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 52356HIP 55067HIP 55231HIP 52479HIP 52481HIP 52484HIP 55245HIP 55246HIP 55250HIP 55254HIP 55260HIP 52513HIP 52514HIP 55262HIP 55263HIP 55277HIP 55285HIP 55288HIP 52519HIP 52525HIP 52528HIP 52532HIP 55404HIP 55408HIP 55416HIP 52683HIP 52718HIP 55423HIP 55424HIP 55426HIP 55427HIP 55428HIP 55429HIP 55432HIP 55435HIP 55438HIP 55440HIP 55442HIP 55443HIP 55455HIP 55460HIP 55461HIP 55463HIP 55467HIP 52744HIP 52746HIP 52747HIP 52765

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.