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Astronomers: The tenth planet was discovered - apparently larger than Pluto and distant 97

Astronomers: The tenth planet was discovered - apparently larger than Pluto and 97 years distant. Later it was called Xena, and finally its official name was changed to Eris. In this knowledge it is still referred to by its serial number 2003 UB313

Artist image - Aris
Artist image - Aris

Update 08:30 - NASA sent a press release in which the discovery is described as the tenth planet, but for now this designation is enclosed in quotation marks.
"He is without a doubt bigger than Pluto." Dr. Michael Brown from the California Institute of Technology (Caltech) told the NASA website, after the discovery wave of a new planet at the edge of the solar system.
The as-yet-unnamed planet discovered by Brown and his colleagues is now 97 AU away. For comparison, Pluto is 40 AU from the Sun.
The new planet is more or less in the Kuiper Belt, a region beyond Neptune that contains thousands of icy worlds circling the Sun. The planet looks typical of the Kuiper belt self but is much larger than them. Its size approaches that of some of the planets in the solar system, giving it the classification of a planet in its own right, Brown says.
Amateur astronomers with relatively large telescopes can see the new planet but don't expect anything impressive. It appears as a dim patch of light, apparent magnitude 19, moving slowly against the stellar background. "It's almost overhead in the early morning eastern sky in the constellation Cetus," Brown said.
"We are 100 percent certain that this is the first larger-than-Pluto object ever discovered in the outer solar system." Brown added.
The telescopes have not yet been able to detect the disk of the planet to estimate its size. Astronomers must rely on measurements of the planet's brightness. Like all planets, the new candidate also reflects sunlight. The larger the planet, the greater the light reflection. The ratio of the energy reflected back from the surface to the total amount of energy hitting the surface is not yet known, however they were able to place limits on the diameter of the planet.
"Even if it reflects 100 percent of the light that reaches it, it will still be as big as Pluto." Brown said. The diameter of Pluto is about 2,300 km. In my estimation, its diameter is at least one and a half times that of Pluto, but I am not sure." Due to various reasons, Spitzer was unable to observe the object, so it is estimated that its size cannot be more than 3,000 km.
The discoverers have already petitioned the International Astronomical Union to give the planet a permanent name. The union still needs to meet and decide.

The BBC, which we quoted in the news from tonight (see below), upgraded it both in terms of content and in terms of placement - from a secondary position in the science section to the opening news of this section and a prominent news item on the news homepage.
Now the British news website writes more decisively than yesterday: "Scientists in the USA announced that they discovered the tenth planet orbiting the Sun. It is the largest object found in the solar system since the discovery of Neptune in 1845. It was first discovered in 2003 but only recently has it been confirmed as a planet.
The diameter of the planet named 2003 UB313 is 3,000 km (yesterday it was about half, see news below, AB), and it is made of ice and rocks. This size makes it about 20% larger than Pluto.
It is more than twice as far away as Pluto in a strange orbit inclined at an angle to the orbits of the other planets.
Astronomers believe that at some point in the history of the solar system, Neptune guided it into an inclined orbit of 44 degrees. The object is at a distance of 87 astronomical units from the Sun, as mentioned more than twice the average distance of Pluto from the Sun.

Bigger than Pluto
The planet was discovered by Michael Brown of Caltech, Chad Trujillo of the Gemini Observatory in Hawaii and David Rabinovitch of Yale University.
David Rabinovitch told the BBC website: "This is a remarkable day in a remarkable year. 2003 UB313 is almost certainly larger than Pluto, paler than Pluto, but probably 3 times further away.
If it were at Pluto's distance from the sun, it might be brighter. So today the world knows that Pluto is not unique. There are other Plutos, far in the outer region of the solar system, and therefore more difficult to discover.
The object was discovered using the Samuel Oschin telescope at the Plummer Observatory and the Gemini XNUMX-meter telescope on Mauna Kea in Hawaii.
Chad Trujillo said: “I feel very fortunate to be a part of such an exciting discovery. It's not every day you find something the size of Pluto or bigger."
The spectral analysis we took with Gemini is also particularly interesting because it shows that the surface of 2003 UB313 is very similar to that of Pluto.
The object was first discovered on October 21, 2003, but was not seen moving in the sky until it was seen again in the same area 15 months later on January 8, 2005. Researchers say they tried to search for Othello using the heat sensitive Spitzer telescope but did not locate it. This gave them the possibility to predict the upper limit of its diameter - 3,000 kilometers. The lower limit also makes it larger than Pluto.
For the past seven months, scientists have been studying the planet to better estimate its size and motion.
The discovery of 2003 UB313 was followed by the announcement of another discovery 2003 EL61 (Workshop) which appears to be somewhat smaller than Pluto.

Initial version of the news, 29/7/2005 time 22:30

Astronomers have found a large object in the vast expanses of the edge of the solar system. This is considered a great discovery. The data regarding the new bone is still fragmented and partial. It does not come any closer to the Sun than Neptune and spends most of its time far beyond Pluto's orbit.
It is one of the largest objects discovered so far in the outer solar system and is most certainly composed of ice and rocks. Its estimated diameter is at least 1,500 kilometers but it is possible that it is even larger than Pluto which is 2,247 kilometers in diameter. Uncertainties in the estimation of the size may be caused by errors in the measurement of light reflectance. It can be a large and dim body or a small and bright one. Regardless, this is an important discovery. In 2004, scientists discovered Sadna, a distant world 1,700 kilometers in diameter.

Two groups of scientists claim the latest discovery. The object was photographed by astronomers at the Institute of Astrophysics in Andalusia as part of a survey of the outer solar system in search of objects that they have been conducting since 2002. "We found a bright, slow-moving object, after examining older images from our survey of trans-Neptunian objects." said Jose Luis Ortiz (Ortiz), one of the discoverers of the bone. They designated it as the 2003 EL61.
However, American astronomers also claim to have discovered it. The team of scientists who discovered Sadna named the new body K40506A after it was imaged by the Jetzini Telescope and one of the two telescopes at the Keck Observatory in Hawaii. They intend to present their findings at a conference in Cambridge in September.
Because the object is relatively bright, astronomers are carefully checking other observatories that may have caught it, particularly robotic sky surveyors.

For information on the NASA website
For news at the BBC
He knew the edge of the solar system

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