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The Southern Cross points out the South Celestial Pole, around which the sky appears to rotate

Beautiful Night in the Atacama Desert

vidéo
Créé pour l'OAE

Légende : Honorable mention in the 2023 IAU OAE Astrophotography Contest, category of Time-lapses of rotation of Big Dipper or Southern Cross. Taken from San Pedro de Atacama, Chile, in June 2023, this time-lapse reveals the celestial ballet that unfolds as the Southern Cross takes its majestic journey across the sky, pointing the way to the South Celestial Pole around which the sky rotates, until it gracefully sets. The star-studded canvas showcases the grandeur of the Milky Way, adorned by the rotating Large and Small Magellanic Clouds swirling around the Southern Celestial Pole. The prominent constellations of Crux, Centaurus, Scorpius, and the former Argo Navis (Carina, Puppis, Vela) are also visible. The spectacle begins just after nightfall, capturing the radiant descent of Canopus, a beacon about to dip below the horizon. Throughout the sequence, there is a subtle presence of passing aeroplanes, fleeting headlights of cars, drifting clouds, and the ethereal airglow. At a stunning moment, a vivid meteor streaked across the sky, a breathtaking fireball briefly igniting the right lower corner around the 41st second mark. As the sequence progresses, the rising moon elegantly illuminates the landscape, casting its glow upon an ancient tree trunk resting on the dry, dusty grounds of the Salar de Atacama. This captivating journey through the night skies concludes before the break of dawn, offering a glimpse into the celestial marvels that are woven into the nocturnal tapestry of San Pedro de Atacama.
Crédit : Uwe Reichert/IAU OAE (CC BY 4.0)

Termes du glossaire: Pôle céleste , Sphère Céleste , La rotation de la Terre , Croix du Sud
Catégories : Astronomie à l'œil nu
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 ( vidéo 221.01 MB)

Timelapses of rotating skies behind trees, telescopes, mountains and observatories

The Rotating Planet

vidéo
Créé pour l'OAE

Légende : Second place winner in the 2023 IAU OAE Astrophotography Contest, category of Time-lapses of rotation of Big Dipper or Southern Cross. A cosmic journey unfolds across continents in this time-lapse video which captures both iconic constellations from diverse corners of the world. Starting in China, the Big Dipper graces the night sky, a steadfast guide embedded in cultural narratives. Its luminance marks the beginning of this celestial odyssey. The two pointer stars on the end of the Big Dipper point to the North Star (Polaris) which appears to remain stationary as the sky rotates. From Nepal’s lofty peaks, the Big Dipper’s familiarity persists, a reliable fixture in the shifting panorama of the rotating planet. Moving to Chile, the Southern Cross adorns the firmament, emblematic of the southern skies. Frames from Chile showcase this constellation accompanied by the Milky Way Galaxy. In Namibia, a telescope from the H.E.S.S. Observatory appears in the video. Later, nestled beneath sheltering trees, the Big Dipper persists in its celestial prominence, appearing against a canvas of stars. Using varied techniques — fisheye lenses, static cameras, and Earth's movement-tracking — each frame unveils the Cross’s grandeur against diverse landscapes. These sequences — marked by star trails and Earth’s rotation—highlight the enduring presence of the Big Dipper and Southern Cross, bridging cultures and celestial beauty across hemispheres.
Crédit : Jianfeng Dai/IAU OAE (CC BY 4.0)

Termes du glossaire: Grande Ourse , Pôle céleste , Sphère Céleste , La rotation de la Terre , Pôle céleste nord (PCN) , Polaris , Croix du Sud , Pôle céleste sud (PCS)
Catégories : Astronomie à l'œil nu
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 ( vidéo 863.53 MB)

The Milky Way appears as a diagonal stripe bottom left to top right. It becomes more horizontal as the video progresses.

Southern Sky Over La Silla

vidéo
Créé pour l'OAE

Légende : First place winner in the 2023 IAU OAE Astrophotography Contest, category of Time-lapses of rotation of Big Dipper or Southern Cross. This video shows the Milky Way’s sprawling brilliance across the celestial expanse. Among the stars’ grand theatre, the Southern Cross constellation claims its place in the scene, distinguished by its distinctive cross shape as seen in the top of this video and slightly to the right just over the Milky Way, slowly disappearing as the video progresses. This celestial marker, a prominent feature in the southern hemisphere, holds cultural and navigational significance, having served as a navigational guidepost for centuries. Accompanying the Milky Way’s grandeur are the two Magellanic clouds, celestial companions seen dancing in the distant sky. The Carina Nebula adds its ethereal glow to the cosmic panorama, painting a radiant hue against the darkness. In the midst of this celestial ballet, a gentle green hue envelops the atmosphere, a phenomenon known as airglow, adding a touch of subtle luminescence to the night sky. The terrestrial also makes an appearance, with planes flying overhead and vehicles driving between observatory buildings. This time-lapse, taken from the La Silla Observatory in Chile, is a window to the captivating dance of stars, offering a glimpse into the awe-inspiring beauty of our galaxy and the celestial landmarks that grace the southern sky.
Crédit : José Rodrigues/IAU OAE (CC BY 4.0)

Termes du glossaire: Pôle céleste , Sphère Céleste , La rotation de la Terre , Observation , Ciel , Croix du Sud
Catégories : Astronomie à l'œil nu
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 ( vidéo 1.07 GB)

The Milky Way over a cloudy landscape. A triangle of bright objects is visible on the left of the image.

