(523634) 2010 AH 2

from Wikipedia, the free encyclopedia
Asteroid
(523634) 2010 AH 2
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 40.439  AU
eccentricity 0.045
Perihelion - aphelion 38.621 AU - 42.257 AU
Inclination of the orbit plane 18.1 °
Length of the ascending node 127.7 °
Argument of the periapsis 56.4 °
Time of passage of the perihelion February 24, 2049
Sidereal period 257 a 1.9 M
Mean orbital velocity 4.645 km / s
Physical Properties
Medium diameter approx. 302 km
Albedo 0.08-0.09
Absolute brightness 5.8 - 6.0 mag
history
Explorer Spacewatch
Date of discovery January 6, 2010
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.

(523634) 2010 AH 2 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 orbit dynamics. Due to its size, the asteroid is one of the dwarf planet candidates .

discovery

2010 AH 2 was discovered on January 6, 2010 by a team of astronomers as part of the Spacewatch project with the 1.8 m Ritchey Chretien telescope (PS2) at the Kitt Peak Observatory ( Arizona ). The discovery was announced on 18 March 2010, the asteroid was on 25 September 2018 the IAU , the Minor Planet -number 523 634 .

After its discovery, in 2010 AH 2 could be identified on photos taken as part of the Sloan Digital Sky Survey (SDSS) program at Apache Point Observatory ( New Mexico ) going back to February 1, 2003 and so on extend its observation period by seven years in order to calculate its orbit more precisely. Since then, the planetoid has been observed through various earth-based telescopes. In October 2018, a total of 198 observations were made over a period of 16 years. The last observation so far was carried out in March 2018 at the Pan-STARRS telescope (PS1) ( Maui ). (As of April 2, 2019)

properties

Orbit

2010 AH 2 orbits the sun in 257.16 years in an almost circular orbit between 38.62  AU and 42.26 AU from its center. The orbit eccentricity is 0.045, the orbit is 18.06 ° inclined to the ecliptic . Currently, the planetoid is 39.12 AU from the sun. He will next pass through perihelion in 2049, so the last perihelion should have taken place in 1791.

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 302 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 6.0  m . Based on this diameter, the total surface area is around 287,000 km 2 . The apparent magnitude of 2010 AH 2 is 21.95  m .

Since it is conceivable that 2010 AH 2 is in hydrostatic equilibrium due to its size and could thus be largely round, it may meet the criteria for classification as a dwarf planet . Mike Brown expects that it is at 2010 AH 2 to perhaps is a dwarf planet.

Provisions of the diameter for 2010 AH 2
year Dimensions km source
2018 306.0 Johnston
2018 302.0 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 523634 . SwRI (Space Science Department). Retrieved April 2, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved April 2, 2019.
  3. ↑ a b c (523634) 2010 AH2 at the IAU Minor Planet Center (English) Retrieved April 2, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2010-F21: 2010 AH2 . IAU . March 18, 2010. Retrieved April 2, 2019.
  6. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved April 2, 2019. Reference there: MPC 111778
  7. ↑ (523634) 2010 AH2 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved April 2, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  8. ↑ MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Retrieved April 2, 2019.
  9. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved April 2, 2019.
  10. ↑ (523634) 2010 AH2 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  11. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved April 2, 2019.