| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Puppis[1] |
| Right ascension | 08h 25m 21.08369s[2] |
| Declination | −11° 30′ 03.5522″[2] |
| Apparent magnitude (V) | 11.08[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | F6[4] |
| Astrometry | |
| Radial velocity (Rv) | 38.72±0.41[2] km/s |
| Proper motion (μ) | RA: -5.431 mas/yr[2] Dec.: -0.496 mas/yr[2] |
| Parallax (π) | 2.8078±0.0158 mas[2] |
| Distance | 1,162 ± 7 ly (356 ± 2 pc) |
| Details[4] | |
| Mass | 1.39±0.14 M☉ |
| Radius | 1.712+0.083 −0.072 R☉ |
| Luminosity | 4.44+0.56 −0.48 L☉ |
| Surface gravity (log g) | 4.111+0.023 −0.033 cgs |
| Temperature | 6400±100 K |
| Metallicity [Fe/H] | +0.16±0.09 dex |
| Rotational velocity (v sin i) | 18±0.8 km/s |
| Other designations | |
| Tislit, BD−11 2350, TOI-1912, TIC 50712784, WASP-161, TYC 5435-1109-1[5] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
WASP-161, also named Tislit, is an F-type main-sequence star about 1,162 light-years (356 parsecs) away in the constellation Puppis. With an apparent magnitude of 11.1, it is much too faint to be visible to the naked eye. It hosts one known exoplanet.
Nomenclature
The designation WASP-161 comes from the Wide Angle Search for Planets.
This was one of the systems selected to be named in the 2019 NameExoWorlds campaign during the 100th anniversary of the IAU, which assigned each country a star and planet to be named. This system was assigned to Morocco; it was chosen because it hosts the first exoplanet with a discovery team led by a Moroccan astronomer.[6] The approved names were Tislit for the star and Isli for the planet; they are named after the Tislit and Isli lakes in the Atlas Mountains of Morocco, near Imilchil. The names mean bride and groom in the Amazigh language, in reference to a heartbroken couple of local legend.[7][8]
Planetary system
The planet WASP-161b, later named Isli, is a massive hot Jupiter, discovered using the transit method as part of the Wide Angle Search for Planets (WASP).[4] The discovery team, led by Khalid Barkaoui of Cadi Ayyad University, used other telescopes, including TRAPPIST-North at the Oukaïmeden Observatory, TRAPPIST-South, and SPECULOOS-South, to confirm the planet initially detected by WASP.[6] The discovery was announced in 2018 along with two other planets, around the stars WASP-163 and WASP-170.[4]
A 2022 study reported evidence for transit-timing variations of WASP-161b, possibly due to orbital decay or precession,[9][10] but this was not confirmed by a subsequent study in 2023.[11]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Isli | 2.49±0.21 MJ | 0.0673±0.0023 | 5.4060425(48) | — | 89.01+0.69 −1.0° |
1.143+0.065 −0.058 RJ |
References
- ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
- ^ a b c d e Barkaoui, K.; Burdanov, A.; et al. (February 2019). "Discovery of Three New Transiting Hot Jupiters: WASP-161 b, WASP-163 b, and WASP-170 b". The Astronomical Journal. 157 (2): 43. arXiv:1807.06548. Bibcode:2019AJ....157...43B. doi:10.3847/1538-3881/aaf422.
- ^ "WASP-161". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 June 2025.
- ^ a b "WASP-161". WASP Planets. 14 July 2019. Retrieved 24 June 2025.
- ^ "Approved names". NameExoWorlds. IAU. Retrieved 24 June 2025.
- ^ "Morocco". NameExoWorlds. IAU. Retrieved 24 June 2025.
- ^ Yang, Fan; Chary, Ranga-Ram (December 2022). "Tentative Evidence for Transit-timing Variations of WASP-161b". The Astronomical Journal. 164 (6): 259. arXiv:2204.12306. Bibcode:2022AJ....164..259Y. doi:10.3847/1538-3881/ac9e50.
- ^ Shan, Su-Su; Yang, Fan; et al. (February 2023). "TESS Timings of 31 Hot Jupiters with Ephemeris Uncertainties". The Astrophysical Journal Supplement Series. 264 (2): 37. arXiv:2111.06678. Bibcode:2023ApJS..264...37S. doi:10.3847/1538-4365/aca65f.
- ^ Maciejewski, G.; Sierzputowska, J.; Golonka, J. (November 2023). "Search for Planets in Hot Jupiter Systems with Multi-Sector TESS Photometry. IV. Null Detections in 12 Systems". Acta Astronomica. 73 (2): 159–177. arXiv:2312.03319. Bibcode:2023AcA....73..159M. doi:10.32023/0001-5237/73.2.3.
