2015 BX 518

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Asteroid
2015 BX 518
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 42.841  AU
eccentricity 0.175
Perihelion - aphelion 35,326 AU - 50,355 AU
Inclination of the orbit plane 28.2 °
Length of the ascending node 210.1 °
Argument of the periapsis 52.9 °
Time of passage of the perihelion November 23, 2074
Sidereal period 280 a 4.9 M.
Mean orbital velocity 4.513 km / s
Physical Properties
Medium diameter approx. 358 km
Albedo 0.08-0.09
Absolute brightness 5.6 - 5.7 mag
history
Explorer Pan-STARRS
Date of discovery January 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.

2015 BX 518 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 rail dynamics. Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2015 BX 518 was discovered on January 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 made on September 1, 2018 by a Pan-STARRS astronomical team consisting of J. Bulger, K. Chambers, B. Gibson, T. Goggia, T. Lowe, E. Magnier, N. Primak, A. Schultz, J. Thiel, S. Watters, and M. Willman.

After its discovery, in 2015 BX 518 could be identified in photos up to January 29, 2012, which were also taken as part of the Pan-STARRS program, and thus its observation period was extended by three years in order to calculate its orbit more precisely. So far, the planetoid has only been observed through the Pan-STARRS telescope. In August 2018, there were a total of 83 observations over a period of 6 years. The last observation so far was carried out in January 2018 at the Pan-STARRS telescope (PS1). (As of March 19, 2019)

properties

Orbit

2015 BX 518 orbits the sun in 280.41 years on a slightly elliptical orbit between 35.32  AU and 50.35 AU from its center. The orbit eccentricity is 0.175, the orbit is 28.15 ° inclined to the ecliptic . The planetoid is currently 41.72 AU from the sun. He will next pass through perihelion in 2074, so the last perihelion should have occurred in 1794.

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 358 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.7  m . Based on this diameter, the total surface area is around 403,000 km 2 . The apparent magnitude of 2015 BX 518 is 21.88  m .

Since it is conceivable that 2015 BX 518 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 BX 518 to perhaps is a dwarf planet.

Provisions of the diameter for 2015 BX 518
year Dimensions km source
2018 336.0 Johnston
2018 358.0 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 15BX518 . SwRI (Space Science Department). Retrieved March 19, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 19, 2019.
  3. ↑ a b c 2015 BX518 at the IAU Minor Planet Center (English) Retrieved on March 19, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2018-R01: 2015 BX518 . IAU . September 1, 2018. Retrieved March 19, 2019.
  6. ↑ 2015 BX518 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 19, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  7. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 19, 2019.
  8. ↑ 2015 BX518 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 19, 2019.