Sadr
star · Cygnus · 2.2ᵐ
Yellow-white star in Cygnus.
Notable facts
The light you see today left Sadr around the year 193.
About 32 times brighter than the faintest star visible to the naked eye.
In brief
Which constellation is Sadr in?
Sadr lies in Cygnus.
Is Sadr visible to the naked eye?
2.2ᵐ — visible to the naked eye (under dark skies).
When is the best time to observe Sadr?
Best observed in July.
Data
- RA / Dec (J2000)
- 20h 22m · +40° 15′
- Type
- star
- Constellation
- Cygnus
- How to observe
- 2.2ᵐ — visible to the naked eye (under dark skies)
- Spectral class
- F8Ib — yellow-white star
- Absolute magnitude
- -6.5ᵐ
- Luminosity
- ≈34,674 × the Sun
- Distance
- ~1,833 light years
- Designation
- HIP 100453
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° | 70° · never sets | — |
| +55° | 75° · never sets | — |
| +45° | 85° | 24° |
| +30° | 80° | 42° |
| 0° | 50° | 50° |
| −35° | 15° | 38° |
Geometric altitude at upper culmination, atmospheric refraction not included. Positive latitudes are in the northern hemisphere.
Culmination time by month
| Month | Culmination |
|---|---|
| January | 12:37 |
| February | 10:29 |
| March | 08:44 |
| April | 06:51 |
| May | 04:56 |
| June | 02:50 |
| July | 00:46 |
| August | 22:45 |
| September | 20:52 |
| October | 19:04 |
| November | 17:03 |
| December | 14:54 |
Upper culmination in local solar time — no time-zone or daylight-saving correction applied.