Carte de la constellation du Capricorne

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Légende : La constellation du Capricorne (communément appelée Capricorne) inclut ses étoiles brillantes et les constellations environnantes. Le Capricorne est entouré (dans le sens des aiguilles d'une montre à partir du haut) du Verseau, de l'Aigle, du Sagittaire, de Microscope et du Poisson Austral. Le Capricorne se trouve sur l'écliptique (représenté ici par une ligne bleue), c'est-à-dire la trajectoire que le Soleil semble suivre dans le ciel au cours d'une année. Le Soleil se trouve dans le Capricorne de la mi-janvier à la mi-février. Les autres planètes du système solaire se trouvent souvent dans le Capricorne. Le Capricorne se trouve juste au sud de l'équateur céleste et est visible pour tous les observateurs situés au sud du cercle polaire arctique. Le Capricorne est surtout visible le soir, en automne dans l'hémisphère nord et au printemps dans l'hémisphère sud. Au sud-est (en bas à gauche sur ce diagramme) de la constellation se trouve l'amas globulaire M30 (représenté ici par un cercle jaune sur lequel est superposé un signe plus). L'axe des y de ce diagramme est en degrés de déclinaison avec le nord en haut et l'axe des x est en heures d'ascension droite avec l'est à gauche. La taille des étoiles marquées ici correspond à la magnitude apparente de l'étoile, une mesure de sa luminosité apparente. Les points les plus gros représentent les étoiles les plus brillantes. Les lettres grecques indiquent les étoiles les plus brillantes de la constellation. Elles sont classées par ordre de luminosité, l'étoile la plus brillante étant étiquetée alpha, la deuxième plus brillante bêta, etc., bien que cet ordre ne soit pas toujours respecté à la lettre. Les lignes pointillées marquent les limites des constellations selon l'UAI et les lignes vertes pleines marquent l'une des formes couramment utilisées pour représenter les figures des constellations. Ni les limites des constellations, ni les lignes reliant les étoiles n'apparaissent sur le ciel.
Crédit : Adapté par le Bureau de l'astronomie pour l'éducation de l'AIU à partir de l'original de l'AIU/Sky & Telescope
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Termes du glossaire: Magnitude apparente , Capricorne , Coordonnées célestes , Constellation , Déclinaison , Ecliptique , Amas globulaire , Ascension droite (AD) , Zodiaque , Verseau , Sagittaire , Tropique du Capricorne
Catégories : Astronomie à l'œil nu

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Corvus Constellation Map

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Légende : The constellation Corvus with its bright stars and surrounding constellations. Corvus is surrounded by (going clockwise from the top): Virgo, Crater and Hydra. Corvus is a southern constellation and thus the whole of the constellation is visible in the southern hemisphere at some point in the year. The whole constellation is also visible from temperate and equatorial regions of the northern hemisphere. Corvus is best viewed in the evenings in the northern hemisphere late spring and southern hemisphere late autumn. 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. The blue line at the top left marks the ecliptic. Neither the constellation boundaries, nor the line marking the ecliptic, nor the lines joining the stars appear on the sky.
Crédit : Adapted by the IAU Office of Astronomy for Education from the original by the IAU and Sky & Telescope
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Termes du glossaire: Magnitude apparente , Coordonnées célestes , Constellation , Déclinaison , Ecliptique , Ascension droite (AD)
Catégories : Astronomie à l'œil nu

Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes

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Canis Minor Constellation Map

