(315530) 2008 AP 129

from Wikipedia, the free encyclopedia
Asteroid
(315 530) 2008 AP 129
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type DO
"Distant Object"
family Haumea family
Major semi-axis 41.628  AU
eccentricity 0.136
Perihelion - aphelion 35.975 AU - 47.282 AU
Inclination of the orbit plane 27.4 °
Length of the ascending node 14.9 °
Argument of the periapsis 57.2 °
Time of passage of the perihelion October 13, 1980
Sidereal period 268 a 7.1 M
Mean orbital velocity 4.579 km / s
Physical Properties
Medium diameter approx. 490 km
Albedo 0.07-0.10
Rotation period 9.04 ± 0.02 h (0.377 d )
Absolute brightness 4.7 - 5.1 mag
Spectral class C.
history
Explorer Megan E. Schwamb,
Michael E. Brown
Date of discovery January 11, 2008
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.

(315530) 2008 AP 129 is a large trans-Neptunian object that is classified as an extended Scattered Disc Object (DO) and a member of the Haumea family. Because of its size, the asteroid is a dwarf planet candidate .

discovery

2008 AP 129 was discovered on January 11, 2008 by Megan Schwamb and Mike Brown of the California Institute of Technology with the 1.5 m telescope at the Palomar Observatory ( California ). The discovery was announced on October 27, 2009, the planetoid was given the minor planet number 315530 on February 7, 2012 .

After its discovery, in 2008 AP 129 could be identified on photos up to January 9, 1989, which were also taken at the Palomar Observatory, and thus its observation period was extended by 19 years in order to calculate its orbit more precisely. In February 2018, a total of 111 observations were made over a period of 29 years. The last observation so far was made in December 2017 at the Mauna Kea Observatory . (As of February 20, 2019)

properties

Orbit

2008 AP 129 orbits the sun in 268.59 years on a slightly elliptical orbit between 35.97  AU and 47.28 AU from its center. The orbital eccentricity is 0.136, the orbit is 27.40 ° inclined to the ecliptic . Currently, the planetoid is 38.63 AU from the sun. He last passed through perihelion in 1980, so the next perihelion should take place in 2249.

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 asteroid is a member of the Haumea family, which consists of fragments from a previous collision on the dwarf planet Haumea .

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 . The apparent magnitude of 2008 AP 129 is 20.79  m .

Since it can be assumed that 2008 AP 129 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 believes that it is in 2008 AP 129 to possibly is a dwarf planet.

On the basis of light curve observations, the 2008 AP 129 rotates once around its axis in 9 hours and 2.4 minutes. It follows that in a 2008 AP 129 year it performs 260451.6 self- rotations (“days”).

Provisions of the diameter for 2008 AP 129
year Dimensions km source
2016 482.53 LightCurve DataBase
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 315 530 . SwRI (Space Science Department). Retrieved February 20, 2019.
  2. ↑ a b c (315530) 2008 AP129 at the IAU Minor Planet Center (English) Retrieved on February 20, 2019.
  3. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  4. ↑ a b A. Thirouin et al. a .: Rotational Properties of the Haumea Family Members and Candidates: Short-term Variability (PDF) . In: The Astronomical Journal . 151, No. 6, March 14, 2016, p. 148, 20. arxiv : 1603.04406 . bibcode : 2016AJ .... 151..148T . doi : 10.3847 / 0004-6256 / 151/6/148 .
  5. ↑ a b LCDB Data for (315530) . MinorPlanetInfo. June 2016. Retrieved February 20, 2019.
  6. ↑ MPC : MPEC 2009-U113: 2008 AP129 . IAU . October 27, 2009. Retrieved February 20, 2019.
  7. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved February 20, 2019.
  8. ↑ (315530) 2008 AP129 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 20, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  9. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved February 20, 2019.
  10. ↑ (315530) 2008 AP129 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 February 20, 2019.
  12. ^ Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved February 20, 2019.