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By Lupu Victor Astronomy
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Sirius the brightest star in the sky Video through telescope

Monday, April 16, 2012 8:42
% of readers think this story is Fact. Add your two cents. Sirius is the brightest star in the sky. Has an apparent magnitude of -1.46 visually, and is almost two times brighter than Canopus, the second in brightness. Sirius is part of Big Dog constellation, is from 8.60 ± 0.04 light years from us, and has a rotation of 16 km / s

The name “Siriusis derived from ancient Greek Seirios (brightness”). What our eye perceives as a single star is actually a binary star: Sirius A and Sirius B A1V (A) / DA2 (B). These two stars are visible in the video below. Distance that separates the two stars, varies between 8.1 and 31.5 AU.
Sirius appears brighter, because its proximity to Earth. Sirius binary system is one of Earth’s closest neighbors. Sirius A is about twice as massive as the Sun and has an absolute visual magnitude of 1.42. Is 25 times brighter than the Sun, but has a lower luminosity than other bright stars such as Canopus or Rigel.

The system is old, between 200 and 300 million years. It was originally composed of two bright bluish stars. Sirius B, consumed its resources, and has become a red giant and threw up its outer layers becoming a white dwarf around 120 million years ago.

Sirius can be seen from almost every inhabited region of the Earth’s surface. The best time of year to see itis around 1 January.

The two stars, Sirius A and Sirius B, revolve around each other are constantly exchanging particles between them. Due to higher density and magnetic field, Sirius B takes the lion’s part, taking gases and materials from her host star.

Every 49.9 years, Sirius A and B, come as close together as their orbits allow, and creating huge magnetic storms between them. The more closer to each other, the more they begin to rotate faster around each other, and eventually change places.

Video: Victor Lupu
Optical Telescope Celestron C8 Newtonian, super plossl 20mm, 2x Barlow
Mount: CG5 (EQ5)
Camera: Sony CX130
Video mode: 1920×1080 progressive
Filter: no
Date: 27/02/2012
Location: Baia Mare, Romania
Processing and Editing - Sony Vegas 10



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