Key facts
- Category
- Stars
- Object class
- F-type subgiant star
- Mass
- ~1.48 solar masses
- Host
- Procyon system
- Scale fact
- 2.84 million kmdiameter
- Estimated age
- ~1.9 billion years
- Composition
- Hydrogen and helium
- Temperature
- ~6,580 K surface
Procyon A
2.84 million kmdiameter
Visual creditscaleofspace.org / CC BY-NC 4.0
Details
Procyon A is the bright F-type primary of the Procyon binary and has begun to swell beyond an ordinary main-sequence star. Its faint companion, Procyon B, is already a white dwarf.
Procyon A is a nearby F-type subgiant that has begun expanding after using much of the hydrogen in its core. At about twice the Sun’s diameter, it represents a transitional stage between an ordinary main-sequence star and a red giant.
Its companion Procyon B is already a white dwarf. The two stars formed together but evolved at different rates because the star that became Procyon B began with more mass and exhausted its fuel sooner.
Links
- Editorial guides
- Universe journey
- Solar neighborhood
- Preset views
- Wikipedia
- Procyon A on Wikipedia
Size neighbors
Objects near Procyon A on the scale
Sources
References for Procyon A
Measurements and descriptive context are compiled by the Scale of Space team from the references below. If you find an error, please let us know.
- Procyon A — Wikipedia
- Visual: scaleofspace.org / CC BY-NC 4.0
Continue with nearby objects or open the full scale.
About
Scale of Space is a scroll-based journey through the universe, placing objects on a single logarithmic scale so you can compare size across an unbroken range.
Guides explain selected parts of that range, while focused views filter the objects by subject.