(469421) 2001 XD 255
Asteroid (469421) 2001 XD 255 |
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Properties of the orbit ( animation ) | |
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.
year | Dimensions km | source |
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2018 | 336.0 | Johnston |
2018 | 315.0 | 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
- ^ A b Marc W. Buie : Orbit Fit and Astrometric record for 469421 . SwRI (Space Science Department). Retrieved March 26, 2019.
- ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 26, 2019.
- ↑ a b c (469421) 2001 XD255 at the IAU Minor Planet Center (English) Retrieved March 26, 2019.
- ↑ v ≈ π * a / period (1 + sqrt (1-e²))
- ↑ MPC : MPEC 2002-B07: 2001 XB255, 2001 XC255, 2001 XD255 . IAU . January 17, 2002. Retrieved March 26, 2019.
- ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 26, 2019.
- ↑ (469421) 2001 XD255 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 26, 2019.
- ↑ MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Accessed March 26, 2019.
- ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 26, 2019.
- ↑ (469421) 2001 XD255 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
- ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 26, 2019.