Distance from Earth:

8.6 light years

Star name, type:

Sirius A, white main sequence star A0V

Star mass, radii:

2.10, 1.68 x Sol

Star2 name, type:

Sirius B, white dwarf DA2-5

Star2 mass, radii:

1.03, 0.08 x Sol

Binary separation:

8.1 - 31.5 AU


The brightest star in winter sky (north. hemisphere)

Hypothetical planet location:

2 AU

Possible life:

less than 5%


Image description:

Our hypothetical planet is located at 2 AU. The main problem comes from the invisible part of light, called ultra-violet which is very strong for this type of stars (spectral type A).


Also, strong stellar winds could damage the atmosphere and make UV rays even more powerful in their destruction. Maybe some bacteria could live below planet's surface. Even if life starts below the surface, the star will become red giant in next 1 billion years, which is not enough for life to develop.


This is the main reason why O, B and A spectral type stars are excluded from the "search for life". On this picture, we see the dawn at Sirius system. Haze is due to the dust particles of this dead and burnt world.


Because of Sirius B, we couldn't move our hypothetical planet at 3 or 4 AU (better location) since Sirius B would disrupt this planet's orbit and kick it out of the system.