(495613) 2015 FG 345

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Asteroid
(495613) 2015 FG 345
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type DO (E SDO ) or
CKBO ( «Hot» ),
«Distant Object»
Major semi-axis 42,321  AU
eccentricity 0.13
Perihelion - aphelion 36,809 AU - 47,833 AU
Inclination of the orbit plane 36 °
Length of the ascending node 58.7 °
Argument of the periapsis 222.6 °
Time of passage of the perihelion October 4, 2065
Sidereal period 275 a 3.8 M
Mean orbital velocity 4.541 km / s
Physical Properties
Medium diameter approx. 373 km
Albedo 0.08-0.09
Absolute brightness 5.2 - 5.6 mag
history
Explorer Pan-STARRS
Date of discovery March 18, 2015
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.

(495613) 2015 FG 345 is a large trans-Neptunian object in the Kuiper belt , which is classified as an extended Scattered Disk Object (DO) or as a Cubewano (CKBO) in terms of orbital dynamics. Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2015 FG 345 was discovered on March 18, 2015 by a team of astronomers as part of the Pan-STARRS project with the 1.8 m Ritchey Chretien telescope (PS1) at the Haleakalā Observatory ( Maui ). The discovery was announced on March 10, 2016, the planetoid was later given the minor planet number 495613 by the IAU .

After its discovery, in 2015 FG 345 could be identified on photos up to March 12, 2005, which were taken as part of the Sloan Digital Sky Survey program (SDSS) at the Apache Point Observatory ( New Mexico ), thus changing its observation period Extend ten years to calculate its orbit more accurately. Since then, the planetoid has been observed through various earth-based telescopes. In June 2017 there were a total of 109 observations over a period of 11 years. The last observation so far was carried out in March 2016 at the Konkoly Observatory ( Hungary ). (As of March 13, 2019)

properties

Orbit

2015 FG 345 orbits the sun in 275.32 years on a slightly elliptical orbit between 36.81  AU and 47.83 AU from its center. The orbit eccentricity is 0.130, the orbit is inclined 35.98 ° with respect to the ecliptic . The planetoid is currently 40.24 AU from the sun. The next time it passes through perihelion in 2108, the last perihelion should have occurred in 1790.

Marc Buie ( DES ) classifies the planetoid as an extended SDO (ESDO or DO ), while the Minor Planet Center does not have a specific classification; the latter classifies it as a non-SDO and generally as a “distant object” . The Johnston's Archive, however, lists him as Cubewano , whereby he would belong to the "hot" classic KBO in terms of rail dynamics .

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 magnitude of 2015 FG 345 is 21.25  m .

Since it is conceivable that 2015 FG 345 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 2015 FG 345 to perhaps is a dwarf planet.

Provisions of the diameter for 2015 FG 345
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 Marc W. Buie : Orbit Fit and Astrometric record for 495613 . SwRI (Space Science Department). Retrieved March 13, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 13, 2019.
  3. ↑ a b c (495613) 2015 FG345 at the IAU Minor Planet Center (English) Retrieved on March 13, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2016-E99: 2015 FG345 . IAU . March 10, 2016. Accessed March 13, 2019.
  6. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 13, 2019.
  7. ↑ (495613) 2015 FG345 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 13, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  8. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 13, 2019.
  9. ↑ (495613) 2015 FG345 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  10. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 13, 2019.