Star profile

Mu Coronae Borealis

Cool red star

3D likeness based on its real data · class M · ~3,200 K

What is Mu Coronae Borealis

Mu Coronae Borealis is a vast red giant, sixty-seven times the Sun's radius, set upon the delicate arc of the Northern Crown. Its surface hovers around just 3,200 K —cool by stellar standards— yet pours out nearly a thousand times the Sun's light. A deep ember, barely visible from truly dark skies.

Where it is and when to see it

Mu Coronae Borealis lies in the northern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is April: the Sun sits at the opposite point of the sky and the star culminates around midnight. How high it climbs above the horizon depends on the latitude you watch from.

Find it on the sky map

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The signature wall

Stelvia's sky works like a signature wall: anyone can leave their name and a message on a real star, and that signature goes up on the map for everyone to read. Signing is free.

A signature without a lock can be replaced by someone else's. The lock makes the signature permanent and lets you choose a symbolic name for the star, always shown next to the star's catalogue identifier. How the lock works

If you don't have an account yet, we'll ask for an email to confirm it's you: we send you a link and that's it, no password.

Write my signature

A public signature from a real person. The chosen name is a symbolic denomination within Stelvia, with no official standing or IAU recognition: the sky is not for sale and belongs to no one.

Astronomical data for Mu Coronae Borealis

Constellation: Corona Borealis
Apparent magnitude: 5.14
Distance: 619.0 light years
Coordinates (J2000): RA 233.812° · Dec 39.010°
Catalogue: HIP 76307 · HD 139153

A symbolic commemorative gift: neither the signature nor the chosen name implies ownership of the star or recognition by the IAU.

Other stars in Corona Borealis

Corona Borealis has 26 stars in Stelvia's catalogue. Here are a few of them.

See all 26 stars in Corona Borealis