Beta Aquarii
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|
β Aquarii |
|
| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Aquarius |
| Right ascension | 21h 31m 33.5341s |
| Declination | -05° 34′ 16.22″ |
| Apparent magnitude (V) | 2.91 |
| Characteristics | |
| Spectral type | G0Ib |
| U-B color index | 0.56 |
| B-V color index | 0.83 |
| Astrometry | |
| Radial velocity (Rv) | 6.5 km/s |
| Proper motion (μ) | RA: 22.79 mas/yr Dec.: -6.70 mas/yr |
| Parallax (π) | 5.33 ± 0.94 mas |
| Distance | approx. 600 ly (approx. 190 pc) |
| Absolute magnitude (MV) | 3.74 |
| Details | |
| Mass | ? M☉ |
| Radius | ? R☉ |
| Luminosity | ? L☉ |
| Temperature | ? K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Visual binary orbit | |
| Companion | β Aquarii B |
| Semimajor axis (a) | 34.3" |
| Inclination (i) | 319° |
| Visual binary orbit | |
| Companion | β Aquarii C |
| Semimajor axis (a) | 54.5" |
| Inclination (i) | 186° |
| Other designations | |
| Database references | |
| SIMBAD | data |
(β Aqr / β Aquarii) is the brightest star in the constellation Aquarius. It also has the traditional name Sadalsuud, which derives from an Arabic expression سعد السعود sacd as-sucūd, meaning "luck of lucks".
Sadalsuud has a stellar magnitude of +2,90 m. It belongs to the spectral class G0Ib, and is 610 light years from Earth. It is a member of a rare class of stars known as yellow supergiants.
[edit] Location
The star's location in the sky is shown in the following map of the constellation Aquarius:
[edit] Components
| NAME | Right ascension | Declination | Apparent magnitude (V) | Database references |
|---|---|---|---|---|
| β Aquarii B (BD-06 5770B) | 21h 31m 31.9s | -05° 33' 46 | 11.0 | Simbad |
| β Aquarii C (BD-06 5770C) | 21h 31m 33.0s | -05° 35' 10 | 11.6 | Simbad |
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