Lehdistötiedotteet

4. joulukuuta 1990: The Council of the European Southern Observatory, in session today at the ESO Headquarters in Garching near Munich, unanimously decided that the world's largest optical telescope, the 16-metre equivalent Very Large Telescope, shall be placed on Cerro Paranal [1], an isolated mountain top at 2664 m altitude in the central part of Chile's Atacama desert, some 130 kilometres south of the town of Antofagasta and 12 kilometres from the Pacific coast.

9. marraskuuta 1990: A very large, white spot has recently appeared on the giant planet Saturn [1]. It is probably a great storm in the planet's atmosphere, which has been initiated by upwelling of clouds from the lower layers into the uppermost regions. The spot began as a small, white feature in Saturn's northern hemisphere and has since developed rapidly so that it now appears to completely encircle the planet's equatorial regions. "Great White Spots" have been seen on Saturn in 1876, 1903, 1933 and 1960 (see below), but the present one seems to be the biggest of them all.

31. lokakuuta 1990: Observing with the ESO New Technology Telescope, three European astronomers have discovered two previously unknown celestial objects which are seen in the direction of the mysterious centre of our galaxy, the Milky Way. One of the new objects has a comparatively blue colour and appears to be the actual Galactic Centre, at a distance of about 28 000 light-years. It has required a telescope with the penetrating power of the NTT to see through the dense, interstellar dust clouds (which effectively hide the central area from our view) in order to obtain the first optical image of the Galactic Centre.

24. lokakuuta 1990: Astronomers working at the ESO La Silla observatory have just discovered the most distant "normal" galaxy known so far. It has been given the designation G 0102 - 190 and its distance is so great that the light we observe from it was emitted when the Universe was only one third as old as now [1].

29. syyskuuta 1990: By decree of the International Astronomical Union, a newly discovered minor planet (asteroid) in the solar system has been given the name Portugal, honouring this European country.

27. syyskuuta 1990: A long-term astronomical study of spiral galaxies, initiated almost a decade ago at the European Southern Observatory, has recently produced intriguing results about the presence of cold matter in the Universe. They have a direct bearing on the so-called "missing mass" problem, one of the major unsolved riddles in astronomy.

25. syyskuuta 1990: These impressive photos of Comet Levy (1990c), one of the brightest comets in recent years, were obtained with the ESO 1-metre Schmidt telescope at the ESO La Silla Observatory, on September 12 and 14, 1990. On these dates, the comet was 104 and 111 million kilometres from the Earth and 179 and 176 million kilometres from the Sun, respectively. It will reach its perihelion (the point in the orbit which is closest to the Sun) on October 24.

26. heinäkuuta 1990: Famous Comet Halley, now receding from the Sun after its perihelion passage in early 1986, has recently entered into a state of hibernation which will last until shortly before the next passage in 2062.

13. kesäkuuta 1990: Most of the dust that is ejected from a comet's nucleus (i.e. the "dirty snowball" at its centre) assembles in a thin “sheet'' near the orbital plane in which the comet moves around the sun. This sheet is very thin and is difficult to observe unless it is viewed directly from the side. On June 6, 1990, the Earth crossed the orbital plane of Comet Austin, allowing such a unique, side-on view.

23. toukokuuta 1990: With the help of "adaptive optics," a revolutionary optical concept (eso8908), infrared astronomical images have been obtained with the ESO 3.6 m telescope at the La Silla observatory which are as sharp as they would be if the telescope were situated in space. This is the first time in astronomy that a ground-based telescope of this size has been able to directly register during long time periods stellar images with a sharpness that corresponds to the theoretically possible limit.

9. huhtikuuta 1990: Paris, Brussels, Vienna and Copenhagen were some of the stations for ESO's travelling astronomy exhibition. Now this exhibition can be seen for the first time in Switzerland, where CERN's MICROCOSM exhibition has opened its doors for a detailed view at the World of stars and galaxies.

2. maaliskuuta 1990: Professional and amateur astronomers all over the world are excited about the prospects of seeing a really bright comet during the coming months. A newly discovered comet, known by the name of the amateur who first saw it, is now getting brighter each day. Observations are made almost every night at the ESO La Silla Observatory and elsewhere in order to follow the development of the comet and also to try to predict the maximum brightness which the comet will reach by mid-April this year.

6. helmikuuta 1990: In the presence of a distinguished audience of ministers and high-ranking officials, as well as representatives of European industry and scientists from the member states, the European Southern Observatory today officially inaugurates its revolutionary 3.5-metre New Technology Telescope (NTT).

26. tammikuuta 1990: The California Institute of Technology (Caltech) of Pasadena, California, U.S.A. and the European Southern Observatory have concluded an agreement by which ESO will undertake the responsibility of producing high-quality copies of photographic sky survey plates obtained with the Palomar 40-inch Oschin Telescope and to distribute the resulting photographic atlas [1].

5. tammikuuta 1990: Is there - or is there not - a pulsar in Supernova 1987A? This is one of the main enigmas in current astrophysical research, and nearly three years after the explosion of the first naked-eye supernova (see eso8704, eso8705, eso8706, eso8711 and eso8802) in four hundred years, the answer is still not known.

26. lokakuuta 1989: An old dream of ground-based astronomers has finally come true, thanks to the joint development of a revolutionary new technique, adaptive optics, by ESO and ONERA [1], LdM [2] and Observatoire de Paris in France.

25. heinäkuuta 1989: The European Southern Observatory and R.E.O.S.C. Optique (Recherches et études d'optique et de sciences connexes), located at Ballainvilliers near Paris, France, have reached agreement on a contract for the polishing of four giant mirror blanks for the ESO Very Large Telescope (VLT) (see eso8717 and eso8808).

6. heinäkuuta 1989: Recent studies at the European Southern Observatory indicate that the formation of a new star is a dramatic process which may be more complex than most astronomers believed only a few years ago.

30. toukokuuta 1989: On May 11, 1989, Richard M. West at the ESO Headquarters in Garching, Fed.Rep.Germany, found a new comet in a photographic plate obtained on March 14 by night assistant Guido Pizarro with the 1-m Schmidt at the ESO La Silla Observatory. The blue-sensitive plate was exposed during 60 minutes and was centered in the southern constellation of Libra.

11. toukokuuta 1989: "First Light" with the ESO New Technology Telescope (NTT) was obtained on March 23, 1989 (eso8903) during conditions of exceptionally good "seeing'' and the first images are probably the sharpest ever obtained with a large, ground-based telescope. A full account of the associated events will appear in the June 1989 issue of the ESO Messenger.