Alioth
star · Ursa Major · 1.8ᵐ
White star in Ursa Major.
Notable facts
The light you see today left Alioth around the year 1943.
About 50 times brighter than the faintest star visible to the naked eye.
In brief
Which constellation is Alioth in?
Alioth lies in Ursa Major.
Is Alioth visible to the naked eye?
1.8ᵐ — visible to the naked eye (under dark skies).
When is the best time to observe Alioth?
Best observed in April.
Data
- RA / Dec (J2000)
- 12h 54m · +55° 58′
- Type
- star
- Constellation
- Ursa Major
- How to observe
- 1.8ᵐ — visible to the naked eye (under dark skies)
- Spectral class
- A0p — white star
- Absolute magnitude
- -0.3ᵐ
- Luminosity
- ≈109 × the Sun
- Distance
- ~83 light years
- Designation
- HIP 62956
Observing tip
Stars stay points at any magnification: aim your telescope for colour, brightness and companions, not detail.
Altitude above the horizon by latitude
| Latitude | Maximum altitude | Rise azimuth |
|---|---|---|
| +60° | 86° · never sets | — |
| +55° | 89° · never sets | — |
| +45° | 79° · never sets | — |
| +30° | 64° | 17° |
| 0° | 34° | 34° |
| −35° | never rises | — |
Geometric altitude at upper culmination, atmospheric refraction not included. Positive latitudes are in the northern hemisphere.
Culmination time by month
| Month | Culmination |
|---|---|
| January | 05:09 |
| February | 03:01 |
| March | 01:16 |
| April | 23:23 |
| May | 21:28 |
| June | 19:22 |
| July | 17:18 |
| August | 15:17 |
| September | 13:24 |
| October | 11:35 |
| November | 09:35 |
| December | 07:26 |
Upper culmination in local solar time — no time-zone or daylight-saving correction applied.