- Surface temperature
- 10,410 K
- Radius
- 3.23 × the Sun
- Luminosity
- 110 × the Sun
- Spectral type
- A0p
Cataloged star · Database record + computed analysis
Alioth
Designation: 77Eps UMa · HIP 62956 · HD 112185
A real star from the HYG catalog in the constellation Ursa Major.
A-type: white and crisp
Its spectral type is A0p: surfaces around 7,500–10,000 °C; Sirius and Vega are the classic examples. From its measured color, its surface temperature is roughly 10,408 K (10,135 °C), an estimate computed from the catalog's color index.
How far away is it?
It lies 82.6 light-years away (25.31 parsecs, from its measured parallax), within the Sun's wider neighborhood; its light is only 82.6 years old when it reaches your eye.
How powerful is it?
Its computed luminosity is about 110.3 times the Sun's output (derived from its brightness and distance).
Can you see it?
At apparent magnitude 1.76, it is an easy naked-eye star under any reasonable sky. It favors northern observers.
It varies
This is a catalogued variable star (Eps): its brightness measurably changes over time, whether by pulsation, eclipses in a double system, or surface activity.
Everything above is computed from the catalog’s measured values for this star. Where a value is missing, the statement is omitted rather than guessed.
About this record
Data: the HYG stellar database v4.1 (Hipparcos + Yale + Gliese, CC BY-SA, © David Nash / astronexus). Want the full stories? Our deep star guides cover Sirius, Betelgeuse, Proxima Centauri, Vega and three dozen more. You can also browse the catalog or learn how stars live and die.