18 Delphini
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 58m 25.93353s |
| Declination | +10° 50′ 21.4309″ |
| Apparent magnitude (V) | 5.506 |
| Characteristics | |
| Evolutionary stage | red clump |
| Spectral type | G6III |
| B−V color index | 0.934±0.004 |
| Astrometry | |
| Radial velocity (Rv) | +4.17±0.12 km/s |
| Proper motion (μ) | RA: −49.921 mas/yr Dec.: −34.509 mas/yr |
| Parallax (π) | 13.3021±0.0652 mas |
| Distance | 245 ± 1 ly (75.2 ± 0.4 pc) |
| Absolute magnitude (MV) | 1.15 |
| Details | |
| Mass | 2.35±0.07 M☉ |
| Radius | 7.19±0.38 R☉ |
| Luminosity | 33.9+6.9 −5.7 L☉ |
| Surface gravity (log g) | 3.00±0.04 cgs |
| Temperature | 5,071±10 K |
| Metallicity [Fe/H] | 0.10±0.02 dex |
| Rotational velocity (v sin i) | 1.60±0.45 km/s |
| Age | 690±50 Myr |
| Other designations | |
| Musica, 18 Del, BD+10°4425, GC 29266, HD 199665, HIP 103527, HR 8030, SAO 106712, WDS J20584+1050A | |
| Database references | |
| SIMBAD | A |
| B | |
| Exoplanet Archive | data |
18 Delphini, also named Musica /ˈmjuːzɪkə/, is a binary star in the constellation of Delphinus of the low northern hemisphere. The primary has a Sun-like golden hue and is faintly visible to the naked eye with an apparent visual magnitude of 5.506. It has a red dwarf companion at a wide separation. The star is located at a distance of approximately 245 light-years from the Sun based on parallax, and it is drifting further away with a radial velocity of +4 km/s. An object believed to be an extrasolar planet (designated 18 Delphini b or Arion) orbits the primary star.