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Légende du diagramme : The constellation Lyra with its bright stars and surrounding constellations. Lyra is surrounded by (going clockwise from the top): Draco, Hercules, Vulpecula and Cygnus. Lyra is dominated by its brightest star Vega which is used to define the zero point of one of the most commonly used magnitude scales of stellar brightness. Vega forms one vertex of the prominent Summer Triangle asterism that is visible in northern hemisphere summer evenings.

Lyra is a northern constellation and thus is visible at some point in the year throughout the northern hemisphere. The whole constellation is also visible from all equatorial and some temperate regions of the southern hemisphere. Parts of the constellation are visible from the remaining southern temperate areas. Lyra is best viewed in the evenings in the northern hemisphere summer and southern hemisphere winter.

The famous planetary nebula M57, commonly known as the Ring Nebula, lies in Lyra. It is marked here with a green circle superimposed on a plus sign. The globular cluster M56 also lies in Lyra and is marked here with a yellow circle with a plus sign superimposed on it.

The y-axis of this diagram is in degrees of declination with north as up and the x-axis is in hours of right ascension with east to the left. The sizes of the stars marked here relate to the star's apparent magnitude, a measure of its apparent brightness. The larger dots represent brighter stars. The Greek letters mark the brightest stars in the constellation. These are ranked by brightness with the brightest star being labeled alpha, the second brightest beta, etc., although this ordering is not always followed exactly. The dotted boundary lines mark the IAU's boundaries of the constellations and the solid green lines mark one of the common forms used to represent the figures of the constellations. Neither the constellation boundaries, nor the lines joining the stars appear on the sky.

Crédit du diagramme : Adapted by the IAU Office of Astronomy for Education from the original by the IAU and Sky & Telescope. Lien du crédit

État de la traduction du diagramme: Pas encore approuvé par un·e relecteur(rice)
Licence du diagramme : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes

Termes du glossaire en rapport : Amas globulaire , Ascension droite (AD) , Astérisme , Constellation , Coordonnées célestes , Déclinaison , Magnitude apparente , Nébuleuse planétaire
Catégories : Astronomie à l'œil nu

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