Sirius A is a 240 million year old star, that is 8.6 light years away from our planet, Earth.


Sirius A, also known as Alpha Canis Major, or the Dog Star, is the brightest star in the Earth's night sky. This main sequence white star has a luminosity of 25x the sun. It has a radius of 740,000 miles, a mass of 2.02x the sun, and a diameter of approximately 1.5 million miles (2.4 million km) - 171% x Sun. Its surface is 10,000 k , and in the center, it can get up to 20 million.

Most people in the Northern Hemisphere notice Sirius in the southeast to southwest on evenings from winter to mid-spring, the best time being February evenings. People also spot Sirius in the east before dawn on summer mornings. Whenever you see Sirius, you can recognize it because it is our sky’s brightest star. Sirius may be called a rainbow star, because it often flickers with many colors. The brightness, twinkling and color changes sometimes are reported as a UFO.

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2 years ago

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