WASP-26
Yellow main sequence star in the constellation Cetus From Wikipedia, the free encyclopedia
WASP-26 is a yellow main sequence star in the constellation of Cetus.
| Observation data Epoch J2000 Equinox | |
|---|---|
| Constellation | Cetus |
| Right ascension | 00h 18m 24.7008s[1] |
| Declination | −15° 16′ 02.2775″[1] |
| Apparent magnitude (V) | 11.30[2] |
| Characteristics | |
| Evolutionary stage | main sequence star |
| Spectral type | G0V |
| B−V color index | 0.32 |
| J−H color index | 0.246 |
| J−K color index | 0.411 |
| Astrometry | |
| Radial velocity (Rv) | 9.60±0.54[1] km/s |
| Proper motion (μ) | RA: 27.416±0.022[1] mas/yr Dec.: -24.454±0.021[1] mas/yr |
| Parallax (π) | 3.9574±0.0247 mas[1] |
| Distance | 824 ± 5 ly (253 ± 2 pc) |
| Details[3][4][5][6] | |
| Mass | 1.09±0.01 M☉ |
| Radius | 1.284±0.035 R☉ |
| Luminosity | 1.26 L☉ |
| Surface gravity (log g) | 4.40±0.01 cgs |
| Temperature | 6015±55 K |
| Metallicity [Fe/H] | -0.02±0.09 dex |
| Rotational velocity (v sin i) | 3.9±0.4 km/s |
| Age | 6±2 Gyr |
| Other designations | |
| WASP-26, TYC 5839-876-1, DENIS J001824.6-151601, 2MASS J00182469-1516022, Gaia DR2 2416782701664155008[7] | |
| Database references | |
| SIMBAD | 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 red dwarf with an effective temperature of 4600K and a visual magnitude of 13.6.[3] 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.[8]
Planetary system
The "Hot Jupiter" class planet WASP-26b was discovered around WASP-26 in 2010.[3] 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.[9] 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,[5] but an initial constraint of -34+36
−26° was published in 2012.[10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 1.02±0.03 MJ | 0.0400±0.0003 | 2.75660±0.00001 | 0 | 82.5±0.5° | 1.216±0.047 RJ |
References
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