retrieved 12 December 2018.
- ^ S2CID 118630570.
- ^ "2015 FJ345 – Ephemerides". AstDyS-2, Asteroids – Dynamic Site, Department of Mathematics, University of Pisa, Italy. Retrieved 12 December 2018.
- ^ S2CID 15588453. (Discovery paper)
External links
- List Of Centaurs and Scattered-Disk Objects, Minor Planet Center
- List of Known Trans-Neptunian Objects, Johnston's Archive
- 2015 FJ345 at AstDyS-2, Asteroids—Dynamic Site
- 2015 FJ345 at the JPL Small-Body Database
