Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Centaurus |
Right ascension | 12h 51m 55.5580s [1] |
Declination | −42° 04′ 25.095″ [1] |
Apparent magnitude (V) | 12.6 [2] |
Characteristics | |
Evolutionary stage | main-sequence star |
Spectral type | K1V [2] |
Astrometry | |
Radial velocity (Rv) | 41.25 [3] km/s |
Proper motion (μ) |
RA: −49.875
[3]
mas/
yr Dec.: 4.963 [3] mas/ yr |
Parallax (π) | 5.6209 ± 0.0153 mas [3] |
Distance | 580 ± 2
ly (177.9 ± 0.5 pc) |
Details [4] | |
Mass | 0.881+0.086 −0.081 M☉ |
Radius | 0.850±0.035 R☉ |
Surface gravity (log g) | 4.50±0.18 [5] cgs |
Temperature | 5315±79 [2] 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 | |
Database references | |
SIMBAD | data |
WASP-42 is a
K-type main-sequence star. Its surface temperature is 5315±79
K.
[6] 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.
[4] The star does exhibit
starspot activity as is typical for its spectral class.
[2]
Multiplicity surveys did not detect any stellar companions to WASP-42 in 2017. [7]
In 2012, one planet, named WASP-42b, was discovered [8] on a tight, mildly eccentric orbit. [4] The planetary equilibrium temperature is 1021±19 K. [2]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 0.501±0.034 MJ | 0.0548+0.0017 −0.0018 |
4.9816872±0.0000073 | 0.062+0.013 −0.011 |
88.30+0.26 −0.23 ° |
1.063±0.051 RJ |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Centaurus |
Right ascension | 12h 51m 55.5580s [1] |
Declination | −42° 04′ 25.095″ [1] |
Apparent magnitude (V) | 12.6 [2] |
Characteristics | |
Evolutionary stage | main-sequence star |
Spectral type | K1V [2] |
Astrometry | |
Radial velocity (Rv) | 41.25 [3] km/s |
Proper motion (μ) |
RA: −49.875
[3]
mas/
yr Dec.: 4.963 [3] mas/ yr |
Parallax (π) | 5.6209 ± 0.0153 mas [3] |
Distance | 580 ± 2
ly (177.9 ± 0.5 pc) |
Details [4] | |
Mass | 0.881+0.086 −0.081 M☉ |
Radius | 0.850±0.035 R☉ |
Surface gravity (log g) | 4.50±0.18 [5] cgs |
Temperature | 5315±79 [2] 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 | |
Database references | |
SIMBAD | data |
WASP-42 is a
K-type main-sequence star. Its surface temperature is 5315±79
K.
[6] 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.
[4] The star does exhibit
starspot activity as is typical for its spectral class.
[2]
Multiplicity surveys did not detect any stellar companions to WASP-42 in 2017. [7]
In 2012, one planet, named WASP-42b, was discovered [8] on a tight, mildly eccentric orbit. [4] The planetary equilibrium temperature is 1021±19 K. [2]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 0.501±0.034 MJ | 0.0548+0.0017 −0.0018 |
4.9816872±0.0000073 | 0.062+0.013 −0.011 |
88.30+0.26 −0.23 ° |
1.063±0.051 RJ |