Loading AI tools
WASP-69, also named Wouri, is a K-type main-sequence star 164 light-years (50 parsecs) away.[6] Its surface temperature is 4782±15 K. WASP-69 is slightly enriched in heavy elements compared to the Sun, with a metallicity Fe/H index of 0.10±0.01,[4] and is much younger than the Sun at 2 billion years. The data regarding starspot activity of WASP-69 are inconclusive, but spot coverage of the photosphere may be very high.[7]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquarius |
| Right ascension | 21h 00m 06.19682s[1] |
| Declination | −05° 05′ 40.0349″[1] |
| Apparent magnitude (V) | 9.87±0.03[2] |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | K5V[3] |
| Astrometry | |
| Radial velocity (Rv) | −9.83±0.13[1] km/s |
| Proper motion (μ) | RA: 33.778 mas/yr[1] Dec.: −93.581 mas/yr[1] |
| Parallax (π) | 19.8858 ± 0.0170 mas[1] |
| Distance | 164.0 ± 0.1 ly (50.29 ± 0.04 pc) |
| Details | |
| Mass | 0.826±0.029[2] M☉ |
| Radius | 0.813[2] R☉ |
| Surface gravity (log g) | 4.59±0.02[4] cgs |
| Temperature | 4782±15[4] K |
| Metallicity [Fe/H] | 0.10±0.01[4] dex |
| Rotation | 23.07 d[2] |
| Rotational velocity (v sin i) | 1.27±0.22[4] km/s |
| Age | 2[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Multiplicity surveys did not detect any stellar companions to WASP-69 as of 2020.[8]
The designation WASP-69 indicates that this was the 69th star found to have a planet by the Wide Angle Search for Planets.
In August 2022, this planetary system was included among 20 systems to be named by the third NameExoWorlds project.[9] The approved names, proposed by a team from Cameroon, were announced in June 2023. WASP-69 is named Wouri and its planet is named Makombé, after the Wouri and Makombé rivers.[10]
In 2013, one planet, named WASP-69b,[6] was discovered on a tight, circular orbit.[2] Its equilibrium temperature is 886 K,[11] but the measured terminator temperature is significantly higher by at least 200 K.[7] The planet is losing mass at a moderate rate of 0.5 ME per billion years, not producing a visible cometary tail,[11] although it was detected in 2024 and measured to be at least 7 times its own radius.[12]
The planetary atmosphere is extremely hazy and contains a partial cloud deck with cloud tops rising to a pressure of 100 Pa. Its composition is mostly hydrogen and helium, and sodium was also detected in low concentration.[7][13] The sodium may originate from volcanic moons, not from the planet itself.[14]
By 2021, the presence of hazes in atmosphere of WASP-69b was confirmed, along with a solar or super-solar water abundance.[15]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Makombé | 0.260±0.017 MJ | 0.04525±0.00053 | 3.8681382±0.0000017 | 0 | 86.71±0.20° | 0.945+0.007 −0.017[7] RJ |
Wikiwand in your browser!
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.
