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In the case of the Sothic cycle the two cycles are the Egyptian civil year and the Sothic year. The Sothic year is the length of time for the star Sirius to visually return to the same position in relation to the sun. Star years measured in this way vary due to axial precession, [9] the movement of the Earth's axis in relation to the sun.
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.
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Representative lifetimes of stars as a function of their masses The change in size with time of a Sun-like star Artist's depiction of the life cycle of a Sun-like star, starting as a main-sequence star at lower left then expanding through the subgiant and giant phases, until its outer envelope is expelled to form a planetary nebula at upper right Chart of stellar evolution
a fish with a star. This is the original symbol from the brief period when this asteroid was known and astronomers were still using iconic symbols. [60] [88] U+1F77A (dec 128890) a lyre. This symbol only appears in later 19th-century reference works that appeared when iconic symbols for asteroids had already become obsolete. [45] 12 ...
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Sirius is the fixed star with the greatest apparent magnitude and one which is almost non-variable. The Pleiades , a key feature of Taurus shown across Orion in the same photograph also experience an annual period of visibility ("rising and setting").
For stars with similar metallicity to the Sun, the theoretical minimum mass the star can have, and still undergo fusion at the core, is estimated to be about 75 M J. [13] [14] When the metallicity is very low, however, a recent study of the faintest stars found that the minimum star size seems to be about 8.3% of the solar mass, or about 87 M J.