Equatorial Milky Way

image
Créé pour l'OAE

Légende : Honourable mention in the 2022 IAU OAE Astrophotography Contest, category Still images of celestial patterns: Equatorial Milky Way   Taken in Bromo-Tengger-Semeru National Park, Java Island, Indonesia, in March 2016, this image captures regions of the southern Milky Way and, at its left edge, the two planets Mars and Saturn. Mars appears orange and is similar in colour to the star Antares, whose Greek name — anti Ares — references this. Saturn is a little bit fainter than Mars, but clearly visible among the stars of Ophiuchus, above the Pipe Nebula and forming an isosceles triangle with Mars and Antares. Mars is on the top and Saturn is vertically below. Visible to the naked eye, both planets have significance in many cultures around the world. In Roman mythology Mars is the god of war and fertility, and Saturn the god of sowing and agriculture. Its Greek equivalent, the god Kronos, is also considered the regent of completion. Indigenous Australians, including the Kamilaroi and Wailan people, associate Saturn with “wunygal”, a small bird. Mars is called Iherm-penh (something burnt in flames) by the Anmatyerre people of the Central Desert, while the Kokatha people of the Western Desert associate Mars and the star Anatres with the red-tailed black cockatoo (Kogolongo). In the middle of this photograph, the most famous southern constellations are clearly recognisable: the Southern Cross (Crux), the pointer stars, Alpha and Beta Centauri, the dark Coalsack Nebula and the red Eta Carina Nebula, which is not visible to the unaided eye but is prominent in modern photographs. In the 19th century, the star eta Carinae had been the second-brightest star in the sky for some time, but since it varies irregularly, it has hardly been recognisable in recent decades, and its future visibility is unpredictable. Triangulum Australe is visible between the pointer stars and the Scorpion, and in the constellation of Centaurus, the bright globular star cluster Omega Centauri is clearly displayed. It was considered a “nebulous star” since antiquity and, thus, was listed in star catalogues for at least 2000 years. Only within the last century did astronomers discover that globular star clusters are in the halo of our galaxy and that this one consists of roughly 10 million stars. The dark regions in the Milky Way, which are cool, dense clouds of dust and gas, form the head and body of the Celestial Emu Tchingal. Together with the Southern Cross and the pointer stars, they appear in the Dreamtime stories of many Indigenous Australians. One story associated with the Djab Wurrung and the Jardwadjali people is part of a Dreamtime Story involving Tchingal, the Bram-bram-bult brothers (the pointer stars), their mother Druk (Delta Crux), and Bunya the hunter, who gets transformed into a possum (Gacrux, the red star at the top of the Southern Cross).
Crédit : Giorgia Hofer/IAU OAE

Termes du glossaire: Poussière , Mars , Voie lactée , Saturne , Scorpius , Croix du Sud , Nuage de poussière , L'extinction interstellaire , Alpha du Centaure
Catégories : 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 1.61 MB)

Traînées d'étoiles brillantes en arc autour du centre de l'image, derrière la silhouette d'un arbre.

Exposition d'une demi-journée de l'étoile polaire, par Fabrizio Melandri, Italie

image
Créé pour l'OAE

Légende : Premier prix du concours d'astrophotographie de l'UAI OAE, catégorie Traînées d'étoiles. Cette image de la traînée d'étoiles montre le mouvement apparent des étoiles dans le ciel nocturne, qui résulte de la rotation de la Terre autour de son axe polaire. Les arbres au premier plan servent de point d'ancrage lorsque nous tournons avec la Terre. Le demi-cercle blanc brillant au centre de l'image est l'étoile polaire nord - Polaris, qui est située très près du Pôle Nord Céleste. On peut imaginer que la Terre est au centre d'une sphère de cristal creuse, et que les étoiles sont incrustées dans cette sphère. À mesure que la Terre tourne sur son axe, un observateur sur Terre voit les étoiles se lever et se coucher, suivant un arc, car l'horizon empêche l'observateur de voir l'arc complet pour les étoiles qui sont plus éloignées du pôle céleste. Le Pôle Céleste Nord (et son opposé le Pôle Céleste Sud) est essentiellement formé en prolongeant la ligne de l'axe de la Terre. Pour capturer cette image, le photographe doit prendre une longue exposition avec l'appareil photo sur un trépied et pointer vers l'étoile polaire (Hémisphère Nord). Dans l'Hémisphère Sud, aucune étoile n'est aussi proche du Pôle Céleste que Polaris. La position du Pôle Céleste Sud est donc déterminée à l'aide de la Croix du Sud et des étoiles pointeurs (Alpha et Beta Centauri). Bien que l'image ait une légère teinte bleue, elle capture les différentes couleurs des étoiles. Il est facile de distinguer les étoiles bleues à haute température des étoiles blanchâtres à plus basse température, et même des étoiles rougeâtres à plus basse température. Cette variation de couleur s'explique par le fait que les étoiles à température élevée émettent davantage dans des longueurs d'onde plus courtes (plus bleues) que les étoiles à température plus basse qui émettent dans des longueurs d'onde plus longues (plus rouges).
Crédit : Fabrizio Melandri/IAU OAE

Termes du glossaire: Étoiles circumpolaires , La piste des étoiles
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

Ce fichier est sur Zenodo ( image 6.11 MB)

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Le Bureau de l'astronomie pour l'éducation est hébergé par la Maison de l'astronomie sur le campus de l'Institut Max Planck d'astronomie à Heidelberg. Le Bureau de l'astronomie pour l'éducation est un bureau de l'Union Astronomique Internationale, avec un financement important des Fondations Klaus Tschira et Carl Zeiss. Les colloques Shaw-IAU sur l'astronomie pour l'éducation sont financés par la Fondation Shaw Prize.