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 53318HIP 50522HIP 50524HIP 50528HIP 50535HIP 50539HIP 50542HIP 50543HIP 50547HIP 50549HIP 50557HIP 50560HIP 53338HIP 53342HIP 53362HIP 53366HIP 50582HIP 50611HIP 50623HIP 50729HIP 50737HIP 53413HIP 53414HIP 53430HIP 53431HIP 53486HIP 53496HIP 53505HIP 53532HIP 53585HIP 53596HIP 50950HIP 53666HIP 53727HIP 53765HIP 53857HIP 53887HIP 53947HIP 53959HIP 51058HIP 51085HIP 51119HIP 51147HIP 51179HIP 51201HIP 53984HIP 54055HIP 54089

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.