| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sextans |
| Right ascension | 10h 23m 28.3694s[1] |
| Declination | –00° 54′ 08.0772″[1] |
| Apparent magnitude (V) | 6.61 ± 0.04[2] |
| Characteristics | |
| Spectral type | K0 IV[3] |
| B−V color index | 0.92 ± 0.01[2] |
| Astrometry | |
| Radial velocity (Rv) | 7.08 ± 0.16[4] km/s |
| Proper motion (μ) | RA: 65.220±0.167[1] mas/yr Dec.: −36.272±0.244[1] mas/yr |
| Parallax (π) | 13.8488 ± 0.1298 mas[1] |
| Distance | 236 ± 2 ly (72.2 ± 0.7 pc) |
| Absolute magnitude (MV) | 2.17 ± 0.06[2] |
| Details[2] | |
| 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 |
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,[2] this star can only be viewed from rural skies under good seeing conditions.
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.[3] 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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