HD 91190
Star in the constellation Draco
From Wikipedia, the free encyclopedia
HD 91190 is a suspected astrometric binary[7] 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.[1] The distance to HD 91190, as estimated from its annual parallax shift of 13.0 mas,[2] is around 250 light years. This system is moving further away from the Sun with a heliocentric radial velocity of +17 km/s,[4] having come to within 170 ly some 2.4 million years ago.[1]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Draco[1] |
| Right ascension | 10h 35m 05.49034s[2] |
| Declination | +75° 42′ 46.4467″[2] |
| Apparent magnitude (V) | 4.86[1] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | G8 III-IIIb[3] |
| B−V color index | 0.957±0.003[1] |
| Astrometry | |
| Radial velocity (Rv) | +16.6[4] km/s |
| Proper motion (μ) | RA: −20.218[2] mas/yr Dec.: +1.482[2] mas/yr |
| Parallax (π) | 13.0453±0.1053 mas[2] |
| Distance | 250 ± 2 ly (76.7 ± 0.6 pc) |
| Absolute magnitude (MV) | +0.46[1] |
| Details | |
| Mass | 2.39[4] M☉ |
| Luminosity | 69[4] L☉ |
| Surface gravity (log g) | 2.59[5] cgs |
| Temperature | 4,965±106[4] K |
| Metallicity [Fe/H] | −0.03[5] dex |
| Age | 2.06[4] Gyr |
| Other designations | |
| BD+76°393, FK5 395, HD 91190, HIP 51808, HR 4126, SAO 7164[6] | |
| Database references | |
| SIMBAD | data |
At the age of about two billion years,[4] this is an evolved G-type giant star with a stellar classification of G8 III-IIIb.[3] It has 2.39[4] times the mass of the Sun and is radiating 69[4] times the Sun's luminosity from its photosphere at an effective temperature of around 4,965 K.[4]