(532093) 2013 HV ₁₅₆

Asteroid 2013 HV 156
Properties of the orbit ( animation ) Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type	SDO , "Distant Object"
Major semi-axis	47.758  AU
eccentricity	0.177
Perihelion - aphelion	39.314 AU - 56.202 AU
Inclination of the orbit plane	18.1 °
Length of the ascending node	168.6 °
Argument of the periapsis	181.4 °
Time of passage of the perihelion	October 10, 2091
Sidereal period	330 a 0.6 M
Mean orbital velocity	4.275 km / s
Physical Properties
Medium diameter	approx. 447 km
Albedo	0.06-0.09
Absolute brightness	5.2 - 5.5 mag
history
Explorer	Pan-STARRS : B. Gibson T. Goggia N. Primak A. Schultz M. Willman
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 HV ₁₅₆ is a large trans-Neptunian object in the Kuiper Belt , which is classified as a Scattered Disk Object (SDO) in terms of rail dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2013 HV ₁₅₆ was tested on April 19, 2013 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 17, 2016.

After its discovery, in 2013 HV _{156 could be identified} on photos up to June 15, 2001, which were taken as part of the Sloan Digital Sky Survey program (SDSS) at the Apache Point Observatory , and thus its observation period at 12 Extend years to more accurately calculate its orbit. In December 2018, a total of 171 observations were made over a period of 17 years. The last observation so far was again carried out in May 2018 at the Pan-STARRS telescope. (As of March 6, 2019)

properties

Orbit

2013 HV ₁₅₆ orbits the sun in 330.05 years on a slightly elliptical orbit between 39.31  AU and 56.20 AU from its center. The orbit eccentricity is 0.177, the orbit is 18.13 ° inclined to the ecliptic . The planetoid is currently 47.66 AU from the Sun. He will next pass perihelion in 2091, so the last perihelion should have occurred in 1761.

Marc Buie ( DES ) classifies the planetoid as SDO , 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 lists it as "other TNO" , which means it is definitely not a Cubewano or Resonantes KBO .

size

A diameter of 447 km is currently assumed, based on a reflectivity of 6% and an absolute brightness of 5.5  ^m . Assuming a diameter of 447 km, this results in a total surface of about 628,000 km ² . The apparent brightness of 2013 HV ₁₅₆ is 22.22  ^m .

Since it can be assumed that 2013 HV ₁₅₆ is in hydrostatic equilibrium due to its size and therefore has to be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown believes that 2013 HV ₁₅₆ may be a dwarf planet.

Determination of the diameter for 2013 HV ₁₅₆

year	Dimensions km	source
2018	404.0	Johnston
2018	447.0	Brown
The most precise determination is marked in bold .

See also

• List of trans-Neptunian objects
• List of dwarf planets of the solar system
• List of asteroids
• List of moons from asteroids

Web links

• How many dwarf planets are there in the outer solar system? Current list of the largest TNOs from Mike Brown
• Free the dwarf planets! Mike Brown's column on the IAU and the dwarf planets regarding their classifications (23 August 2011)

Individual evidence

1. ^ ^{A b} Marc W. Buie : Orbit Fit and Astrometric record for 13HV156 . SwRI (Space Science Department). Retrieved March 6, 2019.
2. ↑ ^{a b c} (532093) 2013 HV156 at the IAU Minor Planet Center (English) Retrieved March 6, 2019.
3. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
4. ↑ MPC : MPEC 2016-O188: 2013 HV156 . IAU . July 17, 2016. Accessed March 6, 2019.
5. ↑ (532093) 2013 HV156 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 6, 2019.
6. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 6, 2019.
7. ^ ^{A b} Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 6, 2019.
8. ↑ (532093) 2013 HV156 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 6, 2019.