2 Sextantis
Star in the constellation Hydra From Wikipedia, the free encyclopedia
2 Sextantis is a single[7] 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.[3] This object is moving further from the Earth with a heliocentric radial velocity of +44.6 km/s.[4] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.173″ per year.[8]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Hydra[1] |
| Right ascension | 09h 38m 27.28962s[2] |
| Declination | +04° 38′ 57.4461″[2] |
| Apparent magnitude (V) | 4.68[3] |
| Characteristics | |
| Evolutionary stage | giant |
| Spectral type | K3 III[3] |
| B−V color index | +1.310±0.033[1] |
| Astrometry | |
| Radial velocity (Rv) | +44.61±0.23[4] km/s |
| Proper motion (μ) | RA: −163.18[2] mas/yr Dec.: −50.88[2] mas/yr |
| Parallax (π) | 11.04±0.27 mas[2] |
| Distance | 295 ± 7 ly (91 ± 2 pc) |
| Absolute magnitude (MV) | −0.10[1] |
| Details | |
| Mass | 1.32[3] M☉ |
| Radius | 24[4] R☉ |
| Luminosity | 190.5[3] L☉ |
| Surface gravity (log g) | 2.09±0.22[5] cgs |
| Temperature | 4,188±33[3] K |
| Metallicity [Fe/H] | −0.30±0.09[5] dex |
| Rotational velocity (v sin i) | 3.0[4] km/s |
| Age | 4.58[3] Gyr |
| Other designations | |
| 2 Sex, BD+05° 2207, FK5 1249, HD 83425, HIP 47310, HR 3834, SAO 117821[6] | |
| Database references | |
| SIMBAD | data |
This is a giant star with a stellar classification of K3 III,[3] which, at the age of 4.58[3] billion years old, has exhausted the hydrogen at its core and evolved away from the main sequence. The star has 1.32[3] times the mass of the Sun and has expanded to 24[4] times the Sun's radius. It is radiating 190.5[3] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,188 K.[3]
References
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