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 50053HIP 50054HIP 50109HIP 50110HIP 50089HIP 50124HIP 50130HIP 50134HIP 50146HIP 50155HIP 50156HIP 50159HIP 50172HIP 50175HIP 50178HIP 50203HIP 50207HIP 50223HIP 50225HIP 50229HIP 50239HIP 50255HIP 50261HIP 50271HIP 50282HIP 50297HIP 50394HIP 53225HIP 53233HIP 53234HIP 53238HIP 53240HIP 53245HIP 53246HIP 50604HIP 50608HIP 50579HIP 50613HIP 50632HIP 50637HIP 50663HIP 50686HIP 50699HIP 50700HIP 50770HIP 50750HIP 50782HIP 50784

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.