2017 FO 161

from Wikipedia, the free encyclopedia
Asteroid
2017 FO 161
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO or
Centaur ,
"Distant Object"
Major semi-axis 61.515  AU
eccentricity 0.45
Perihelion - aphelion 33.86 AU - 89.17 AU
Inclination of the orbit plane 54.1 °
Length of the ascending node 165 °
Argument of the periapsis 145.4 °
Time of passage of the perihelion January 28, 2163
Sidereal period 482 a 5.8 M.
Mean orbital velocity 3.766 km / s
Physical Properties
Medium diameter approx. 373 km
Albedo 0.08-0.09
Absolute brightness 5.2 - 5.6 mag
history
Explorer Scott S. Sheppard
Chadwick A. Trujillo
Date of discovery 23rd March 2017
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

2017 FO 161 is a large trans-Neptunian object in the Kuiper Belt , which is classified as a Scattered Disk Object (SDO) or a centaur in terms of orbital dynamics . Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2017 FO 161 was discovered on March 23, 2017 by Scott Sheppard and Chad Trujillo with the 4.0 m Víctor M. Blanco telescope (DECam) at the Cerro Tololo Observatory ( Chile ). The discovery was announced on April 2, 2018.

The observation arc of the planetoid begins with the official discovery observation on March 23, 2017. Since then, the planetoid has been observed through various earth-based telescopes. In February 2019, a total of 14 observations were available over a period of almost a year. The last observation so far was carried out in March 2018 at the Las Campanas Observatory (Chile). (As of March 14, 2019)

properties

Orbit

2017 FO 161 orbits the sun in 482.48 years in a strongly elliptical orbit between 33.86  AU and 89.17 AU from its center. The eccentricity of the orbit is 0.450, the orbit is inclined at 54.05 ° with respect to the ecliptic . The planetoid is currently 35.08 AU from the Sun. The next time it passes through perihelion in 2163, the last perihelion should have been in 1680.

Marc Buie ( DES ) classifies the planetoid as SDO or centaur , while the Minor Planet Center also classifies it as SDO; the latter also generally lists it as a “distant object” .

size

A diameter of 373 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.6  m . Based on this diameter, the total surface area is around 437,000 km 2 . The apparent brightness of 2017 FO 161 is 24.25  m .

Since it is conceivable that 2017 FO 161 is in hydrostatic equilibrium due to its size and could therefore be largely round, it may meet the criteria for classification as a dwarf planet . Mike Brown believes that it is in 2017 FO 161 to perhaps is a dwarf planet.

Provisions of the diameter for 2017 FO 161
year Dimensions km source
2018 404.0 Johnston
2018 373.0 Brown
The most precise determination is marked in bold .

See also

Web links

Individual evidence

  1. ^ A b c Marc W. Buie : Orbit Fit and Astrometric record for 17FO161 . SwRI (Space Science Department). Retrieved March 15, 2019.
  2. ↑ a b c MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 15, 2019.
  3. ^ A b Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 15, 2019.
  4. ↑ a b c 2017 FO161 at the IAU Minor Planet Center (English) Retrieved March 15, 2019.
  5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  6. ↑ MPC : MPEC 2018-G10: 2017 FO161 . IAU . April 2, 2018. Retrieved March 15, 2019.
  7. ↑ 2017 FO161 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 15, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  8. ↑ 2017 FO161 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  9. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 15, 2019.