(523742) 2014 Item 85

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Asteroid
(523742) 2014 TZ 85
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type RKBO 4: 7 ,
"Distant Object"
Major semi-axis 43.509  AU
eccentricity 0.257
Perihelion - aphelion 32,314 AU - 54,704 AU
Inclination of the orbit plane 14.9 °
Length of the ascending node 337 °
Argument of the periapsis 333.1 °
Time of passage of the perihelion February 23, 1895
Sidereal period 287 a 0 M
Mean orbital velocity 4.479 km / s
Physical Properties
Medium diameter approx. 501 km
Albedo 0.07-0.09
Absolute brightness 4.8 likes
history
Explorer Pan-STARRS :
B. Gibson
T. Goggia
N. Primak
A. Schultz
M. Willman
Date of discovery October 31, 2012
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.

(523742) 2014 TZ 85 is a large trans-Neptunian object that is classified as either a resonant KBO (4: 7 resonance) or, more generally, as a “distant object” . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2014 TZ 85 was tested on October 31, 2012 by an astronomical team consisting of B. Gibson, T. Goggia, N. Primak, A. Schultz and M. Willman with the 1.8 m Pan-STARRS telescope (PS1 ) discovered at Haleakalā Observatory ( Maui ). The discovery was announced on July 17, 2016, the asteroid was given the minor planet number 523742 on September 25, 2018 .

After its discovery, TZ 85 could be identified in photos up to October 16, 2011, which were also taken with Pan-STARRS, and thus its observation period was extended by one year in order to calculate its orbit more precisely. In October 2018, there were a total of 105 observations over a period of 7 years. The last observation to date was again carried out with Pan-STARRS in February 2018. (As of February 22, 2019)

properties

Orbit

2014 TZ 85 orbits the sun in 287.00 years on a slightly elliptical orbit between 32.31  AU and 54.70 AU from its center. The orbital eccentricity is 0.257, the web is 14.93 ° to the ecliptic inclined . The planetoid is currently 54.05 AU from the Sun. He passed through perihelion for the last time in 1895, so the next perihelion is likely to take place in 2182.

Marc Buie ( DES ) classifies the planetoid as RKBO 4: 7 , while the Minor Planet Center classifies it generally as a “Distant Object” and as a non-SDO.

Size and rotation

A diameter of around 501 km is currently assumed, based on a reflectivity of 7% and an absolute brightness of 5.0  m . The apparent brightness of 2014 TZ 85 is 22.21  m .

Since it can be assumed that 2014 TZ 85 is in hydrostatic equilibrium due to its size and must therefore be largely round, it should meet the criteria for being classified as a dwarf planet . Mike Brown assumes that 2014 TZ 85 is likely a dwarf planet.

Provisions of the diameter for 2014 TZ 85
year Dimensions km source
2018 486.0 Johnston
2018 501.0 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 523742 . SwRI (Space Science Department). Retrieved February 22, 2019.
  2. ↑ a b c (523742) 2014 TZ85 at the IAU Minor Planet Center (English) Retrieved on February 22, 2019.
  3. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  4. ↑ MPC : MPEC 2016-098: 2014 TZ85 . IAU . July 17, 2016. Retrieved February 22, 2019.
  5. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved February 22, 2019.
  6. ↑ (523742) 2014 TZ85 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 22, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  7. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved February 22, 2019.
  8. ↑ (523742) 2014 TZ85 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 February 22, 2019.
  10. ^ Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved February 22, 2019.