WASP-159 is a faint star located in the southern constellation Caelum. With an apparent magnitude of 12.84, a powerful telescope is needed to see the star. The star is located 2,380 light-years (730 parsecs) based on parallax, but is drifting away with a heliocentric radial velocity of +35.16 km/s.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Caelum |
| Right ascension | 04h 32m 32.7558s[1] |
| Declination | −38° 58′ 05.953″[1] |
| Apparent magnitude (V) | 12.84±0.24[2] |
| Characteristics | |
| Spectral type | F9IV[3] |
| B−V color index | −0.21[2] |
| Astrometry | |
| Radial velocity (Rv) | +35.16±0.01[3] km/s |
| Proper motion (μ) | RA: −0.586(10) mas/yr[1] Dec.: 5.347(14) mas/yr[1] |
| Parallax (π) | 1.3723 ± 0.0098 mas[1] |
| Distance | 2,380 ± 20 ly (729 ± 5 pc) |
| Details[3] | |
| Mass | 1.41±0.12 M☉ |
| Radius | 2.11±0.10 R☉ |
| Luminosity | 4.78+0.23 −0.21[4] L☉ |
| Surface gravity (log g) | 3.94±0.04 cgs |
| Temperature | 6,120±140 K |
| Metallicity [Fe/H] | +0.22±0.12 dex |
| Rotational velocity (v sin i) | 5.7±0.4 km/s |
| Age | 3.40±0.95 Gyr |
| Other designations | |
Gaia DR2 4864759888238232320 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Properties
WASP-159 is a F-type subgiant with 1.41 times the Sun's mass, and double the Sun's radius. It radiates at 4.78 times the Sun's luminosity from its photosphere at an effective temperature of 6,120 K. WASP-159 is about 3 billion years old, and is metal-rich like many other planetary hosts.
Planetary system
In 2019, SuperWASP discovered an inflated "hot Jupiter" orbiting the star.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.55±0.08 MJ | 0.06±0.00 | 3.84±0.00 | 0 | 88.1±1.4° | 1.38±0.09 RJ |
References
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