WASP-69

Short description: Star in the constellation Aquarius

WASP-69 / Wouri  Observation data
Equinox J2000.0]] (ICRS)

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[1] mas/yr
Dec.: −93.581[1] mas/yr
Parallax (π)| 19.8858 ± 0.0170[1] mas
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

Wouri, BD−05 5432, TYC 5200-1560-1, GSC 05200-01560, 2MASS J21000618-0505398[5]

Database references
SIMBAD| data

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]

Multiplicity surveys did not detect any stellar companions to WASP-69 as of 2020.[8]

## 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.[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]

## Planetary system

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 M⊕ per billion years, not producing a visible cometary tail.[11]

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][12] The sodium may originate from volcanic moons, not from the planet itself.[13]

By 2021, the presence of hazes in atmosphere of WASP-69b was confirmed, along with a solar or super-solar water abundance.[14]

The WASP-69 planetary system[2] 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

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Anderson, D. R.; Collier Cameron, A.; Delrez, L.; Doyle, A. P.; Faedi, F.; Fumel, A.; Gillon, M.; Gómez Maqueo Chew, Y. et al. (2013), Three sub-Jupiter-mass planets: WASP-69b & WASP-84b transit active K dwarfs and WASP-70Ab transits the evolved primary of a G4+K3 binary, doi:10.1093/mnras/stu1737
3. ↑ France, Kevin; Arulanantham, Nicole; Fossati, Luca; Lanza, Antonino F.; Loyd, R. O. Parke; Redfield, Seth; Schneider, P. Christian (2018), "Far-ultraviolet Activity Levels of F, G, K, and M Dwarf Exoplanet Host Stars", The Astrophysical Journal Supplement Series 239 (1): 16, doi:10.3847/1538-4365/aae1a3, Bibcode: 2018ApJS..239...16F
4. ↑ 4.0 4.1 4.2 4.3 4.4 Gill, S.; Maxted, P. F. L.; Smalley, B. (2018), "The atmospheric parameters of FGK stars using wavelet analysis of CORALIE spectra", Astronomy & Astrophysics 612: A111, doi:10.1051/0004-6361/201731954, Bibcode: 2018A&A...612A.111G
5. ↑ "BD-05 5432". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=BD-05+5432.
6. ↑ 6.0 6.1 Andrews, Robin George (12 January 2024). "This Distant Planet Has a 350,000-Mile-Long Comet-Like Tail - The stream of helium trailing WASP-69b, a “Hot Jupiter,” allows astronomers to study how planets lose their atmospheres.". The New York Times. Archived from the original on 12 January 2024. https://archive.today/20240112135452/https://www.nytimes.com/2024/01/12/science/wasp-69b-tail-planet.html. Retrieved 12 January 2024.
7. ↑ 7.0 7.1 7.2 7.3 Murgas, F.; Chen, G.; Nortmann, L.; Pallé, E.; Nowak, G. (2020), "The GTC exoplanet transit spectroscopy survey XI. Possible detection of Rayleigh scattering in the atmosphere of the Saturn-mass planet WASP-69b", Astronomy & Astrophysics A158: 641, doi:10.1051/0004-6361/202038161, Bibcode: 2020A&A...641A.158M
8. ↑ Bohn, A. J.; Southworth, J.; Ginski, C.; Kenworthy, M. A.; Maxted, P. F. L.; Evans, D. F. (2020), "A multiplicity study of transiting exoplanet host stars. I. High-contrast imaging with VLT/SPHERE", Astronomy & Astrophysics 635: A73, doi:10.1051/0004-6361/201937127, Bibcode: 2020A&A...635A..73B
9. ↑ "List of ExoWorlds 2022". IAU. 8 August 2022. https://www.nameexoworlds.iau.org/2022exoworlds.
10. ↑ "2022 Approved Names". IAU. https://www.nameexoworlds.iau.org/2022approved-names.
11. ↑ 11.0 11.1 Wang, Lile; Dai, Fei (2021), "Metastable Helium Absorptions with 3D Hydrodynamics and Self-consistent Photochemistry. I. WASP-69b, Dimensionality, X-Ray and UV Flux Level, Spectral Types, and Flares", The Astrophysical Journal 914 (2): 98, doi:10.3847/1538-4357/abf1ee, Bibcode: 2021ApJ...914...98W
12. ↑ Casasayas-Barris, N.; Palle, E.; Nowak, G.; Yan, F.; Nortmann, L.; Murgas, F. (2017), "Detection of sodium in the atmosphere of WASP-69b", Astronomy & Astrophysics 608: A135, doi:10.1051/0004-6361/201731956, Bibcode: 2017A&A...608A.135C
13. ↑ Oza, Apurva V.; Johnson, Robert E.; Lellouch, Emmanuel; Schmidt, Carl; Schneider, Nick; Huang, Chenliang; Gamborino, Diana; Gebek, Andrea et al. (2019), "Sodium and Potassium Signatures of Volcanic Satellites Orbiting Close-in Gas Giant Exoplanets", The Astrophysical Journal 885 (2): 168, doi:10.3847/1538-4357/ab40cc, Bibcode: 2019ApJ...885..168O
14. ↑ Khalafinejad, S. et al. (2021), "Probing the atmosphere of WASP-69 b with low- and high-resolution transmission spectroscopy", Astronomy & Astrophysics 656: A142, doi:10.1051/0004-6361/202141191, Bibcode: 2021A&A...656A.142K

