15 Delphini (15 Del) is a star in the equatorial constellation 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 J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Delphinus |
Right ascension | 20h 49m 37.7673s[1] |
Declination | +12° 32′ 42.4589″[1] |
Apparent magnitude (V) | 5.99±0.01[2] |
Characteristics | |
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 | 1.23[7] M☉ |
Radius | 1.42+0.02 −0.04[8] R☉ |
Luminosity | 3.01±0.01[8] L☉ |
Surface gravity (log g) | 4.24[7] cgs |
Temperature | 6,624±50[9] K |
Metallicity [Fe/H] | −0.13±0.03[9] dex |
Rotational velocity (v sin i) | 5.6±0.3[10] km/s |
Age | 1.21±0.63[9] Gyr |
Other designations | |
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 123% the mass of the Sun[7] and a diameter of 1.42 R☉.[8] It radiates at 3 times the luminosity of the Sun[8] from its photosphere at an effective temperature of 6,624 K,[9] 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[9] — spins leisurely with a projected rotational velocity of 5.6 km/s.[10]
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,[12] but its parallax indicates a further distance compared to 15 Delphini.[13]
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 |