(78799) 2002 XW 93
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Asteroid (78799) 2002 XW 93 |
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|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type |
Centaur or "Distant Object" |
| Major semi-axis | 37.36 AU |
| eccentricity | 0.253 |
| Perihelion - aphelion | 27,909 AU - 46,812 AU |
| Inclination of the orbit plane | 14.4 ° |
| Length of the ascending node | 46.9 ° |
| Argument of the periapsis | 247.2 ° |
| Time of passage of the perihelion | February 6, 1927 |
| Sidereal period | 228 a 4.3 M |
| Physical Properties | |
| Medium diameter | |
| Albedo | |
| Absolute brightness | 5.5 mag |
| history | |
| Explorer | Palomar observatory |
| Date of discovery | December 10, 2002 |
| 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. | |
(78799) 2002 XW 93 is a large trans-Neptunian object , which is classified as a centaur or more generally as a "distant object" . Because of its size, the asteroid is a dwarf planet candidate .
discovery
2002 XW 93 was on 10 December 2002 by a team of astronomers at Palomar Observatory ( California discovered). The discovery was announced on January 5, 2003, along with 2002 XV 93 and (119979) 2002 WC 19 . The IAU gave the planetoid the minor planet number 78799 .
After its discovery, in 2002 XW 93 could be identified in photos taken as part of the Digitized Sky Survey at the Palomar Observatory on December 17, 1989, and so its observation period was extended by 13 years in order to calculate its orbit more precisely. In April 2017, a total of 29 observations over a period of 19 years were available. The last observation so far was made in September 2008 with the Hubble Space Telescope .
properties
Orbit
2002 XW 93 orbits the sun in 228.36 years in a strongly elliptical orbit between 27.91 AU and 46.81 AU from its center. The orbit eccentricity is 0.253, the orbit is 14.38 ° inclined to the ecliptic . The planetoid is currently 45.69 AU from the sun and 44.96 from the earth (as of February 1, 2019). The last time he passed through perihelion was in 1927, so the next perihelion should take place around the year 2155.
Marc Buie ( DES ) classifies him as a centaur , the Minor Planet Center as a "Distant Object" . The Johnston's Archives lists it as "other TNO" , which means it is definitely not a Cubewano or Resonantes KBO ; however, it is close to 5: 7 resonance with the planet Neptune .
size
A diameter of around 565 km is currently assumed, based on a reflectivity of 3.8% and an absolute brightness of 5.5 m . The apparent magnitude of 2002 XW 93 is 21.99 m .
Since it can be assumed that 2002 XW 93 is in hydrostatic equilibrium due to its size and therefore must be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown assumes that the 2002 XW 93 is likely a dwarf planet.
| year | Dimensions km | source |
|---|---|---|
| 2012 | 565.0 +71.0−73.0 | Vilenius et al. a. |
| 2018 | 584.0 | Brown |
| The most precise determination is marked in bold . | ||
See also
- List of asteroids
- List of trans-Neptunian objects
- List of dwarf planets of the solar system
- 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 78799 . SwRI (Space Science Department). Retrieved February 1, 2019.
- ↑ a b c (78799) 2002 XW93 at the IAU Minor Planet Center (English)
- ↑ MPC : MPEC 2003-A25: 2002 WC19, 2002 XV93, 2002 XW93 . IAU . January 5, 2003. Retrieved February 1, 2019.
- ↑ (78799) 2002 XW93 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 1, 2019.
- ^ Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved February 1, 2019.
- ↑ (78799) 2002 XW93 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 February 1, 2019.
- ↑ E. Vilenius et al. a .: "TNOs are Cool": A survey of the trans-Neptunian region VI. Herschel / PACS observations and thermal modeling of 19 classical Kuiper belt objects . In: Astronomy and Astrophysics . April 3, 2012. arxiv : 1204.0697 . doi : 10.1051 / 0004-6361 / 201118743 .