14h51m04.1870s, +05° 56′ 50.5482″| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 14h51m 04.1870s[1] |
| Declination | +05° 56′ 50.549″[1] |
| Apparent magnitude (V) | 12.214[2] |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | G8 |
| Astrometry | |
| Radial velocity (Rv) | -15.901[3] km/s |
| Proper motion (μ) | RA: −28.610(19) mas/yr[1] Dec.: −2.774(19) mas/yr[1] |
| Parallax (π) | 4.952 ± 0.0169 mas[1] |
| Distance | 659 ± 2 ly (201.9 ± 0.7 pc) |
| Orbit[4] | |
| Primary | HAT-P-27 |
| Companion | HAT-P-27 B |
| Semi-major axis (a) | 0.656±0.021" (131 AU) |
| Details[2] | |
| 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[5] km/s |
| Age | 4.4+3.8 −2.6 Gyr |
| Other designations | |
HAT-P-27, Gaia DR2 1159336403336463872, WASP-40, GSC 00333-00351, 2MASS J14510418+0556505[3] | |
| Database references | |
| SIMBAD | data |
HAT-P-27, also known as WASP-40, is the primary of a binary star system about 659 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.[2] HAT-P-27 is enriched in heavy elements, having a 195% concentration of iron compared to the Sun.
The very dim stellar companion was detected in 2015 at a projected separation of 0.656″[4] and proven to be physically bound to the system in 2016.[6]
In 2011 a transiting hot Jupiter type planet b was detected in a mildly eccentric orbit. The planetary equilibrium temperature is 1207±41K.[2] The survey in 2013 failed to find any Rossiter-McLaughlin effect and therefore was unable to constrain the inclination of planetary orbit to the equatorial plane of the parent star.[5] No orbital decay was detected as in 2018, despite the close proximity of the planet to the star.[7]
The presence of an additional planet in the system has been suspected since 2015.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.660±0.033 MJ | 0.0403±0.0005 | 3.039586±0.000012 | 0.078±0.047 | 85.0±0.2[5]° | 1.038+0.077 −0.058 RJ |
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