15 Delphini
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 49m 37.7673s |
| Declination | +12° 32′ 42.4589″ |
| Apparent magnitude (V) | 5.99±0.01 |
| Characteristics | |
| Spectral type | F5 V |
| U−B color index | −0.06 |
| B−V color index | +0.42 |
| Astrometry | |
| Radial velocity (Rv) | 4.1±0.4 km/s |
| Proper motion (μ) | RA: +52.776 mas/yr Dec.: +97.020 mas/yr |
| Parallax (π) | 33.0028±0.0322 mas |
| Distance | 98.83 ± 0.10 ly (30.30 ± 0.03 pc) |
| Absolute magnitude (MV) | +3.58 |
| Details | |
| Mass | 1.23 M☉ |
| Radius | 1.42+0.02 −0.04 R☉ |
| Luminosity | 3.01±0.01 L☉ |
| Surface gravity (log g) | 4.24 cgs |
| Temperature | 6,624±50 K |
| Metallicity [Fe/H] | −0.13±0.03 dex |
| Rotational velocity (v sin i) | 5.6±0.3 km/s |
| Age | 1.21±0.63 Gyr |
| Other designations | |
| 15 Del, AG+12°2395, BD+12°4472, GC 29037, HD 198390, HIP 102805, HR 7973, SAO 106536, WDS J20496+1233A | |
| Database references | |
| SIMBAD | data |
15 Delphini (15 Del) is a star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.99, allowing it to be faintly seen with the naked eye. The star is relatively close at a distance of 99 light years but is receding with a heliocentric radial velocity of 4.1 km/s.
15 Del has a stellar classification of F5 V, indicating that it is an ordinary F-type main-sequence star. It has 123% the mass of the Sun and a diameter of 1.42 R☉. It radiates at 3 times the luminosity of the Sun from its photosphere at an effective temperature of 6,624 K, giving a yellow-white hue. 15 Del has an iron abundance 74% that of the Sun and at an age of 1.21 billion years — spins leisurely with a projected rotational velocity of 5.6 km/s.
15 Delphini has 3 companions listed below. Components B and D have different proper motions compared to the host. However, C appears to have a common proper motion, suggesting physical relation, but its parallax indicates a further distance compared to 15 Delphini.
| Companion | mv | PA (°) | Year | Sep. (″) |
|---|---|---|---|---|
| B | 14.10 | 19 | 2013 | 52.1 |
| C | 11.07 | 86 | 2020 | 105.5 |
| D | 11.89 | 276 | 2020 | 189.6 |