SkyRef / Stars

Algieba

γ¹ Leo. Magnitude 2.61, orange-red. Comfortably visible to the naked eye from a suburban sky.

The numbers

Designationγ¹ Leo
Magnitude2.61
Colourorange-red
Right ascension10.333h
Declination+19.84°
B−V index1.15
CatalogueHR 4057

What you are looking at

Astronomers call it γ¹ Leo — the Bayer designation, which reads as a Greek letter ranking its brightness within its constellation. Algieba is the name people actually use.

Algieba shines at magnitude 2.61, making it comfortably visible to the naked eye from a suburban sky. Its B−V colour index of 1.15 makes it orange-red to the eye, corresponding to a surface temperature of under 4,000 K.

It sits at right ascension 10.33 hours and declination +19.8°. It straddles the celestial equator, so it is visible from essentially anywhere on Earth at the right time of year.

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