WASP-41

WASP-41 is a G-type main-sequence star. Its surface temperature is 5450±150 K. WASP-41 is similar to the Sun in its concentration of heavy elements, with a metallicity Fe/H index of −0.080±0.090,^[4] but is much younger at an age of 2.289±0.077 billion years.^[6] The star does exhibit strong starspot activity, with spots covering 3% of the stellar surface.^[5]

WASP-41

Observation data Epoch J2000      Equinox J2000
Constellation	Centaurus
Right ascension	12h 42m 28.4950s[1]
Declination	−30° 38′ 23.529″[1]
Apparent magnitude (V)	11.6[2]
Characteristics
Evolutionary stage	main-sequence star
Spectral type	G8V[3]
Astrometry
Radial velocity (Rv)	4.153[1] km/s
Proper motion (μ)	RA: 14.878[1] mas/yr Dec.: 11.988[1] mas/yr
Parallax (π)	6.1193±0.0203 mas[1]
Distance	533 ± 2 ly (163.4 ± 0.5 pc)
Details
Mass	0.930±0.030[4] M☉
Radius	0.900±0.050[4] R☉
Luminosity	0.65[1] L☉
Surface gravity (log g)	4.48[1] cgs
Temperature	5,450±150[4] K
Metallicity [Fe/H]	−0.080±0.090[4] dex
Rotation	18.4 d[3]
Rotational velocity (v sin i)	1.50±0.05[5] km/s
Age	2.289±0.077[6] Gyr
Other designations
CD−29 98732, TYC 7247-587-1, GSC 07247-00587, 2MASS J12422849-3038235[7]
Database references
SIMBAD	9873 data

Multiplicity surveys did not detect any stellar companions as of 2017.^[8]

Planetary system

In 2012, one planet, named WASP-41b, was discovered on a tight, circular orbit.^[3] The transmission spectrum taken in 2017 was gray and featureless. No atmospheric constituents could be distinguished.^[9] The planetary orbit of WASP-41b is slightly misaligned with the equatorial plane of the star, at a misalignment angle of 9.15^+2.85
_−2.62°.^[5] Planetary equilibrium temperature is 1242±12 K.^[2]

Another planet, WASP-41c, was discovered in 2015.^[10] The planets are too far apart to significantly affect each other's orbits.^[11] The planetary equilibrium temperature of WASP-41c is 247±5 K.^[10]

The WASP-41 planetary system^[4]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.941+0.065 −0.064 MJ	0.04022±0.00044	3.0524010±0.000004	<0.12	87.700±0.080°	1.200±0.060 RJ
c[12]	>3.2±0.20 MJ	1.36±0.04	421±2	0.294±0.024	>70°	—