24 Sextantis
Star in the constellation Sextans / From Wikipedia, the free encyclopedia
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.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
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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 |
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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.