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Sirius is a binary star consisting of a main-sequence star of spectral type A0 or A1, termed Sirius A, and a faint white dwarf companion of spectral type DA2, termed Sirius B. The distance between the two varies between 8.2 and 31.5 astronomical units as they orbit every 50 years.
In Greek and Roman mythology and religion, Sirius (/ ˈ s ɪ r ɪ ə s /, SEE-ree-əss; Ancient Greek: Σείριος, romanized: Seírios, lit. 'scorching' pronounced) is the god and personification of the star Sirius, also known as the Dog Star, the brightest star in the night sky and the most prominent star in the constellation of Canis Major (or the Greater Dog). [1]
MV Manifa (formerly MV Sirius Star) is an oil tanker formally owned and operated by Vela International Marine. [3] With a length overall of 330 m (1,080 ft) and a capacity of 2.2 million barrels (350,000 m 3) of crude oil, she is classified as a very large crude carrier or VLCC. [3]
Distances of the nearest stars from 20,000 years ago until 80,000 years in the future Visualisation of the orbit of the Sun (yellow dot and white curve) around the Galactic Centre (GC) in the last galactic year. The red dots correspond to the positions of the stars studied by the European Southern Observatory in a monitoring programme. [71]
Its name comes from the Greek word for "scorching" or "searing". Sirius is also a binary star; its companion Sirius B is a white dwarf with a magnitude of 8.4–10,000 times fainter than Sirius A to observers on Earth. [32] The two orbit each other every 50 years. Their closest approach last occurred in 1993 and they will be at their greatest ...
An artist's impression of Sirius A and Sirius B, a binary star system. Sirius A, an A-type main-sequence star, is the larger of the two. An A-type main-sequence star (A V) or A dwarf star is a main-sequence (hydrogen burning) star of spectral type A and luminosity class V (five). These stars have spectra defined by strong hydrogen Balmer ...
The well-known binary star Sirius, seen here in a Hubble photograph from 2005, with Sirius A in the center, and white dwarf, Sirius B, to the left bottom from it. A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other.
Relative to both luminosity and distance from Earth, a star's absolute magnitude (M) and apparent magnitude (m) are not equivalent; [184] for example, the bright star Sirius has an apparent magnitude of −1.44, but it has an absolute magnitude of +1.41. The Sun has an apparent magnitude of −26.7, but its absolute magnitude is only +4.83.