En grön nomad över jätteteleskopen
Den kanske inte är lika känd som Halleys komet, men en komet är det i alla fall! 252P/LINEAR bjöd på en fin syn i slutet av mars 2016 då den passerade närmare jorden än nästan någon annan känd komet tidigare har gjort. Avståndet var då 5,3 miljoner kilometer, jämfört med 87 miljoner kilometer för Halley 1986.
Kometen 252P/LINEAR har inte någon svans utan ter som som en grönaktig diffus fläck. Färgen orsakas av diatomärt kol som fluorescerar av solstrålningen. På denna bild från april 2016 ses kometens gröna sken nästan mitt i bild, mellan Vintergatsbandet och den vänstra kupolen till ett av huvudteleskopen i ESO:s Very Large Telescope (VLT).
VLT är beläget på Paranalobservatoriet i Chile, en idealisk plats för kometobservationer. Paranal är ett av de mest spektakulära observatorierna i världen, belägen i den vidsträckta Atacamaöknen under mörka himlar på den södra stjärnhimlen.
Kometen är inte det enda intressanta objektet i bilden: Vintergatans stjärnrika interstellära moln smyckas av individuella, mer närbelägna stjärnor, det mångfärgade ljuset av airglow ses nära horisonten, och högt i bild finns två ljusa planeter. I detta svepande panorama bildar de en triangel högst upp i bilden, tillsammans med den röda superjättestjärnan Antares – den intensivt röda Mars och den något svagare röda Antares på samma höjd, och den vitare och något svagare gasjätten Saturnus strax nedanför.
Länkar
Källa:ESO/P. Horálek
Om bilden
| ID: | potw2107a |
| Språk: | sv |
| Typ: | Foto |
| Publiceringsdatum: | 15 februari 2021 06:00 |
| Storlek: | 23840 x 8200 px |
| Field of View: | 360° x 123.8° |
Om objektet
| Namn: | Very Large Telescope |
| Typ: | Unspecified : Technology : Observatory |
Bildformat
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