36 G. Doradus
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Dorado |
| Right ascension | 05h 54m 06.05459s |
| Declination | −63° 05′ 23.2090″ |
| Apparent magnitude (V) | 4.65 |
| Characteristics | |
| Spectral type | K2 III |
| B−V color index | 1.022±0.045 |
| Astrometry | |
| Radial velocity (Rv) | +25.1±0.8 km/s |
| Proper motion (μ) | RA: +148.129 mas/yr Dec.: +550.143 mas/yr |
| Parallax (π) | 36.5981±0.0924 mas |
| Distance | 89.1 ± 0.2 ly (27.32 ± 0.07 pc) |
| Absolute magnitude (MV) | 2.56 |
| Details | |
| Mass | 1.28±0.03 M☉ |
| Radius | 4.76±0.14 R☉ |
| Luminosity | 9.68±0.40 L☉ |
| Surface gravity (log g) | 3.020±0.155 cgs |
| Temperature | 4,807±62 K |
| Metallicity [Fe/H] | +0.141±0.035 dex |
| Age | 7.91 Gyr |
| Other designations | |
| CD−63°218, FK5 2452, GJ 224.1, GJ 9194, HD 40409, HIP 27890, HR 2102, SAO 249390 | |
| Database references | |
| SIMBAD | data |
36 G. Doradus (HD 40409) is a suspected astrometric binary star system in the southern constellation of Dorado. It is a faint system but visible to the naked eye with an apparent visual magnitude of 4.65. Based upon an annual parallax shift of 36.60 mas, it is located 89 light years away from the Sun. It is moving further away with a heliocentric radial velocity of +25 km/s. The system has a relatively high proper motion, traversing the celestial sphere at the rate of 0.57 arcseconds per year along a position angle of 14.51°.
Based on the stellar classification of K2 III assigned by Gray et al. (2006), the visible component is a K-type giant star. In contrast, Keenan and McNeil (1989) gave it a somewhat less evolved classification of K2 III–IV. It is about eight billion years old with 28% more mass than the Sun, and has expanded to 4.76 times the Sun's radius. The star is radiating 10 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,807 K.