WASP-69, also named Wouri, is a
K-type main-sequence star
A K-type main-sequence star, also referred to as a K-type dwarf or an orange dwarf, is a main-sequence (hydrogen-burning) star of spectral type K and luminosity class V. These stars are intermediate in size between red M-type main-sequence stars ...
away.
Its surface temperature is 4782
K. WASP-69 is slightly enriched in heavy elements compared to the
Sun, with a
metallicity
In astronomy, metallicity is the abundance of elements present in an object that are heavier than hydrogen and helium. Most of the normal physical matter in the Universe is either hydrogen or helium, and astronomers use the word ''"metals"'' as a ...
Fe/H index of 0.10,
[ 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
The photosphere is a star's outer shell from which light is radiated.
The term itself is derived from Ancient Greek roots, φῶς, φωτός/''phos, photos'' meaning "light" and σφαῖρα/''sphaira'' meaning "sphere", in reference to it ...
may be very high.[
Multiplicity surveys did not detect any stellar companions to WASP-69 as of 2020.
]
Nomenclature
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. 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.
Planetary system
In 2013, one planet, named WASP-69b
WASP-69, also named Wouri, is a K-type main-sequence star away. Its surface temperature is 4782 K. WASP-69 is slightly enriched in heavy elements compared to the Sun, with a metallicity Fe/H index of 0.10, and is much younger than the Su ...
,[ Its equilibrium temperature is 886 K,][ but the measured terminator temperature is significantly higher by at least 200 K.][ The planet is losing mass at a moderate rate of 0.5 per billion years, not producing a visible cometary tail,][ although it was detected in 2024 and measured to be at least 7 times its own radius.
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.][ The sodium may originate from volcanic moons, not from the planet itself.
By 2021, the presence of hazes in atmosphere of WASP-69b was confirmed, along with a solar or super-solar water abundance.]
References
{{Stars of Aquarius
Aquarius (constellation)
Planetary transit variables
K-type main-sequence stars
Planetary systems with one confirmed planet
J21000618-0505398
BD-05 5432
069
Wouri