HD 91190
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| Right ascension | 10h 35m 05.49379s |
| Declination | +75° 42′ 46.4541″ |
| Apparent magnitude (V) | 4.86 |
| Characteristics | |
| Spectral type | G8 III-IIIb |
| B−V color index | 0.957±0.003 |
| Astrometry | |
| Radial velocity (Rv) | +16.6 km/s |
| Proper motion (μ) | RA: −0.599 mas/yr Dec.: −17.436 mas/yr |
| Parallax (π) | 4.5045±0.1730 mas |
| Distance | 720 ± 30 ly (222 ± 9 pc) |
| Absolute magnitude (MV) | +0.46 |
| Details | |
| Mass | 2.39 M☉ |
| Luminosity | 69 L☉ |
| Surface gravity (log g) | 2.59 cgs |
| Temperature | 4,965±106 K |
| Metallicity [Fe/H] | −0.03 dex |
| Age | 2.06 Gyr |
| Other designations | |
| BD+76°393, FK5 395, HD 91190, HIP 51808, HR 4126, SAO 7164 | |
| Database references | |
| SIMBAD | data |
HD 91190 is a suspected astrometric binary star system in the northern circumpolar constellation of Draco. It is faintly visible to the naked eye, having an apparent visual magnitude of 4.86. The distance to HD 91190, as estimated from its annual parallax shift of 4.5 mas, is around 720 light years. This system is moving further away from the Sun with a heliocentric radial velocity of +17 km/s, having come to within 170 ly some 2.4 million years ago.
At the age of about two billion years, this is an evolved G-type giant star with a stellar classification of G8 III-IIIb. It has 2.39 times the mass of the Sun and is radiating 69 times the Sun's luminosity from its photosphere at an effective temperature of around 4,965 K.