(493480) 2014 YZ 49

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Asteroid
(493480) 2014 YZ 49
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 40.293  AU
eccentricity 0.02
Perihelion - aphelion 39.506 AU - 41.081 AU
Inclination of the orbit plane 17.2 °
Length of the ascending node 131 °
Argument of the periapsis 54.7 °
Time of passage of the perihelion June 7, 2021
Sidereal period 255 a 9.2 M
Mean orbital velocity 4.654 km / s
Physical Properties
Medium diameter approx. 358 km
Albedo 0.08-0.09
Absolute brightness 5.3 - 5.7 mag
history
Explorer Pan-STARRS :
B. Gibson
T. Goggia
N. Primak
A. Schultz
M. Willman
Date of discovery December 29, 2014
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.

(493480) 2014 YZ 49 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

2014 YZ 49 was used on December 29, 2014 by an astronomical team consisting of B. Gibson, T. Goggia, N. Primak, A. Schultz and M. Willman, as part of the Pan-STARRS project with the 1.8-m –Ritchey Chretien – Telescope (PS1) discovered at Haleakalā Observatory ( Maui ). The discovery was announced on July 16, 2016, the planetoid was later given the minor planet number 493480 by the IAU .

After its discovery, in 2014 YZ 49 could be identified in photos up to December 25, 2003, which were taken as part of the Sloan Digital Sky Survey program (SDSS) at the Apache Point Observatory ( New Mexico ), thus reversing 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 May 2017, a total of 108 observations over a period of 14 years were available. The last observation so far was carried out in April 2017 at the Purple Mountain Observatory ( People's Republic of China ). (As of March 17, 2019)

properties

Orbit

2014 YZ 49 orbits the sun in 255.77 years in an almost circular orbit between 39.50  AU and 41.08 AU from its center. The orbit eccentricity is 0.020, the orbit is 17.20 ° inclined to the ecliptic . The planetoid is currently 39.51 AU from the Sun. He will next pass perihelion in 2021, so the last perihelion should have occurred in 1765.

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 2014 YZ 49 is 21.29  m .

Since it is conceivable that 2014 YZ 49 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 2014 YZ 49 to perhaps is a dwarf planet.

Provisions of the diameter for 2014 YZ 49
year Dimensions km source
2018 386.0 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 493480 . SwRI (Space Science Department). Retrieved March 17, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 17, 2019.
  3. ↑ a b c (493480) 2014 YZ49 at the IAU Minor Planet Center (English) Retrieved March 17, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2016-027: 2014 YZ49 . IAU . July 16, 2016. Retrieved March 17, 2019.
  6. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 17, 2019.
  7. ↑ (493480) 2014 YZ49 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 17, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  8. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 17, 2019.
  9. ↑ (493480) 2014 YZ49 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 17, 2019.