It is the largest, most brilliant star in our hemisphere and it is known as the blue-white star.Sirius A is 8.7 light years from Earth and moving on a direct course toward our solar system.It is located in the jaws of the Great Dog, Canis Major constellation – hence it is known as the Dog Star. It is visible in the Northern hemisphere of our evening sky from November – April; it can be located by following a direct line through the belt of Orion towards the horizon.
It is called a white dwarf star, with the equivalent mass of our sun packed into a globe four times the size of our Earth.
The name “Sirius” is derived from the Ancient Greek Seirios (“glowing” or “scorcher”). The star has the Bayer designation Alpha Canis Majoris. What the naked eye perceives as a single star is actually a binary star system, consisting of a white main sequence star of spectral type A1V, termed Sirius A, and a faint white dwarf companion of spectral type DA2, termed Sirius B. The distance separating Sirius A from its companion varies between 8.1 and 31.5 AU.
Sirius appears bright because of both its intrinsic luminosity and its proximity to Earth. At a distance of 2.6 parsecs (the Sirius system is one of Earth’s near neighbors. Sirius A is about twice as massive as the Sun and has an absolute visual magnitude of 1.42. It is 25 times more luminous than the Sun but has a significantly lower luminosity than other bright stars such as Canopus or Rigel.
The two stars, Sirius A and Sirius B move around each other, constantly exchanging particles. Because of its greater density and magnetic field, Sirius B takes the lion’s share, taking gases and materials off of its larger host body. Sirius B has a super-heavy gravitationally powerful star made of concentrated super-dense matter (essence) with the number 50 associated with it (describing its orbital period).
Every 49.9 years, Sirius A and B, come as close together as their orbits allow, creating huge magnetic storms between them. As they approach each other, the stars both begin to spin faster as tidal forces become stronger, finally flip-flopping over, actually trading places with each other. This energy is eventually released to flow on magnetic field lines to the Sun, which transmits it like a lens to all the planets.
It should be noted that Sirius B was only “discovered” in 1862 and only analysed in 2005. However, the Dogon are a West African tribe who have known about, and worshipped, Sirius A and its twin the invisible star Sirius B, for the past 5,000 years. (They have also been aware of the planets which circle the sun in elliptical orbits, the four moons of Jupiter and the rings of Saturn.) They said that Sirius B is immensely heavy, invisible, very small, yet extremely powerful. Their understanding of the two stars’ orbits coincides exactly with modern astronomical findings, yet was arrived at thousands of years before it was scientifically proven!
The Dogon not only knew about Sirius B over 5,000 years ago!! but they also described a third – Sirius C…..They named it Enome Ya.
Does Sirius C exist?
The Sirius Star System – Space.com : http://www.space.com/21702-sirius-brightest-star.html
Is Sirius a triple Star System – Harvard ADS : http://adsabs.harvard.edu/full/1995A%26A…299..621B
Thanks to Space.com, Harvard, Hubble Telescope & Bibliotec
- It travels in an eliptical orbit around Sirius A, which it completes in a 50 year cycle.