Gamma Doradus, Latinized from γ Doradus, is the third-brightest star in the southern constellation of Dorado.[11] It is faintly visible to the naked eye with an apparent visual magnitude of approximately 4.25, and is a variable star, the prototype of the class of Gamma Doradus variables.[3] The star is located at a distance of 67 light years from the Sun based on parallax,[2] and is drifting further away with a radial velocity of +25 km/s.[6] Based on its motion through space, it appears to be a member of the IC 2391 supercluster.[12]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Dorado |
| Right ascension | 04h 16m 01.58823s[2] |
| Declination | −51° 29′ 11.9191″[2] |
| Apparent magnitude (V) | 4.25[3] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | F1V[4] |
| U−B color index | +0.03[5] |
| B−V color index | +0.30[5] |
| R−I color index | +0.16[5] |
| Variable type | γ Dor[3] |
| Astrometry | |
| Radial velocity (Rv) | +25.2±0.5[6] km/s |
| Proper motion (μ) | RA: +99.463[2] mas/yr Dec.: +183.353[2] mas/yr |
| Parallax (π) | 48.8984 ± 0.2817 mas[2] |
| Distance | 66.7 ± 0.4 ly (20.5 ± 0.1 pc) |
| Absolute magnitude (MV) | 2.72[3] |
| Details | |
| Mass | 1.56±0.06[7] M☉ |
| Radius | 1.85+0.25 −0.10[2] R☉ |
| Luminosity | 6.999+0.051 −0.052[2] L☉ |
| Luminosity (bolometric) | 7.0[3] L☉ |
| Surface gravity (log g) | 4.29±0.18[8] cgs |
| Temperature | 6,906+89 −423[2] K |
| Metallicity [Fe/H] | +0.05±0.14[8] dex |
| Rotational velocity (v sin i) | 56.6±0.5[9] km/s |
| Age | 0.535–1.207[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an F-type main-sequence star with a stellar classification of F1V.[4] It is a pulsating variable that varies in brightness by less than a tenth of a magnitude owing to nonradial gravity wave oscillations.[3] Four pulsation frequencies have been identified with periods of 17.6, 12.8, 16.3, and 18.2 hours.[9][13] The star is around 0.5–1.2 billion years old and is spinning with a projected rotational velocity of 57 km/s.[9] It has 1.6[7] times the mass of the Sun and 1.9[2] times the Sun's radius. The star is radiating seven[2] times the luminosity of the Sun from its photosphere at an effective temperature of 6,906 K.[2]
An infrared excess has been detected at multiple frequencies,[14] indicating that the star is being orbited by a pair of debris disks.[15]