WASP-159
Star in the constellation Caelum
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WASP-159 is a star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 12.84,[3] making it readily visible in telescopes with an aperture of at least four inches, but not to the naked eye. The star is located relatively far at a distance of 2,380 light-years based on recent parallax measurements from the Gaia spacecraft,[2] but it is receding with a heliocentric radial velocity of 35.2 km/s.[4]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Caelum[1] |
| Right ascension | 04h 32m 32.75581s[2] |
| Declination | −38° 58′ 05.9529″[2] |
| Apparent magnitude (V) | 12.84±0.24[3] |
| Characteristics | |
| Evolutionary stage | subgiant[2] |
| Spectral type | F9[4] |
| B−V color index | −0.21[3] |
| Astrometry | |
| Radial velocity (Rv) | 35.16±0.01[4] km/s |
| Proper motion (μ) | RA: −0.586 mas/yr[2] Dec.: +5.347 mas/yr[2] |
| Parallax (π) | 1.3723±0.0098 mas[2] |
| Distance | 2,380 ± 20 ly (729 ± 5 pc) |
| Details[4] | |
| Mass | 1.41±0.12 M☉ |
| Radius | 2.11±0.10 R☉ |
| Luminosity | 4.674+0.064 −0.053[2] 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 | |
| TOI-1903, TIC 77156657, WASP-159, TYC 7579-251-1[5] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
WASP-159 has a stellar classification of F9 indicating that it is a late F-type star.[4] It appears to be ceasing hydrogen fusion at its core and evolving towards the red giant branch.[4] It has 1.41 times the Sun's mass and 2.11 times the radius of the Sun.[4] It radiates 4.674 times the luminosity of the Sun[2] from its photosphere at an effective temperature of 6,120 K,[4] giving it a whitish-yellow hue when viewed in a telescope. WASP-159 is metal enriched with an iron abundance 166% that of the Sun, and it is estimated to be 3.4 billion years old.[4]
Planetary system
In 2019, SuperWASP discovered a transiting exoplanet orbiting the star after spectral and radial velocity observations. WASP-159b is a "bloated" hot Jupiter that takes roughly 3.8 days to revolve around its host star in a circular orbit.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.55±0.08 MJ | 0.0538±0.0015 | 3.8404008+0.0000063 −0.0000064 |
0.00 (fixed) | 88.1±1.4° | 1.38±0.09 RJ |