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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.

WASP-159

Observation data Epoch J2000      Equinox J2000
Constellation	Caelum
Right ascension	04h 32m 32.76s[1]
Declination	−38° 58′ 05.95″[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: −0.767±0.034 mas/yr[1] Dec.: +5.443±0.042 mas/yr[1]
Parallax (π)	1.3689 ± 0.0206 mas[1]
Distance	2,380 ± 40 ly (730 ± 10 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
Extrasolar Planets Encyclopaedia	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]

The WASP-159 planetary system[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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