File:R Doradus starmap.svg
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[edit]DescriptionR Doradus starmap.svg |
English: R Doradus is the star of greatest telescopic width (has the highest "angular dimension") as viewed from earth, other than the Sun. It is a red giant, angularly close to Alpha Reticulum. It reaches (passes through) the present zenith of the sky ("highest" point, point directly above a viewer) at about the 62th parallel south where the only intersecting land is King George Island (or rather, to use celestial terms, is very narrowly more than -62° declination), in the present astronomical epoch. The star can at all times be seen from that hemisphere; in most seasons from the tropics, subject to the sun's outshining it, and it is very limited in duration (yearly and nightly) and in declination above the horizon as to a final observation belt just north of the Tropic of Cancer. Map is useful proving red giants or red stars feature as 5 out of 6 components of narrow kite shape, main asterism, drawn for "Reticulum", and still more than are unusually numerous and intense to the immediate east, including this one, just beyond its official boundaries. The colours (red, yellow, blue) are much intensified away from white, or reddish as they largely appear but can be, by computer, saturation-enhanced using images from telescopes active in preferably arid conditions, due to water vapour's diffractive effects. The map is to be held upwards, with the south horizon/south pole to the front of the viewer. Français : R Doradus, est l'étoile de la plus grande largeur télescopique (a la plus grande «dimension angulaire») vue de la terre, sauf le Soleil. C'est une géante rouge, angulairement proche de l'Alpha Reticulum. Elle atteint (passe à travers) le zénith actuel du ciel (point «le plus élevé», celui directement au-dessus d'un spectateur) à environ le 62e parallèle sud où la seule terre qui se croisent est fr:Île du Roi-George (King George Island) (ou plutôt, en termes célestes, est très de peu supérieure de -62 ° déclinaison), à l'époque astronomique actuelle. Elle se rend à tout moment visible depuis cet hémisphère; dans la plupart des saisons des tropiques, sous réserve que quand il fait jour; et elle est très limitée en durée (annuelle et nocturne) autant qu'en déclinaison (au-dessus de l'horizon) depuis une ceinture d'observation finale juste au nord du tropique du Cancer. La carte est utile, car de nombreuses géantes rouges ou étoiles figurent autour de la forme étroite presque d'un cerf-volant, ainsi que dans l'astérisme principal dessiné pour «Réticule» y comportant 5 des 6 étoiles - qui sont tous particulièrement intenses, vue de la terre, surtout à l'est immédiat de cette forme, y compris cette-étoile ci, juste au-delà de ses limites officielles. Les couleurs (rouge, jaune, bleu) sont beaucoup intensifiées loin du blanc, ou rougeâtre car elles apparaissent largement. Ces-ci peuvent être, par ordinateur, améliorées par saturation à l'aide d'images de télescopes actifs dans des conditions de préférence arides, en raison des effets diffractifs de la vapeur d'eau. La carte doit être tenue vers le haut, avec l'horizon sud / le pôle Sud à l'avant du spectateur. |
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Source | File:R Doradus starmap.png |
Author | User:Tomruen |
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