(472271) 2014 AT 33

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Asteroid
(472271) 2014 AT 33
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 42.869  AU
eccentricity 0.154
Perihelion - aphelion 36.285 AU - 49.453 AU
Inclination of the orbit plane 17.4 °
Length of the ascending node 236.6 °
Argument of the periapsis 269.5 °
Time of passage of the perihelion November 5, 2087
Sidereal period 280 a 8.3 M
Mean orbital velocity 4.512 km / s
Physical Properties
Medium diameter approx. 490 km
Albedo 0.07-0.09
Absolute brightness 4.7 - 5.1 mag
history
Explorer Mount Lemmon Survey
Date of discovery October 22, 2014
Another name 2010 TQ 182
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.

(472271) 2014 UM 33 is a large Trans-Neptunian object that is classified as an extended Scattered Disc Object (DO) or as a Cubewano in terms of orbital dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2014 UM 33 was discovered on October 22, 2014 by a team of astronomers as part of the Mount Lemmon Survey with the 1.52 m telescope at the Mount Lemmon Observatory ( Arizona ). The discovery was announced on August 18, 2015, the planetoid was given the minor planet number 472271 .

After its discovery, UM 33 in 2014 could be identified on photos up to October 16, 2003, which were taken as part of the Near Earth Asteroid Tracking Program at the Palomar Observatory , thus extending its observation period by 11 years calculate its orbit more precisely. In April 2017, a total of 111 observations were made over a period of 12 years. The last observation so far was carried out in December 2017 as part of the Pan-STARRS program at the Haleakalā Observatory ( Maui ). (As of February 21, 2019)

properties

Orbit

2014 UM 33 orbits the sun in 280.69 years on a slightly elliptical orbit between 36.28  AU and 49.45 AU from its center. The orbit eccentricity is 0.154, the orbit is 17.42 ° inclined to the ecliptic . The planetoid is currently 43.65 AU from the sun. He will next pass perihelion in 2087, so the last perihelion should have occurred in 1807.

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 Archive runs it against it as Cubewano , where it to the ground dynamically "hot" classical KBO would belong.

Size and rotation

At present, a diameter of about 490 km is assumed, based on a reflectivity of 7% and an absolute brightness of 5.1  m ; however, this is subject to some uncertainties, since the general diameter estimates are between 320 and 720 km. The apparent brightness of 2014 UM 33 is 21.44  m .

Since it can be assumed that 2014 UM 33 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 expects that it is at 2,014 UM 33 to possibly is a dwarf planet.

Provisions of the diameter for 2014 UM 33
year Dimensions km source
2018 509.0 Johnston
2018 490.0 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 472271 . SwRI (Space Science Department). Retrieved February 21, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved February 21, 2019.
  3. ↑ a b c (472271) 2014 UM33 at the IAU Minor Planet Center (English) Retrieved on February 21, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2015-Q13: 2014 UM33 = 2010 TQ182 . IAU . August 18, 2015. Retrieved February 21, 2019.
  6. ↑ (472271) 2014 UM33 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 21, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  7. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved February 21, 2019.
  8. ↑ (472271) 2014 UM33 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 21, 2019.