Delta Draconis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| Right ascension | 19h 12m 33.30137s |
| Declination | +67° 39′ 41.5392″ |
| Apparent magnitude (V) | 3.07 |
| Characteristics | |
| Spectral type | G9 III |
| U−B color index | +0.78 |
| B−V color index | +1.00 |
| Astrometry | |
| Radial velocity (Rv) | 24.71±0.16 km/s |
| Proper motion (μ) | RA: +94.599 mas/yr Dec.: +92.374 mas/yr |
| Parallax (π) | 33.3499±0.1567 mas |
| Distance | 97.8 ± 0.5 ly (30.0 ± 0.1 pc) |
| Absolute magnitude (MV) | +0.62 |
| Details | |
| Mass | 1.70±0.18 M☉ |
| Radius | 10.62±0.07 R☉ |
| Luminosity | 59 L☉ |
| Surface gravity (log g) | 2.59±0.05 cgs |
| Temperature | 4,831±13 K |
| Metallicity [Fe/H] | −0.13±0.05 dex |
| Rotational velocity (v sin i) | 8 km/s |
| Age | 1.66±0.35 Gyr |
| Other designations | |
| Aldib, Altais, Nodus Secundus, 57 Draconis, HR 7310, BD+67 1129, HD 180711, SAO 18222, FK5 723, HIP 94376. | |
| Database references | |
| SIMBAD | data |
Delta Draconis (δ Draconis, abbreviated Delta Dra, δ Dra), formally named Altais /ælˈteɪ.ɪs/, is a yellow star in the constellation of Draco. It has an apparent visual magnitude of 3.0, making it easily visible to the naked eye. Based on parallax measurements obtained by the Gaia mission, it is approximately 97.8 light-years (30.0 parsecs) from the Sun.