Alfirk
star · Cepheus · 3.2ᵐ
Blue-white star in Cepheus.
Notable facts
The light you see today left Alfirk around the year 1341.
About 13 times brighter than the faintest star visible to the naked eye.
In brief
Which constellation is Alfirk in?
Alfirk lies in Cepheus.
Is Alfirk visible to the naked eye?
3.2ᵐ — visible to the naked eye (under dark skies).
When is the best time to observe Alfirk?
Best observed in August.
Data
- RA / Dec (J2000)
- 21h 29m · +70° 34′
- Type
- star
- Constellation
- Cepheus
- How to observe
- 3.2ᵐ — visible to the naked eye (under dark skies)
- Spectral class
- B2IIIv SB — blue-white star
- Absolute magnitude
- -3.4ᵐ
- Luminosity
- ≈1,923 × the Sun
- Distance
- ~685 light years
- Designation
- HIP 106032
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° | 79° · never sets | — |
| +55° | 74° · never sets | — |
| +45° | 64° · never sets | — |
| +30° | 49° · never sets | — |
| 0° | 19° | 19° |
| −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 | 13:43 |
| February | 11:36 |
| March | 09:51 |
| April | 07:57 |
| May | 06:03 |
| June | 03:57 |
| July | 01:53 |
| August | 23:52 |
| September | 21:59 |
| October | 20:10 |
| November | 18:09 |
| December | 16:01 |
Upper culmination in local solar time — no time-zone or daylight-saving correction applied.