WASP-26
Yellow main sequence star in the constellation Cetus
From Wikipedia, the free encyclopedia
WASP-26 is a G-type subgiant star about 824 light-years away in the constellation of Cetus.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus[1] |
| Right ascension | 00h 18m 24.7008s[2] |
| Declination | −15° 16′ 02.276″[2] |
| Apparent magnitude (V) | 11.30[3] |
| Characteristics | |
| Evolutionary stage | subgiant[4][2] |
| Spectral type | G0[5] |
| B−V color index | 0.32[citation needed] |
| J−H color index | 0.246[citation needed] |
| J−K color index | 0.411[citation needed] |
| Astrometry | |
| Radial velocity (Rv) | 9.07±0.41[2] km/s |
| Proper motion (μ) | RA: +27.416[2] mas/yr Dec.: −24.524[2] mas/yr |
| Parallax (π) | 3.9574±0.0247 mas[2] |
| Distance | 824 ± 5 ly (253 ± 2 pc) |
| Details[6] | |
| Mass | 1.095±0.043 M☉ |
| Radius | 1.284±0.035 R☉ |
| Luminosity | 1.84[2] L☉ |
| Surface gravity (log g) | 4.260±0.022 cgs |
| Temperature | 6015±55 K |
| Metallicity [Fe/H] | −0.02±0.09 dex |
| Rotational velocity (v sin i) | 3.9±0.4[7] km/s |
| Age | 4.0+5.9 −4.0 Gyr |
| Other designations | |
| TOI-2386, TIC 32487566, WASP-26, TYC 5839-876-1, 2MASS J00182469-1516022, DENIS J001824.6-151601[8] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Star characteristics
WASP-26 is an old star close to leaving the main sequence and is part of a wide binary. The binary's projected separation is 3800 astronomical units, its companion star being a K-type star with an effective temperature of 4600K and a visual magnitude of 13.6.[5] WASP-26 produces a large amount of ultraviolet light due to frequent flares, with an average ultraviolet flux close to the F7 class main-sequence star WASP-1.[9]
Planetary system
The hot Jupiter class planet WASP-26b was discovered around WASP-26 in 2010.[5] The planet would have an equilibrium temperature of 1660±40 K, but measured temperatures are slightly higher at 1775K and no noticeable difference exists between the day-side and the night-side of the planet.[10] A 2011 study using the Rossiter-McLaughlin effect failed to determine the inclination of the planetary orbit to the equatorial plane of the parent star due to high stellar noise,[7] but an initial constraint of -34+36
−26° was published in 2012.[11]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.038+0.020 −0.021 MJ |
0.03997+0.00035 −0.00036 |
2.7565972(19) | <0.0039 | 82.83±0.27[6]° | 1.216±0.047[6] RJ |