Delta Aquarii
Delta Aquarii (δ Aquarii, abbreviated Delta Aqr, δ Aqr), officially named Skat /ˈskæt/, is the third-brightest star in the constellation of Aquarius. The apparent visual magnitude is 3.3, which can be seen with the naked eye. The distance to this star is about 113 light-years (35 parsecs) based upon parallax measurements, and it has a close companion.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 22h 54m 39.0125s |
| Declination | −15° 49′ 14.953″ |
| Apparent magnitude (V) | 3.28 |
| Characteristics | |
| Spectral type | A3Vp |
| U−B color index | +0.08 |
| B−V color index | +0.05 |
| Astrometry | |
| Radial velocity (Rv) | +18.0 km/s |
| Proper motion (μ) | RA: -38.904 mas/yr Dec.: -33.027 mas/yr |
| Parallax (π) | 28.7936 ± 0.7289 mas |
| Distance | 113 ± 3 ly (34.7 ± 0.9 pc) |
| Absolute magnitude (MV) | −0.17 |
| Details | |
| Mass | 2.51 M☉ |
| Radius | 2.4 R☉ |
| Luminosity | 48 L☉ |
| Surface gravity (log g) | 3.73 cgs |
| Temperature | 8,650 K |
| Metallicity [Fe/H] | –0.21 dex |
| Rotational velocity (v sin i) | 81 km/s |
| Age | 0.3 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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