HAT-P-27
HAT-P-27, also known as WASP-40, is the primary of a binary star system about 650 light-years away. It is a G-type main-sequence star. The star's age is similar to the Sun's at 4.4 billion years. HAT-P-27 is enriched in heavy elements, having a 195% concentration of iron compared to the Sun.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 14h 51m 04.1870s |
| Declination | +05° 56′ 50.5482″ |
| Apparent magnitude (V) | 12.214 |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | G8 |
| Astrometry | |
| Radial velocity (Rv) | -15.901 km/s |
| Proper motion (μ) | RA: -28.621 mas/yr Dec.: -2.757 mas/yr |
| Parallax (π) | 4.9922 ± 0.0360 mas |
| Distance | 653 ± 5 ly (200 ± 1 pc) |
| Orbit | |
| Primary | HAT-P-27 |
| Companion | HAT-P-27 B |
| Semi-major axis (a) | 0.656±0.021" (131 AU) |
| Details | |
| Mass | 0.945±0.035 M☉ |
| Radius | 0.898+0.054 −0.039 R☉ |
| Luminosity | 0.57+0.09 −0.07 L☉ |
| Surface gravity (log g) | 4.51±0.04 cgs |
| Temperature | 5300±90 K |
| Metallicity [Fe/H] | 0.29±0.10 dex |
| Rotation | 0.4±0.4 |
| Rotational velocity (v sin i) | 0.6+0.7 −0.4 km/s |
| Age | 4.4+3.8 −2.6 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The very dim stellar companion was detected in 2015 at a projected separation of 0.656″ and proven to be physically bound to the system in 2016.
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