WASP-42
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 12h 51m 55.5581s |
| Declination | −42° 04′ 25.096″ |
| Apparent magnitude (V) | 12.6 |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | K1V |
| Astrometry | |
| Radial velocity (Rv) | −4.22±0.41 km/s |
| Proper motion (μ) | RA: −49.875 mas/yr Dec.: 4.963 mas/yr |
| Parallax (π) | 5.6209±0.0153 mas |
| Distance | 580 ± 2 ly (177.9 ± 0.5 pc) |
| Details | |
| Mass | 0.881+0.086 −0.081 M☉ |
| Radius | 0.850±0.035 R☉ |
| Luminosity | 0.48 L☉ |
| Surface gravity (log g) | 4.52 cgs |
| Temperature | 5,259 K |
| Metallicity [Fe/H] | 0.05±0.13 dex |
| Rotational velocity (v sin i) | 2.70±0.40 km/s |
| Age | 11.3+1.5 −4.8 Gyr |
| Other designations | |
| TOI-769, TIC 248075138, WASP-42, 2MASS J12515557-4204249 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
WASP-42 is a K-type main-sequence star about 580 light-years away in the constellation Centaurus. Its surface temperature is 5315±79 K. WASP-42 is similar to the Sun in concentration of heavy elements, with metallicity ([Fe/H]) of 0.05±0.13, and is much older than the Sun at 11.3+1.5
−4.8 billion years. The star does exhibit starspot activity as is typical for its spectral class.
Multiplicity surveys did not detect any stellar companions to WASP-42 in 2017.