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eso9940 — Organisaatiotiedote
The VLT Writes Its Name
13. elokuuta 1999: A computer-controlled "Active Optics" system was first developed at ESO in the 1980's. It allows the continuous tuning of the optical system of an astronomical telescope, thus ensuring that it always produces the sharpest possible images of astronomical objects. The first major telescope to profit from this revolution in telescope techniques was the ESO New Technology Telescope (NTT) at the La Silla observatory. Since it began operation in 1990, 75 adjustable supports below the 3.58-m primary mirror, coupled with advanced image analysis and control software, have made this prototype telescope one of the best in the world. Each of the four ESO Very Large Telescope (VLT) Unit Telescopes is equipped with the latest, improved active optics system that controls the primary 8.2-m Zerodur mirror as well as the secondary 1.1-m lightweight beryllium mirror at the top of the telescope structure. This system offers complete control of the optical quality, allowing the VLT to take full advantage of the exceptional atmospheric conditions at Paranal. This is amply confirmed by fine quality of the astronomical observations now performed with the first Unit Telescope, ANTU. In the course of the one-year commissioning period (May 1998 - March 1999), ESO's opticians performed extensive tests and further improvements of the active optics system at ANTU. Here are some interesting examples that illustrate the amazing versatility of this front-line technological system.
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eso9932 — Valokuvan julkistus
Scouting for ROSETTA
29. kesäkuuta 1999: The launch in early 2003 of the Rosetta spacecraft of the European Space Agency (ESA), the 3rd "Cornerstone" mission of this organisation, will mark the beginning of an exciting scientific endeavour. Following two close passages by the Earth and another by Mars to gain speed, the complex 1.3-tonnes spacecraft will continue towards a rendez-vous with the icy nucleus of Comet Wirtanen [2], passing two asteroids on the way. Beginning in late 2011, at a time when the comet is close to its aphelion - the most distant point in its elongated orbit, about 770 million km from the Sun - the Rosetta "orbiter" will literally chase Comet Wirtanen for two years, sending back valuable data about the nucleus and its immediate environment. A "lander" will attach itself to this lump of frozen ice and dust, which is travelling through space at over 46,000 kilometres per hour, and analyse samples. A joint team from ESO and ESA's Space Science Department has proposed a short series of ground-based exploratory observations in support of this European space mission. Responding to the challenge, the second 8.2-m VLT telescope (KUEYEN), while undergoing commissioning at Paranal, has just performed a remarkable feat by observing the nucleus of Comet Wirtanen, now near its aphelion, i.e. at the location of the future Rosetta encounter. This is equivalent to viewing a pitch-black golfball, over 20,000 kilometres away!
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