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Winter Milky Way
image
Créé pour l'OAE
Légende : Winner in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns.
Taken near Lake Misurina in the Veneto region of Italy in February 2019, this image shows a clear and starry sky over a winter landscape.
We can see part of the Milky Way arc. From the left side, towards the south-east, we see Sirius, "The Burner" in Greek, the brightest star in the night sky. It is part of the constellation Canis Major, The Great Dog, one of the dogs of Orion, the great hunter, in Greek mythology. Orion’s other dog, Canis Minor, the Small Dog, is represented by the bright star Procyon and its fainter neighbours. The Greek star name means “The One [rising] before The Dog” and the star is seen at the top left side of the image just above the arc of the Galaxy. Orion lies to the right of Canis Major. We can spot its characteristic “belt”, an asterism composed of three bright stars aligned in a straight line.
Above the treetops to the right of Orion, the open star clusters of the Hyades and the Pleiades in the constellation Taurus, the Bull, are visible. According to ancient lore, these two clusters form a Celestial Gate directly next to the intersection of the great circles of the ecliptic and the Milky Way. In Greco-Roman mythology, Taurus is associated with the god Zeus who is said to have used a bull to seduce the Phoenician princess Europa.
Above the constellation Taurus, we can see a bright star just above the arc of the Galaxy. This is Capella, the brightest star of the constellation Auriga, The Charioteer. This is one of the 88 modern constellations and is associated with the Greek hero Erichthonius of Athens. Hindu astronomy considers Capella as the heart of Brahma, one of the three major gods. The indigenous people of Bororo in Brazil have a constellation representing a cayman, comprising some of the stars of Auriga and some stars from neighbouring constellations.
To the right of Taurus, we find the modern constellation Perseus with the bright double star cluster h+chi Perseii, which represents the metal of Perseus’s sabre in Greek mythology. Perseus is the hero who was sent out to prove himself, and happened to rescue Andromeda from the sea monster Cetus as the Roman poet Ovid wrote. We can also see the constellation Cassiopeia, associated with the queen and mother of Andromeda in Greek mythology. It is composed of five bright stars in the shape of a W, which was considered the asterism of The Key by the Greeks according to the poet Aratus. The recognisable shape is also associated with other mythologies: for instance, it represents the princess Sharmishtha in Hindu astronomy, a bat in Thailand, and a camel in native Arabic astronomy.
In the gap between the trees, the Andromeda Galaxy is visible.
Crédit : Giorgia Hofer/IAU OAE
Termes du glossaire:
Galaxie d'Andromède , Voie lactée , Taureau , Pléiades
Catégories :
Galaxies
, Voie lactée et milieu interstellaire
, 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
Ce fichier est sur Zenodo ( image 1.18 MB)
Étoile filante des Géminides
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Créé pour l'OAE
Légende : Photographié avec un smartphone le 13 décembre 2022, un météore des Géminides a illuminé le ciel au-dessus de la Vallée de la Lune Bleue, Yunnan, en Chine, offrant un spectacle à couper le souffle sur fond de sérénité de la Montagne des Neiges du Dragon de Jade. Réputées pour leur luminosité éblouissante et leurs teintes vives, les Géminides font partie des pluies de météores les plus vibrantes provenant de l'astéroïde 3200 Phaethon. Chaque année, lorsque notre planète traverse la traînée de débris de Phaethon, des fragments de poussière et de roche se vaporisent dans l'atmosphère, créant le phénomène stupéfiant de la pluie de météores des Géminides. Sur cette superbe image du ciel nocturne, les étoiles jumelles des Gémeaux (Castor et Pollux) sont masquées par la silhouette des arbres à gauche. Dans les eaux calmes se reflètent les étoiles de la constellation d'Orion, que l'on voit s'élever vers le centre inférieur de l'image, tandis que Mars, radieuse, conserve son éclat en tant que premier phare céleste de la scène, avant que le lever de la lune ne prenne le relais.
Crédit : Jianfeng Dai/IAU OAE (CC BY 4.0)
Termes du glossaire:
Gémeaux , Étoile filante
Catégories :
Astronomie à l'œil nu
, Système solaire
Mots clés :
astrophotography
Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes
Ce fichier est sur Zenodo ( image 15.06 MB)
The Horsehead Nebula
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Légende : This image shows the Horsehead Nebula, located at a distance of about 1,300 light-years from Earth in the Orion constellation, one of the most iconic examples of a dark nebula. A dark nebula is a dense cloud of interstellar dust and cold gas that absorbs and scatters visible light, preventing background stars and glowing gas from reaching our eyes. This false-color image combines data captured through multiple narrowband filters, each isolating light from different elements in the nebula. The dark, horse-shaped silhouette appears sharply outlined against the luminous nebula behind it, where energetic radiation from nearby young stars causes the gas to glow. The uneven distribution of visible stars in this image is not random: regions rich in dust in the lower part of this image appear almost empty, while clearer areas reveal many background stars. The dust acts like a cosmic curtain, hiding stars that lie behind it while allowing stars in front of the cloud to remain visible. Studying such regions helps astronomers understand how nebulae serve as environments where new stars can form.
Crédit : T.A.Rector (NOIRLab/NSF/AURA) and Hubble Heritage Team (STScI/AURA/NASA)
Lien du crédit
Termes du glossaire:
Nébuleuse sombre , Poussière , Nébuleuse , L'espace
Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes
Fichier
( image
23.89 MB)
The red supergiant Betelgeuse
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Légende : The image shows Betelgeuse, a red supergiant in the constellation Orion, observed by the Atacama Large Millimeter/submillimeter Array (ALMA). ALMA consists of many antennae spread across a plain in Northern Chile. The observations from all of these receivers is synthesised together by a central computer to form an image. The wide distances between the antennae mean that is can resolve very fine details.
Most stars we observe are just seen as points of light, but Betelgeuse is so large (with a radius about 1,400 times larger than the Sun) and is sufficiently nearby that it is one of the few stars to have been resolved to show it as an extended object.
Betelgeuse is a massive star, more than 14 times the mass of the Sun and is relatively young for a star (less than 14 million years old). However, its high mass led to it having a very hot core which burned through its hydrogen fuel quickly. It has since evolved through many stages and now appears as a red supergiant, it's final stage before exploding as a supernova. When such an explosion will happen is not known for certain, but it could be in around 100,000 years. Such an explosion would be visible from Earth, even during the day.
Crédit : ALMA (ESO/NAOJ/NRAO)/E. O’Gorman/P. Kervella
Lien du crédit
Termes du glossaire:
Étoile géante , Géante rouge , Supergéante rouge , Étoile supergéante , Étoile de type M
Catégories :
Étoiles
Licence : Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Creative Commons (CC) Attribution 4.0 International (CC BY 4.0) Icônes
Fichier
( image
4.86 MB)
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