10 Delphini
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 41m 16.2079s |
| Declination | +14° 34′ 58.3606″ |
| Apparent magnitude (V) | 6.00±0.01 |
| Characteristics | |
| Spectral type | K4 III |
| U−B color index | +1.44 |
| B−V color index | +1.24 |
| Astrometry | |
| Radial velocity (Rv) | −32±2 km/s |
| Proper motion (μ) | RA: −9.462 mas/yr Dec.: −0.344 mas/yr |
| Parallax (π) | 6.6178±0.0397 mas |
| Distance | 493 ± 3 ly (151.1 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.06 |
| Details | |
| Mass | 2.42±0.71 M☉ |
| Radius | 18.47+1.02 −1.03 R☉ |
| Luminosity | 125±2 L☉ |
| Surface gravity (log g) | 2.27 cgs |
| Temperature | 4,378 K |
| Metallicity [Fe/H] | 0.00 dex |
| Age | 794±33 Myr |
| Other designations | |
| 10 Del, AG+14°2269, BD+14°4393, GC 28826, HD 197121, HIP 102080, HR 7918, SAO 106384 | |
| Database references | |
| SIMBAD | data |
10 Delphini (10 Del) is a solitary star in the equatorial constellation Delphinus. It has an apparent magnitude of 6.00, allowing it to be faintly seen with the naked eye. Parallax measurements put the object at a distance of 493 light years but is drifting closer with a heliocentric radial velocity of −32 km/s.
10 Delphini has a stellar classification of K4 III or K2 III, both indicating that it is a red giant. However, there is some uncertainty behind the first classification. It has twice the mass of the Sun but at an age of 794 million years — expanded to 18 times the radius of the Sun. It shines at 125 L☉ from its enlarged photosphere at an effective temperature of 4,378 K, giving it an orange glow. 10 Del has a solar metallicity.
10 Del has been suspected to be a variable star, although it hasn't been catalogued as such in the GCVS.