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Orion (constellation)
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Orion is a prominent set of stars visible during winter in the northern celestial hemisphere. It is one of the 88 modern constellations; it was among the 48 constellations listed by the 2nd-century AD
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Click on to see large image.
The constellation of Orion, as it can be seen by the naked eye. Lines have been drawn.
The constellation of Orion, as it can be seen by the naked eye. Lines have been drawn.
Orion as depicted in Urania's Mirror, a set of star chart cards published in London c. 1825
Orion as depicted in Urania's Mirror, a set of star chart cards published in London c. 1825
This view brings out many fainter features, such as Barnard's Loop.
This view brings out many fainter features, such as Barnard's Loop.
Sirius
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Sirius is the brightest star in the night sky, located in the southern constellation of Canis Major. Its name is derived from the Greek word Σείριος. The star is designated α Canis Majoris, Latinized
Hubble Space Telescope image of Sirius A and Sirius B. The white dwarf can be seen to the lower left. The diffraction spikes and concentric rings are instrumental effects. Sirius B is approximately one thousand times fainter than Sirius A.
Hubble Space Telescope image of Sirius A and Sirius B. The white dwarf can be seen to the lower left. The diffraction spikes and concentric rings are
Sirius (bottom) and the constellation Orion (right). The three brightest stars in this image—Sirius, Betelgeuse (top right) and Procyon (top left)—for
Sirius (bottom) and the constellation Orion (right). The three brightest stars in this image—Sirius, Betelgeuse (top right) and Procyon (top left)—form the Winter Triangle. The bright star at top center is Alhena, which forms a cross-shaped asterism with the Winter Triangle.
The constellations Canis Major (left) and Orion as seen with the naked eye. Sirius, left of centre, is the brightest star.
The constellations Canis Major (left) and Orion as seen with the naked eye. Sirius, left of centre, is the brightest star.
A Chandra X-ray Observatory image of the Sirius star system, where the spike-like pattern is due to the support structure for the transmission grating
A Chandra X-ray Observatory image of the Sirius star system, where the spike-like pattern is due to the support structure for the transmission grating. The brighter source is Sirius B. Credit: NASA/SAO/CXC