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 46447HIP 46449HIP 46764HIP 47022HIP 47148HIP 47384HIP 49758HIP 49842HIP 49895HIP 49965HIP 49993HIP 50056HIP 50174HIP 47518HIP 47636HIP 47887HIP 50744HIP 50812HIP 50814HIP 50819HIP 47896HIP 47939HIP 47976HIP 47978HIP 47979HIP 50823HIP 50826HIP 50829HIP 47987HIP 47991HIP 47994HIP 47995HIP 48006HIP 50845HIP 50848HIP 50853HIP 50856HIP 48014HIP 48020HIP 48021HIP 48023HIP 48024HIP 48033HIP 50878HIP 50882HIP 50884HIP 48048HIP 48049

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.