(136108) 2003 EL₆₁ , also indicated by 2003 EL₆₁ , is an object of the Ceinture of Kuiper. He was discovered in 2005 by the team of J.L. Ortiz of the institute of astrophysics of Andalusia to the Observatoire of the Sierra Nevada in Spain and 2004 by that of Mike Brown of the Caltech in the United States. MPC credits the discovery with the team with Ortiz, which was the first to announce the object.

Surface

According to the observations of sound spectrum, the surface of is mainly made up of Glace of Eau ^, , at the same time in amorphous form Cristal line and . The water ice would form between the two-thirds and the three-quarters of surface, the composition of the remainder not being known. Water ice was detected on others transneptuniens, but typically in its amorphous form. The crystalline ice is unstable on several million years under the conditions of the belt of Kuiper; its discovery suggests the existence of a process réalimentant surface in new ice periodically.

The Albédo of 2003 EL₆₁ is apparently comparable with that of the Neige.

Internal composition

The Density of 2003 EL₆₁ is evaluated between: 2.6 and 3.3 G Cm3, starting from constraints on its size and its number of revolutions (the denser the object is, the less it is oblong) ^, .

This family, the first identified among the transneptuniens objects, includes EL₆₁ and her satellites, and. The dispersion of the orbital elements of the members is of some pourcents or less (5% for the Equatorial radius: 1.4° for the Slope and: 0.08 for the eccentricity).

The common physical characteristics include neutral colors and zones of infra-red absorbtion typical of the water ice.

The training of such a family by impact requires a progenitor approximately 1660 km in diameter, with a density of approximately 2.0 G cm -3, similar to Pluton or Éris. During this collision, EL₆₁ would have lost approximately 20% of its mass, mainly of the ice, and would have become denser. Its surface would be mainly covered with ice.

S/2005 (136108) 2, the smallest, discovered on June 30th, 2005 consequently team, orbit 39300 away km in 34 days, on a tilted orbit of 40° compared to that of S/2005 (136108) 1. Its mass would reach 0,2% of that of 2003 EL₆₁ and its ray approximately 170 km, by supposing a similar albedo. By typing this code in an search engine, it was possible to find the data of observation of Brown, including the positions observed of the object. The history of connections showed that the page in question had been reached by an address IP used by the computer of the institute of astrophysics of Andalusia, where the team of Ortiz worked. The team of Brown showed that of Ortiz to have seriously enfreint scientific ethics and asked the MPC to withdraw the credit of the discovery to them. Thereafter, Ortiz admitted to have reached the data in question one day before announcing the discovery, but denied any embezzlement. According to him, it differently did not use any of these data than to check, by pure curiosity, if the object which its team had found were the same one. They had realized that the object mentioned in the summary of Brown seemed to have similar characteristics; by typing abstract designation in Google, it led on the data of the telescope. The ambiguity of the discovery rises owing to the fact that the team of Brown to Caltech had not submitted her discovery to the MPC more than one year after having detected it. The protocol in progress wants that the first nobody who submits a report/ratio to the MPC with sufficient data to allow a correct orbital determination is credited with the discovery. It is what the team of Ortiz did, using their images of 2003, of those of 2005 and their research in former files. The Minor Planet Center quotes Ortiz and Al like the formal discoverers of the object.

July 29th, 2005, shortly after the advertisement of Ortiz, Brown announced the discovery of another object, Éris, which is more distant and larger than Pluton. This advertisement was carried out in an anticipated way, at the request of the Minor Planet Center , to prevent a similar escape.

See too

Internal bonds

• Belt of Kuiper
• Object transneptunien
• Plutino

External bonds

References

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