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, when it culminates around midnight.

From London it never sets and culminates about 78° up.
From New York it culminates about 88° above the horizon.
From Sydney it culminates about 17° above the horizon.

It can be seen from anywhere north of 51° S.

It ranks no. 13 in brightness among the 26 stars of Corona Borealis in our catalogue. To find it, start from Alphecca, the brightest: it lies about 12° away (a fist at arm's length covers about 10°).

The light you see today left it about 620 years ago.

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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

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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