WASP-45
K-type main sequence star in the constellation of Sculptor
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WASP-45 is a K-type main-sequence star about 701 light-years (215 parsecs) away. The star's age cannot be well constrained, but it is probably older than the Sun. Yet WASP-45 is enriched in heavy elements compared to the Sun, having 240% of the solar abundance.[5] WASP-45 has low ultraviolet emission, therefore it is suspected to have a low starspot activity,[7] although chromospheric activity was reported elsewhere.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sculptor[1] |
| Right ascension | 00h 20m 56.99413s[2] |
| Declination | −35° 59′ 53.7466″[2] |
| Apparent magnitude (V) | 11.8[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | K2V[4] |
| Astrometry | |
| Radial velocity (Rv) | 4.71±0.33[2] km/s |
| Proper motion (μ) | RA: 52.831 mas/yr[2] Dec.: −46.940 mas/yr[2] |
| Parallax (π) | 4.6520±0.0226 mas[2] |
| Distance | 701 ± 3 ly (215 ± 1 pc) |
| Details[5] | |
| Mass | 0.932+0.045 −0.046 M☉ |
| Radius | 0.891±0.013 R☉ |
| Luminosity | 0.510±0.013 L☉ |
| Surface gravity (log g) | 4.508+0.023 −0.025 cgs |
| Temperature | 5167±29 K |
| Metallicity [Fe/H] | 0.388+0.090 −0.10 dex |
| Rotational velocity (v sin i) | 2.3±0.7 km/s |
| Age | 5.4+4.7 −3.5 Gyr |
| Other designations | |
| TOI-229, TIC 120610833, WASP-45, TYC 6996-583-1, GSC 06996-00583, 2MASS J00205699-3559537[6] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
There is a companion star at a separation of 4.4 arcseconds, corresponding to 929 AU. The companion is estimated to have a mass of 0.157 M☉ and a temperature of 3,154 K. Although it shares a similar distance and common proper motion with the primary star, its relative space velocity appears to be high enough that the pair are not gravitationally bound.[8]
Planetary system
In 2011 a transiting hot Jupiter planet, WASP-45b, was detected.[4] The planet equilibrium temperature is 1,170±24 K. No Rayleigh scattering was detected in the planetary atmosphere, implying the existence of hazes or a high cloud deck.[9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.018+0.046 −0.045 MJ |
0.04089+0.00065 −0.00069 |
3.1260876(35)[10] | <0.043[10] | 84.686±0.098° | 0.978+0.026 −0.024 RJ |