18 Delphini
18 Delphini, also named Musica /ˈmjuːzɪkə/, is a single star in the constellation of Delphinus of the low northern hemisphere. It has a Sun-like golden hue and is faintly visible to the naked eye with an apparent visual magnitude of 5.506. The star is located at a distance of approximately 249 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 star.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Delphinus |
| Right ascension | 20h 58m 25.9336s |
| Declination | +10° 50′ 21.4261″ |
| Apparent magnitude (V) | 5.506 |
| Characteristics | |
| Spectral type | G6III |
| B−V color index | 0.934±0.004 |
| Astrometry | |
| Radial velocity (Rv) | +4.35±0.15 km/s |
| Proper motion (μ) | RA: −50.034±0.147 mas/yr Dec.: −34.198±0.175 mas/yr |
| Parallax (π) | 13.0922 ± 0.1062 mas |
| Distance | 249 ± 2 ly (76.4 ± 0.6 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 | |
| Database references | |
| SIMBAD | data |
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