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Lee Harvey Osmond at the Interstellar Rodeo in Edmonton, Alberta, Canada. ©Eric Kozakiewicz/Interstellar Rodeo
Con l'amico Pippo, in un perfetto (e freddo) pomeriggio a rincorrere il sole che lascia la Val Belluna.
Discovered 2017
Many lovers of the starry sky and deep space dream of one day discovering something that others have never seen before. It is in the nature of every human being and it is quite normal. If we pay attention to the solar system, except for the discovery of some new small planetary satellites (eg Jupiter's moons) - "everything is probably found" in the solar system. But, the question of objects that do not belong to our solar system, and which appear in it - is an extremely exciting idea. One such object was discovered only in 2017. Oumuamua is the first interstellar object discovered in our solar system. I said "only in 2017", because according to Oumuamu's calculations, it entered our solar system in 1837. That is a long time ago. The object is certainly old.
What is Oumuamua
Many may now ask - how was Oumuamua not discovered earlier? Far from the Sun, this object did not give enough light to be seen even with the best telescopes. Oumuamua was moving at 70,000 miles per hour and it was not easy to "observe". When it approached the Sun, this object remained for a very short time in a small area where it was registered by telescopes. After the object passed by the Sun - the reflected Oumuamua light began to dim rapidly. The Hubble Telescope last observed the Oumuamua object in January 2018. When an object reaches magnitude 25 - for all of us, it has disappeared from the sky.
Various theories
It entered the solar system in 1837 at a distance of 1000 AU, and at lastronomy.com/best-price-telescopes/oumuamua-interstella...
Joe Nolan at the Interstellar Rodeo in Edmonton, Alberta, Canada. ©Eric Kozakiewicz/Interstellar Rodeo
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They say the flap of a butterfly's wings can set off a tornado on the other side of the world. But what happens when a butterfly flaps its wings in the depths of space? This cosmic butterfly is a nebula known as AFGL 4104, or Roberts 22. Caused by a star that is nearing the end of its life and has shrugged off its outer layers, the nebula emerges as a cosmic chrysalis to produce this striking sight. Studies of the lobes of Roberts 22 have shown an amazingly complex structure, with countless intersecting loops and filaments. A butterfly's life span is counted in weeks; although on a much longer timescale, this stage of life for Roberts 22 is also transient. It is currently a preplanetary nebula, a short-lived phase that begins once a dying star has pushed much of the material in its outer layers into space, and ends once this stellar remnant becomes hot enough to ionise the surrounding gas clouds and make them glow. About 400 years ago, the star at the centre of Roberts 22 shed its outer shells, which raced outwards to form this butterfly. The central star will soon be hot enough to ionise the surrounding gas, and it will evolve into a fully fledged planetary nebula. Information about the nature, age, and structure of Roberts 22 was presented in a paper using Hubble data back in 1999, published in The Astronomical Journal.
Joe Nolan at the Interstellar Rodeo in Edmonton, Alberta, Canada. ©Eric Kozakiewicz/Interstellar Rodeo