What kind of star is Denebola?
Denebola, catalogued as Beta Leonis (β Leo), appears in the official constellation Leo. Its apparent visual magnitude is about 2.14, while its estimated distance is about 36 light-years. Astronomers classify the object as A3 Va main-sequence star with debris disc. These labels describe temperature, luminosity class or system components; they should not be read as a claim that every naked-eye point is a single isolated star.
Beta Leonis is a young A-type main-sequence star that rotates substantially faster than the Sun. Infrared observations detect more emission than the photosphere alone should produce, evidence for a circumstellar debris disc made of dust replenished by collisions among larger bodies. A debris disc is not the same as a directly imaged planet, and current page copy should keep those claims separate. Denebola has also been classified as a low-amplitude variable in some catalogues, though the changes are subtle. Its proximity makes it an important comparison object for understanding how planetary-system debris evolves after the gas-rich protoplanetary stage has ended.
The coordinate pair RA 11h 49m 03.58s, Dec +14° 34′ 19.4″ fixes the object's direction on the celestial sphere for the J2000 reference epoch. Right ascension works like celestial longitude measured in hours, while declination works like latitude north or south of the celestial equator. Proper motion and improved measurements can refine catalogue positions, but these coordinates are sufficiently precise for a finder chart or planetarium search.
Denebola data at a glance
| Proper name | Denebola | Catalogue designation | Beta Leonis (β Leo) |
|---|---|---|---|
| Constellation | Leo | Apparent magnitude | about 2.14 |
| Spectral or system type | A3 Va main-sequence star with debris disc | Estimated distance | about 36 light-years |
| Right ascension (J2000) | 11h 49m 03.58s | Declination (J2000) | +14° 34′ 19.4″ |
Values are rounded for an observer-friendly overview. Consult the linked SIMBAD record for component-level identifiers, bibliography, measurement provenance and newer catalogue values.
The name Denebola
Denebola comes from Arabic dhanab al-asad, “tail of the lion.” It is one of several star names beginning with Deneb, a clue that each originally marked the tail of a different celestial creature.
The Lion is among the ancient zodiacal figures, and Arabic astronomers preserved a practical anatomical label for its tail. Bayer assigned the star Beta Leonis even though brightness rankings can depend on passband and comparison. Denebola also marks one corner of the historical Spring Triangle in some modern observing guides, alongside Arcturus and Spica, although triangle membership is an informal asterism rather than an official designation.
Modern professional catalogues retain identifiers such as the Bayer designation alongside a proper name. The International Astronomical Union standardizes which name belongs to which component—an important distinction for systems whose combined light looks like one star from Earth.
How to find Denebola
Find Leo's Sickle and bright Regulus, then follow the body east to the isolated star at the Lion's tail. Denebola is easy to see without optical aid. Binoculars emphasize its white colour and provide a broad route onward toward Virgo and the Coma Berenices star field.
Visible from nearly all populated latitudes and best during northern spring or southern autumn. Visibility on a particular night still depends on latitude, season, time, horizon obstructions, weather and local light pollution. Use the interactive atlas below to check the surrounding field before observing.
Observation checklist
- Best evening visibility is March through June.
- Trace Leo eastward from Regulus to the tail.
- Binoculars reveal field context but not the debris disc.
- Do not confuse infrared evidence for dust with a visible ring at the eyepiece.
Interesting facts about Denebola
- Denebola lies only about 36 light-years away.
- Infrared excess reveals a circumstellar debris disc.
- Its Arabic name means tail of the lion.
- It is a hotter, younger main-sequence star than the Sun.
- It is sometimes used as a corner of the informal Spring Triangle.
Continue from Denebola into the night sky
Use the Leo constellation guide to place this star within its larger pattern. When you are ready to observe, compare dark-sky places, find a nearby observatory, or follow our practical guide to finding a star in the night sky. Symbolically registered names are kept separately in the searchable Star-Register catalogue.
Sources and further reading
Measurements are rounded for readability. Multiple systems, variable stars and distant supergiants can have component-specific or model-dependent values. Survey panels show photographic sky fields, not the physical surface of the star.