2015 BZ 518

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Asteroid
2015 BZ 518
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type DO,
"Distant Object"
Major semi-axis 47.276  AU
eccentricity 0.185
Perihelion - aphelion 38.527 AU - 56.026 AU
Inclination of the orbit plane 11.4 °
Length of the ascending node 44 °
Argument of the periapsis 296.9 °
Time of passage of the perihelion October 25, 2098
Sidereal period 325 a 0.8 M
Mean orbital velocity 4.296 km / s
Physical Properties
Medium diameter approx. 513 km
Albedo 0.08-0.09
Absolute brightness 4.7 - 4.9 mag
history
Explorer Pan-STARRS :
B. Gibson
T. Goggia
N. Primak
A. Schultz
M. Willman
Date of discovery January 24, 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 BZ 518 is a large trans-Neptunian object whose orbit classification is controversial. Because of its size, the asteroid is a dwarf planet candidate .

discovery

2015 BZ 518 was discovered on January 24, 2015 by a team of astronomers , consisting of B. Gibson, T. Goggia, N. Primak, A. Schultz and M. Willman, on images of the 1.8 m Pan-STARRS telescope ( PS1) made on May 10, 2010, discovered at Haleakalā Observatory ( Maui ). The discovery was announced on July 17, 2016.

The asteroid's observation sheet begins with the official discovery observation on May 10, 2010. In September 2018, a total of 148 observations were made over a period of 9 years. The last observation so far was also carried out on the Pan-STARRS telescope in May 2018. (As of February 9, 2019)

properties

Orbit

2015 BZ 518 orbits the sun in 325.07 years on an elliptical orbit between 38.53  AU and 56.03 AU from its center. The orbital eccentricity is 0.185, the orbit is 11.36 ° inclined to the ecliptic . The planetoid is currently 48.61 AU from the Sun and 48.65 AU from Earth . He will next pass through perihelion in 2098, so the last perihelion should have occurred in 1773.

Marc Buie ( DES ) classifies the planetoid as an extended SDO (ESDO or DO ), while the Minor Planet Center generally classifies it as a “distant object” and as a non-SDO. The Johnston's Archives lists it as "other TNO" .

size

A diameter of around 513 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 4.9  m . The apparent magnitude of 2015 BZ 518 is 21.88  m .

Since it can be assumed that 2015 BZ 518 is in hydrostatic equilibrium due to its size and must therefore be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown assumes that 2015 BZ 518 is likely a dwarf planet.

Provisions of the diameter for 2015 BZ 518
year Dimensions km source
2018 509.0 Johnston
2018 513.0 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 15BZ518 . SwRI (Space Science Department). Retrieved February 9, 2019.
  2. ↑ a b c 2015 BZ518 at the IAU Minor Planet Center (English) Accessed February 9, 2019.
  3. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  4. ^ MPC : MPC List Of Transneptunian Objects . IAU . Retrieved February 9, 2019.
  5. ↑ MPC : MPEC 2016-0176: 2015 BZ518 . IAU . July 17, 2016. Retrieved February 9, 2019.
  6. ↑ 2015 BZ518 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 9, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  7. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved February 9, 2019.
  8. ^ A b Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved February 9, 2019.
  9. ↑ 2015 BZ518 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 February 9, 2019.