Solaris
Solaris is an orange star, cooler than the Sun, in the constellation Pegasus.
How far
160 light years
The light you see from Solaris tonight set off about 160 years ago. Everything we know about it is that much out of date.
How bright
0.25 of a Sun
It gives out 25 per cent of the Sun's visible light. It is too faint to see without a telescope.
Astronomers put its brightness in our sky at magnitude 9.78. Smaller numbers are brighter, and the faintest stars the eye can see are about 6.
How hot
About 3,600 K
That is the temperature of its surface, worked out from its colour, so it is a guide and not a measurement. It could be out by a few hundred degrees. The Sun's is 5,772 K. Hotter stars are bluer and cooler stars are redder, the same way a poker in a fire goes from red to white.
SolarisThe Sun
Its names
- Its own name
- Solaris
- Hipparcos catalogue
- HIP 104780
- Spectral type
- K5
Where this comes from
Distance, brightness, colour and spectral type are from the HYG star database, version 4.4, by David Nash, shared under a Creative Commons Attribution-ShareAlike 4.0 licence. Its distances are those measured by the Hipparcos satellite. The temperature is worked out here from the colour with the formula of Ballesteros (2012), and the words are written for this site.
To read more: Colour and brightness, How stars live and die, Measuring distance.