24 Sextantis
24 Sextantis, often abbreviated as 24 Sex, is the Flamsteed designation of a 7th-magnitude star located approximately 236 light years away in the constellation of Sextans. At an apparent visual magnitude of 6.61, this star can only be viewed from rural skies under good seeing conditions.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sextans |
| Right ascension | 10h 23m 28.3694s |
| Declination | –00° 54′ 08.0772″ |
| Apparent magnitude (V) | 6.61 ± 0.04 |
| Characteristics | |
| Spectral type | K0 IV |
| B−V color index | 0.92 ± 0.01 |
| Astrometry | |
| Radial velocity (Rv) | 7.08 ± 0.16 km/s |
| Proper motion (μ) | RA: 65.220±0.167 mas/yr Dec.: −36.272±0.244 mas/yr |
| Parallax (π) | 13.8488 ± 0.1298 mas |
| Distance | 236 ± 2 ly (72.2 ± 0.7 pc) |
| Absolute magnitude (MV) | 2.17 ± 0.06 |
| Details | |
| Mass | 1.54 ± 0.08 M☉ |
| Radius | 4.9 ± 0.08 R☉ |
| Luminosity | 14.6 ± 0.1 L☉ |
| Surface gravity (log g) | 3.5 ± 0.1 cgs |
| Temperature | 5,098 ± 44 K |
| Metallicity [Fe/H] | −0.03 ± 0.04 dex |
| Rotational velocity (v sin i) | 2.77 ± 0.5 km/s |
| Age | 2.7 ± 0.4 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
At the age of 2.8 billion years, it has reached an evolutionary stage called a subgiant star, having a stellar classification of K0 IV. Previously it was an A-type main sequence star before using up the hydrogen at its core. It has 54% more mass than the Sun, but the outer envelope has become cooler than the Sun's as it slowly expands into a giant star.
The star is known to have two giant extrasolar planets.
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