2 Sextantis
2 Sextantis is a single star that is now in the equatorial constellation Hydra, located around 295 light years away from the Sun. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.68. This object is moving further from the Earth with a heliocentric radial velocity of +44.6 km/s. It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.173″ per year.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Hydra |
| Right ascension | 09h 38m 27.28962s |
| Declination | +04° 38′ 57.4461″ |
| Apparent magnitude (V) | 4.68 |
| Characteristics | |
| Evolutionary stage | giant |
| Spectral type | K3 III |
| B−V color index | +1.310±0.033 |
| Astrometry | |
| Radial velocity (Rv) | +44.61±0.23 km/s |
| Proper motion (μ) | RA: −163.18 mas/yr Dec.: −50.88 mas/yr |
| Parallax (π) | 11.04 ± 0.27 mas |
| Distance | 295 ± 7 ly (91 ± 2 pc) |
| Absolute magnitude (MV) | −0.10 |
| Details | |
| Mass | 1.32 M☉ |
| Radius | 24 R☉ |
| Luminosity | 190.5 L☉ |
| Surface gravity (log g) | 2.09±0.22 cgs |
| Temperature | 4,188±33 K |
| Metallicity [Fe/H] | −0.30±0.09 dex |
| Rotational velocity (v sin i) | 3.0 km/s |
| Age | 4.58 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a giant star with a stellar classification of K3 III, which, at the age of 4.58 billion years old, has exhausted the hydrogen at its core and evolved away from the main sequence. The star has 1.32 times the mass of the Sun and has expanded to 24 times the Sun's radius. It is radiating 190.5 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,188 K.