(469421) 2001 XD 255

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Asteroid
(469421) 2001 XD 255
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type Plutino ,
"Distant Object"
Major semi-axis 39.288  AU
eccentricity 0.112
Perihelion - aphelion 34.894 AU - 43.682 AU
Inclination of the orbit plane 18.1 °
Length of the ascending node 106.7 °
Argument of the periapsis 111.9 °
Time of passage of the perihelion November 5, 2070
Sidereal period 246 a 3.1 M
Mean orbital velocity 4.713 km / s
Physical Properties
Medium diameter approx. 315 km
Albedo 0.08-0.09
Absolute brightness 5.6 - 5.9 mag
history
Explorer Scott S. Sheppard
David C. Jewitt
Jan T. Kleyna
Date of discovery December 9, 2001
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.

(469421) 2001 XD 255 is a large trans-Neptunian object in the Kuiper belt , which is classified as Plutino in terms of orbital dynamics . Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2001 XD 255 was discovered on December 9, 2001 by a team of astronomers consisting of Scott Sheppard , Dave Jewitt and Jan Kleyna , using the 3.6 m CFHT telescope at the Mauna Kea Observatory ( Hawaii ). The discovery was announced on January 17, 2002 together with the TNO 2001 XB 255 and 2001 XC 255 , the planetoid was later given the minor planet number 469421 by the IAU .

The observation arc of the asteroid begins with the official discovery observation on December 9, 2001. Since then, the asteroid has been observed through various earth-based telescopes. In April 2017, a total of 126 observations were made over a period of 14 years. The last observation so far was carried out in March 2015 at the Pan-STARRS telescope (PS1) ( Maui ). (As of March 26, 2019)

properties

Orbit

2001 XD 255 orbits the sun in 246.26 years on a slightly elliptical orbit between 34.89  AU and 43.68 AU from its center. The orbit eccentricity is 0.112, the orbit is 18.14 ° inclined to the ecliptic . Currently, the planetoid is 38.65 AU from the sun. He will next pass through perihelion in 2070, so the last perihelion should have occurred in 1824.

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 315 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.9  m . Based on this diameter, the total area is about 312,000 km². The apparent magnitude of 2001 XD 255 is 21.78  m .

Since it is conceivable that 2001 XD 255 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 believes that it is in 2001 XD 255 to perhaps is a dwarf planet.

Determination of the diameter for 2001 XD 255
year Dimensions km source
2018 336.0 Johnston
2018 315.0 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 469421 . SwRI (Space Science Department). Retrieved March 26, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 26, 2019.
  3. ↑ a b c (469421) 2001 XD255 at the IAU Minor Planet Center (English) Retrieved March 26, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2002-B07: 2001 XB255, 2001 XC255, 2001 XD255 . IAU . January 17, 2002. Retrieved March 26, 2019.
  6. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 26, 2019.
  7. ↑ (469421) 2001 XD255 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 26, 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. Accessed March 26, 2019.
  9. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 26, 2019.
  10. ↑ (469421) 2001 XD255 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 March 26, 2019.