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Légende : The constellation Canis Minor with its bright stars and surrounding constellations. Canis Minor is surrounded by (going clockwise from the top): Gemini, Monoceros, Hydra and Cancer. Canis Minor has relatively few bright stars but its brightest star Procyon is the eight brightest star in the sky. Canis Minor spans the celestial equator and thus part of the constellation is visible from the whole Earth at some point during the year. The whole constellation is visible to all but the most arctic and antarctic regions. 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. The blue line in the top right of the diagram marks the ecliptic. Neither the constellation boundaries, nor the line marking the ecliptic, nor the lines joining the stars appear on the sky.
Crédit : Adapted by the IAU Office of Astronomy for Education from the original by the IAU and Sky & Telescope
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Termes du glossaire: Magnitude apparente , Coordonnées célestes , Équateur céleste , Constellation , Déclinaison , Ecliptique , Ascension droite (AD)
Catégories : Astronomie à l'œil nu

Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes

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Gemini Constellation Map

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Légende : The zodiac constellation Gemini and its surrounding constellations. Starting from the top of the diagram and going clockwise, these are Auriga, Taurus, Lynx, Orion, Monoceros, Canis Minor and Cancer. The brightest stars in Gemini, Castor and Pollux appear in the upper lefthand corner (north-east) of the diagram. In Greek mythology, the stars in this constellation are thought to resemble twins with their arms wrapped around each other, with Castor and Pollux indicating their heads. Gemini lies on the ecliptic (shown here as a blue line), this is the path the Sun appears to take across the sky over the course of a year. The Sun is in Gemini from late June to late July. The other planets of the Solar System can often be found in Gemini. Gemini lies north of the celestial equator and is visible in all but the antarctic regions of the world. Gemini is most visible in the evenings in the northern hemisphere winter and southern hemisphere summer. Just to the right of the foot of the Castor twin is an open cluster of stars (labelled as a yellow circle with a dotted line border), Messier 35, also known as the Shoe-Buckle Cluster. This cluster is spread out over an area roughly the size of the full moon. In addition to this cluster of stars, there is a planetary nebula (labelled as a green circle with four radial spikes) – NGC 2392 – near the celestial equator and just to the left of the Pollux twin. Two variable stars (Mekbuda and Propus; labelled as two concentric circles) can be found in the “legs” of each twin, but are so faint that an observer would need dark skies to see them. 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 labelled 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 line marking the ecliptic, nor the lines joining the stars appear on the sky.
Crédit : Adapted by the IAU Office of Astronomy for Education from the original by IAU/Sky & Telescope
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Termes du glossaire: Magnitude apparente , Coordonnées célestes , Constellation , Déclinaison , Ecliptique , Gémeaux , Ascension droite (AD) , Taureau , Zodiaque
Catégories : Astronomie à l'œil nu

Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes

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Cetus Constellation Map

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Légende : The constellation Cetus along with its bright stars and surrounding constellations. Cetus is surrounded by (going clockwise from the top): Pisces, Aquarius, Sculptor, Fornax, Eridanus, Taurus and Aries. Cetus lies just south of the ecliptic (shown here as a blue line), this is the path the Sun appears to take across the sky over the course of a year. While the Sun does not pass through Cetus, the other planets of the solar system and the Moon can sometimes be found in Cetus. The star Omicron Ceti or Mira is a famous variable star. This red giant varies in brightness by a factor of 600 over the course of its eleven month period. Cetus spans the celestial equator, thus some part of the constellation is visible from all the the Earth at some point in the year. The full constellation is visible from equatorial and temperate regions of both hemispheres. Cetus is most visible in the evenings in the northern hemisphere late autumn and the southern hemisphere late spring. The barred spiral galaxy M77 lies in Cetus as does the spiral galaxy NGC 247 and the dwarf irregular galaxy IC 1613. All three are marked here with red ellipses. 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. Mira is marked with an open circle as it is a variable star not always visible to the naked eye. 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 line marking the ecliptic, nor the lines joining the stars appear on the sky.
Crédit : Adapted by the IAU Office of Astronomy for Education from the original by IAU/Sky & Telescope
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Termes du glossaire: Magnitude apparente , Coordonnées célestes , Constellation , Déclinaison , Ecliptique , Ascension droite (AD) , Zodiaque , Étoile variable
Catégories : Astronomie à l'œil nu

Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes

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