(532092) 2013 HU 156

from Wikipedia, the free encyclopedia
Asteroid
2013 HU 156
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type Plutino ,
"Distant Object"
Major semi-axis 39.824  AU
eccentricity 0.123
Perihelion - aphelion 34,926 AU - 44,722 AU
Inclination of the orbit plane 20.8 °
Length of the ascending node 185.3 °
Argument of the periapsis 344.7 °
Time of passage of the perihelion 17th July 1973
Sidereal period 251 a 3.8 M
Mean orbital velocity 4.681 km / s
Physical Properties
Medium diameter approx. 358 km
Albedo 0.08-0.09
Absolute brightness 5.5 - 5.7 mag
history
Explorer Pan-STARRS
Date of discovery April 19, 2013
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.

2013 HU 156 is a large trans-Neptunian object in the Kuiper Belt , which is classified as Plutino in terms of railway dynamics . Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2013 HU 156 was discovered on April 19, 2013 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 announced on July 17, 2016 by a Pan-STARRS team of astronomers consisting of B. Gibson, T. Goggia, N. Primak, A. Schultz, and M. Willman.

After its discovery, HU 156 could be identified on photos up to May 24, 2001, taken as part of the Sloan Digital Sky Survey program (SDSS) at the Apache Point Observatory ( New Mexico ), and thus its observation period was reversed Extend twelve years to more accurately calculate its orbit. Since then, the planetoid has been observed through various earth-based telescopes. In December 2018, a total of 257 observations were available over a period of 17 years. The last observation so far was again carried out in May 2018 at the Pan-STARRS telescope (PS1). (As of March 18, 2019)

properties

Orbit

2013 HU 156 orbits the sun in 251.32 years on a slightly elliptical orbit between 34.92  AU and 44.72 AU from its center. The orbit eccentricity is 0.123, the orbit is inclined 20.78 ° to the ecliptic . Currently, the planetoid is 38.33 AU from the sun. He last passed through perihelion in 1973, so the next perihelion should take place in 2224.

Marc Buie ( DES ) classifies the planetoid as Plutino ( 2: 3 resonance with Neptune ), while the Minor Planet Center does not have a specific classification; the latter lists it as a non-SDO and generally as a “distant object” .

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 brightness of 2013 HU 156 is 21.59  m .

Since it is conceivable that 2013 HU 156 will be in hydrostatic equilibrium due to its size and thus could be largely round, it may meet the criteria for classification as a dwarf planet . Mike Brown believes that it is in 2013 HU 156 to perhaps is a dwarf planet.

Determination of the diameter for 2013 HU 156
year Dimensions km source
2018 352.0 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 13HU156 . SwRI (Space Science Department). Retrieved March 18, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 18, 2019.
  3. ↑ a b c (532092) 2013 HU156 at the IAU Minor Planet Center (English) Retrieved March 18, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2016-0118: 2013 HU156 . IAU . July 17, 2016. Accessed March 18, 2019.
  6. ↑ (532092) 2013 HU156 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 18, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  7. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 18, 2019.
  8. ↑ (532092) 2013 HU156 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 18, 2019.