KELT-24 (HD 93148, MASCARA-3) is a single star in the constellation Ursa Major at a distance of approximately 316 light-years (about 96.8 parsecs) from Sun. The apparent magnitude of the star is +8.33m. The star's age is estimated to be about 1.6 billion years.[2][3][4] As an F-type main-sequence star, it is similar to the Sun, but slightly hotter and more luminous.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 10h 47m 38.35063s[1] |
| Declination | +71° 39′ 21.1525″[1] |
| Characteristics | |
| Evolutionary stage | main sequence star |
| Spectral type | F7V |
| Variable type | planetary transit |
| Astrometry | |
| Radial velocity (Rv) | −5.54±0.24[1] km/s |
| Proper motion (μ) | RA: −56.061(17) mas/yr[1] Dec.: −34.526(21) mas/yr[1] |
| Parallax (π) | 10.3218 ± 0.0180 mas[1] |
| Distance | 316.0 ± 0.6 ly (96.9 ± 0.2 pc) |
| Details | |
| Mass | 1.30 M☉ |
| Radius | 1.52 R☉ |
| Luminosity | 0.565 L☉ |
| Temperature | 6415 K |
| Metallicity [Fe/H] | -0.090 Fe dex |
| Age | 2.8 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Nomenclature
This star was first catalogued in the Henry Draper Catalogue as HD 93148. The Henry Draper Catalogue gave stars visible to the naked eye in suitable conditions a designation, indicating that this star can be seen with the naked eye. But in 2019, the Multi-site All-Sky Camera and the Kilodegree Extremely Little Telescope announced the discovery of the exoplanet KELT-24b/MASCARA-3b around this star. Thus, it is most commonly known as KELT-24, although the star is sometimes catalogued as MASCARA-3.
Characteristics
KELT-24 is a yellow-white star with a spectral class of F5 or F7. Its mass is about 1.4 M☉, its radius is about 1.555 R☉, and its luminosity is about 3.466 L☉. Its effective temperature is about 6437 K.
Planetary system
In 2019, the discovery of the Hot Jupiter type planet KELT-24b/MASCARA-3b was announced by the Multi-site All-Sky CAmeRA and the Kilodegree Extremely Little Telescope. TESS data confirmed that no additional companions are orbiting this star.[5][6] Since this discovery, the system is now called KELT-24 or MASCARA-3.
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 5.18 MJ | 0.06969 | 5.6 | 0.08 | 83.11° | 1.272 RJ |