Eta Coronae Borealis (HD 137108)
Eta Coronae Borealis (HD 137108) is a yellow star, much like the Sun in temperature, in the constellation Corona Borealis. It is in the long, steady part of its life, making helium from hydrogen in its core, as the Sun is.
How far
61 light years
The light you see from Eta Coronae Borealis (HD 137108) tonight set off about 61 years ago. Everything we know about it is that much out of date.
How bright
About one Sun
It gives out about as much visible light as the Sun. It can just be seen by eye from a really dark place.
Astronomers put its brightness in our sky at magnitude 5.96. Smaller numbers are brighter, and the faintest stars the eye can see are about 6.
How hot
Not known here. The catalogue this site uses has no colour measurement for this star, and colour is what the temperature is worked out from. Its spectral type says it is a yellow star, much like the Sun in temperature.
In your sky now
Working it out…
Its names
It has no name of its own. Its name by constellation is a Greek letter and the constellation it is in, a way of naming begun by Johann Bayer in 1603.
- By constellation (Bayer)
- Eta Coronae Borealis
- Henry Draper catalogue
- HD 137108
- Spectral type
- G2 V
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 words are written for this site.
To read more: Colour and brightness, How stars live and die, Measuring distance.