15 Delphini
Star in the constellation of Delphinus
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15 Delphini (15 Del) is a star in the northern constellation of Delphinus. It has an apparent magnitude of 5.99,[2] allowing it to be faintly seen with the naked eye. The star is relatively close at a distance of 99 light years[1] but is receding with a heliocentric radial velocity of 4.1 km/s.[5]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 49m 37.7673s[1] |
| Declination | +12° 32′ 42.459″[1] |
| Apparent magnitude (V) | 5.99±0.01[2] |
| Characteristics | |
| Evolutionary stage | main sequence[1] |
| Spectral type | F5 V[3] |
| U−B color index | −0.06[4] |
| B−V color index | +0.42[4] |
| Astrometry | |
| Radial velocity (Rv) | 4.1±0.4[5] km/s |
| Proper motion (μ) | RA: +52.776 mas/yr[1] Dec.: +97.020 mas/yr[1] |
| Parallax (π) | 33.0028±0.0322 mas[1] |
| Distance | 98.83 ± 0.10 ly (30.30 ± 0.03 pc) |
| Absolute magnitude (MV) | +3.58[6] |
| Details | |
| Mass | 1.28[7] M☉ |
| Radius | 1.40[7] R☉ |
| Luminosity | 2.98[7] L☉ |
| Surface gravity (log g) | 4.25[7] cgs |
| Temperature | 6,624±50[8] K |
| Metallicity [Fe/H] | −0.13±0.03[8] dex |
| Rotational velocity (v sin i) | 5.6±0.3[9] km/s |
| Age | 1.21±0.63[8] Gyr |
| Other designations | |
| 15 Del, AG+12°2395, BD+12°4472, GC 29037, HD 198390, HIP 102805, HR 7973, SAO 106536, WDS J20496+1233A[10] | |
| Database references | |
| SIMBAD | data |
15 Del has a stellar classification of F5 V,[3] indicating that it is an ordinary F-type main-sequence star. It has 128% the mass of the Sun and a radius of 1.4 R☉.[7] It radiates at 3 times the luminosity of the Sun[7] from its photosphere at an effective temperature of 6,624 K,[8] 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[8] — spins leisurely with a projected rotational velocity of 5.6 km/s.[9]
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,[11] but its parallax indicates a further distance compared to 15 Delphini.[12]