Sirius
Videos
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.
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.
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
Procyon
Videos
Procyon is the brightest star in the constellation of Canis Minor and usually the eighth-brightest star in the night sky, with an apparent visual magnitude of 0.34. It has the Bayer designation α Cani
Orbit of Procyon B seen from above its plane