Star profile

Delta Boötis

3D likeness based on its real data · class G · ~5,500 K

What is Delta Boötis

Delta Boötis, called Princeps in old charts, is a yellow giant eleven times the Sun's radius that has exhausted the hydrogen at its core. Beside it, separated by some 3,800 astronomical units, glows a faint magnitude-7.8 companion visible through binoculars: a shared journey in slow motion at 122 light-years, where a single orbit could span a hundred thousand human years.

Where it is and when to see it

Delta Boötis 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 Delta Boötis

Constellation: Boötes
Apparent magnitude: 3.46
Distance: 121.8 light years
Coordinates (J2000): RA 228.876° · Dec 33.315°
Catalogue: HIP 74666 · HD 135722

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

Other stars in Boötes

Boötes has 88 stars in Stelvia's catalogue. Here are a few of them.

See all 88 stars in Boötes