Star profile

Diadem

Alpha Comae Berenices · Coma Berenices

3D likeness based on its real data · class F · ~6,500 K

What is Diadem

Diadem shines in Coma Berenices, the head of hair that the Egyptian queen Berenice offered to Aphrodite and that the astronomer Conon of Samos placed into the sky as a constellation. It is a yellow-white F-type star about 58 light-years away — one of the rare constellations whose mythological origin is actually historical rather than legendary, since Berenice II lived in the third century BCE.

Where it is and when to see it

Diadem lies in the northern celestial hemisphere. It is visible to the naked eye under a dark sky. Its best month of the year is March, when it culminates around midnight.

From London it culminates about 56° above the horizon.
From New York it culminates about 67° above the horizon.
From Sydney it culminates about 39° above the horizon.

It can be seen from anywhere north of 72° S.

It ranks no. 2 in brightness among the 39 stars of Coma Berenices in our catalogue. To find it, start from Beta Comae Berenices, the brightest: it lies about 10° away (a fist at arm's length covers about 10°).

The light you see today left it about 58 years ago.

Find it on the sky map

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Leave your signature on Diadem

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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 Diadem

Constellation: Coma Berenices
Apparent magnitude: 4.32
Distance: 58.1 light years
Coordinates (J2000): RA 197.497° · Dec 17.529°
Catalogue: HIP 64241 · HD 114378

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

Other stars in Coma Berenices

Coma Berenices has 39 stars in Stelvia's catalogue. Here are a few of them.

See all 39 stars in Coma Berenices