KELT-20
Star in Cygnus
From Wikipedia, the free encyclopedia
KELT-20, also known as MASCARA-2, is an A2 main sequence star in the constellation of Cygnus, about 447 light years away.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 38m 38.735s[2] |
| Declination | +31° 31′ 09.22″[2] |
| Apparent magnitude (V) | 7.58[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A2V[4] |
| Variable type | planetary transit |
| Astrometry | |
| Proper motion (μ) | RA: 3.096±0.068 mas/yr[2] Dec.: −6.157±0.075 mas/yr[2] |
| Parallax (π) | 7.3015±0.0433 mas[2] |
| Distance | 447 ± 3 ly (137.0 ± 0.8 pc) |
| Absolute magnitude (MV) | +2.30[1] |
| Details | |
| Mass | 2.3[5] M☉ |
| Radius | 1.6[5] R☉ |
| Luminosity | 15.7[5] L☉ |
| Surface gravity (log g) | 4.38[5] cgs |
| Temperature | 9,032[5] K |
| Metallicity [Fe/H] | −0.02±0.07[6] dex |
| Age | 58±5[7] Myr |
| Other designations | |
| HD 185603, HIP 96618, MASCARA-2, KELT-20 | |
| Database references | |
| SIMBAD | data |
Nomenclature
KELT-20 is the star's KELT designation. It is also designated as MASCARA-2 meaning that it is the second star observed by the MASCARA exoplanet search program. Its Henry Draper Catalogue designation is HD 185603, and its Hipparcos designation is HIP 96618.
Planetary system
In 2017, the discovery of the planet KELT-20b was announced.[8][9][10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 3.382 MJ | 0.05 | 3.6127647 | — | 86.12° | 1.741 RJ |
