(136199) Éris I Dysnomie
See also: Dysnomie (homonymy)
Dysnomie (officially indicated like (136199) Eris I Dysnomia , that is to say (136199) Éris I Dysnomie in French) is a Natural satellite of the Objet transneptunien (136199) Éris, the only known one at present (at the end of 2005).
Discovered
Dysnomia was discovered in September 2005 by the telescope Keck II. Its discovery was announced in October 2005.The object accepted its official name in September 2006, of the name of a Greek goddess girl of the goddess Éris; it had before been called “Gabrielle” by its discoverers, of the name of the partner of Xena (nickname given at the time with (136199) Éris).
Characteristics
Dysnomy is approximately 60 times less luminous than Éris, which makes it possible to estimate its diameter at 350 km, the eighth of the object around of which it orbits.Its orbit is estimated at 30.000 km, for one 14 days period.
Consequences
With the discovery of Dysnomie, it from now on is established that three of the four larger objects of the Ceinture of Kuiper have a sizeable satellite of size (it is the case of Éris, and Pluton; only does not seem to have some).A contrario , only 10% of the least luminous objects of the belt of Kuiper has a satellite. This could induce that the collisions between the objects of more than 1.000 km in diameter were relatively current in the past, the impacts projecting an significant amount of materials which would have been incorporated out of satellites.
The discovery of this satellite should make it possible to the scientists to determine the mass of Éris.
See too
Internal bonds
External bonds
- '' Discovery off Gabrielle '', Keck Observatory
- '' 2003 UB313, the 10th planet, has moon! '' (page of Michael E. Brown on the discovery of Dysnomie)
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