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.

Aug 1, 2023 · What is Sirius A? Sirius A, also known as the Dog Star, is one of the brightest stars visible in Earth's night sky. It holds the distinction of being the second brightest star overall, situated within the constellation Canis Majoris. The name "Sirius" originates from the Greek word meaning "glowing."

Sirius, brightest star in the night sky, with apparent visual magnitude −1.46. It is a binary star in the constellation Canis Major. The bright component of the binary is a blue-white star 25.4 times as luminous as the Sun.

This Hubble Space Telescope image shows Sirius A, the brightest star in our nighttime sky, along with its faint, tiny stellar companion, Sirius B. Astronomers overexposed the image of Sirius A [at centre] so that the dim Sirius B [tiny dot at lower left] could be seen.

Oct 24, 2023 · Sirius, also known as the Dog Star or Sirius A, is the brightest star in Earth's night sky. The name means "glowing" in Greek — a fitting description, as only a few planets, the full moon and...

Feb 27, 2025 · Sirius, Alpha Canis Majoris (α CMa), is the luminary of the constellation Canis Major (the Great Dog) and the brightest star in the sky. It is also one of the nearest stars to Earth.

Jun 29, 2014 · Sirius, also known as the Dog Star, α Canis Majoris (Alpha Canis Majoris), or Canicula, is the brightest star in the night sky. It lies at a distance of 8.60 light years (2.64 parsecs) from Earth, in the constellation Canis Major, the Greater Dog.

Dec 6, 2019 · Sirius A is a binary star, and it is the brightest star in the night sky located in the Canis Majoris constellation. The name Sirius is derived from the Greek word “Seirios” meaning “glowing” or “scorching.” It has a visual apparent magnitude of -1.46, being twice as bright as Canopus, the second brightest star.

Apr 2, 2025 · Sirius A is a spectroscopic binary star located in the constellation of Canis Major, The Big Dog. It is not part of the Canis Major constellation outline but is within the borders of the constellation.

Sirius (or Sirius A) is a main-sequence star of spectral type early A. Sirius B is one of the largest known white dwarf stars and is 10,000 times dimmer than Sirius. It’s so dim that astronomers couldn’t estimate its mass until 2005 by using data from the Hubble Space Telescope.