Coordinates:  21h 00m 06.1969s, −05° 05′ 40.0370″

* v
* t
* e

Constellation of Aquarius

* Aquarius in Chinese astronomy
* Aquarius Stream
* List of stars in Aquarius

Stars|

| Bayer|

* α
* β
* γ
* δ
* ε
* ζ
* η
* θ
* ι
* κ
* λ
* μ
* ν
* ξ
* ο
* π
* ρ
* σ
* τ1
* τ2
* υ
* φ
* χ
* ψ2
* ψ3
* ω1
* ω2

|

Flamsteed|

* 1
* 3
* 4
* 5
* 7
* 8
* 9
* 10
* 11
* 12
* 14
* 15
* 16
* 17
* 18
* 19
* 20
* 21
* 24
* 25
* 26
* 28
* 29
* 30
* 32
* 35
* 36
* 37
* 38
* 39
* 40
* 41
* 42
* 44
* 45
* 47
* 49
* 50
* 51
* 53
* 54
* 56
* 58
* 60
* 61
* 64
* 65
* 66
* 67
* 68
* 70
* 72
* 74
* 75
* 77
* 78
* 81
* 82
* 83
* 84
* 85
* 86
* 87
* 88
* 89
* 91
* 94
* 96
* 97
* 98
* 99
* 100
* 101
* 103
* 104
* 106
* 107
* 108

Variable|

* R
* U
* AE
* DV
* EW
* EZ
* FO
* HK
* HU
* IZ
* LP

HD|

* 199442
* 200375
* 202259
* 205765
* 208177
* 210277
* 210434
* 211392
* 211575
* 213429
* 214448
* 214810
* 215114
* 215152
* 216718
* 218061
* 219279
* 220035
* 220466
* 220689
* 220766
* 221148
* 222093
* 222582
* 223311

Other|

* 2MASS J21392676+0220226
* BD−22 5866
* Fomalhaut C
* Gliese 849
* Gliese 876
* K2-28
* K2-72
* K2-138
* LS IV-14 116
* Sneden's Star
* TRAPPIST-1
* WASP-6
* WASP-47

| Exoplanets|

* 91 Aquarii b
* Gliese 849 b
* Gliese 876 b
* c
* d
* e
* HD 206610 b
* HD 210277 b
* HD 212771 b
* HD 222582 b
* K2-21b
* c
* K2-72b
* c
* d
* e
* K2-138b
* TRAPPIST-1b
* c
* d
* e
* f
* g
* h
* WASP-6b

|

| Star clusters|

* Messier 2
* Messier 72
* Messier 73

|

| Nebulae|

* Helix
* Saturn

|

Galaxies|

| NGC|

* 6975
* 7001
* 7010
* 7047
* 7051
* 7065
* 7069
* 7077
* 7081
* 7184
* 7252
* 7257
* 7301
* 7302
* 7600
* 7606
* 7723
* 7727
* 7759

|

Other|

* Aquarius Dwarf
* Lyman-alpha blob 1
* SMM J2135-0102
* WISE J224607.57−052635.0

| Galaxy clusters|

* Abell 2597
* XMMXCS 2215-1738

|

| Astronomical events|

* SN 2213-1745

|

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