Leo

Leo, the Lion, is one of the oldest recognized constellations. Its brightest star, Regulus, sits almost exactly on the ecliptic. The constellation's distinctive sickle or backwards question mark asterism represents the lion's head and mane. Leo contains many bright galaxies, including the Leo Triplet (M65, M66, and NGC 3628).

The Zodiac family comprises the 12 constellations that lie along the ecliptic — the apparent path of the Sun across the sky over the course of a year. These are among the oldest recognized constellations, with origins in Babylonian astronomy dating back over 3,000 years. The ecliptic crosses each zodiac constellation at different widths, meaning the Sun spends varying amounts of time in each — from about 7 days in Scorpius to 45 days in Virgo.

Mythology & History

The zodiac constellations carry some of the richest mythological traditions in astronomy. Aries recalls the golden ram whose fleece was sought by Jason and the Argonauts. Gemini represents the twins Castor and Pollux, one mortal and one divine. Leo honors the Nemean Lion slain by Heracles as his first labor. The Babylonians originally used these constellations for agricultural timing, and their astrological associations developed later through Greek and Roman traditions. The modern astronomical boundaries were standardized by the IAU in 1930.

Observation Tips

Zodiac constellations are visible from both hemispheres since they straddle the celestial equator. Each is best observed when it reaches opposition (opposite the Sun in the sky), which occurs roughly six months from the dates when the Sun is in that constellation. The zodiac contains many spectacular deep sky objects: the Orion-adjacent Taurus hosts the Pleiades (M45) and Crab Nebula (M1), Virgo is home to the Virgo Cluster of galaxies, and Sagittarius points toward our galaxy's center with its dense Milky Way star clouds.

HIP 56282HIP 56008HIP 56302HIP 56307HIP 56295HIP 53273HIP 56385HIP 56421HIP 56546HIP 56638HIP 56704HIP 56742HIP 56882HIP 57099HIP 57134HIP 57159HIP 56015HIP 57249HIP 57310HIP 57386HIP 57420HIP 57506HIP 57539HIP 57540HIP 57606HIP 57663HIP 56046HIP 57721HIP 57882HIP 57941HIP 57949HIP 57951HIP 57952HIP 57958HIP 57969HIP 53337HIP 58008HIP 58010HIP 58012HIP 58016HIP 58006HIP 58034HIP 58036HIP 58056HIP 58067HIP 58070HIP 58071HIP 58073

Frequently Asked Questions

What is the Leo constellation?
Leo (Leo) is one of the 88 IAU-recognized constellations in the Northern hemisphere. Leo, the Lion, is one of the oldest recognized constellations. Its brightest star, Regulus, sits almost exactly on the ecliptic. The constellation's distinctive sickle or backwards question mark aster
How many stars are cataloged in Leo?
StarFYI currently catalogs 2,165 stars in the constellation Leo.
What is the brightest star in Leo?
The brightest star in Leo is Regulus.
How large is the Leo constellation?
Leo covers 946.96 square degrees of the sky.
What family does Leo belong to?
Leo belongs to the Zodiac Family of constellations.