Acrab B
star · Scorpius · 4.9ᵐ
Blue-white star in Scorpius.
Notable facts
The light you see today left Acrab B around the year 1628.
About 3 times brighter than the faintest star visible to the naked eye.
In brief
Which constellation is Acrab B in?
Acrab B lies in Scorpius.
Is Acrab B visible to the naked eye?
4.9ᵐ — visible to the naked eye (under dark skies).
When is the best time to observe Acrab B?
Best observed in May.
Data
- RA / Dec (J2000)
- 16h 05m · −19° 48′
- Type
- star
- Constellation
- Scorpius
- How to observe
- 4.9ᵐ — visible to the naked eye (under dark skies)
- Spectral class
- B2V — blue-white star
- Absolute magnitude
- -0.5ᵐ
- Luminosity
- ≈139 × the Sun
- Distance
- ~398 light years
- Designation
- HIP 78821
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° | 10° | 133° |
| +55° | 15° | 126° |
| +45° | 25° | 119° |
| +30° | 40° | 113° |
| 0° | 70° | 110° |
| −35° | 75° | 114° |
Geometric altitude at upper culmination, atmospheric refraction not included. Positive latitudes are in the northern hemisphere.
Culmination time by month
| Month | Culmination |
|---|---|
| January | 08:20 |
| February | 06:13 |
| March | 04:27 |
| April | 02:34 |
| May | 00:40 |
| June | 22:33 |
| July | 20:30 |
| August | 18:29 |
| September | 16:36 |
| October | 14:47 |
| November | 12:46 |
| December | 10:38 |
Upper culmination in local solar time — no time-zone or daylight-saving correction applied.