| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Caelum1 |
| Right ascension | 04h 32m 32.75581s2 |
| Declination | −38° 58′ 05.9529″2 |
| Apparent magnitude (V) | 12.84±0.243 |
| Characteristics | |
| Evolutionary stage | subgiant2 |
| Spectral type | F94 |
| B−V color index | −0.213 |
| Astrometry | |
| Radial velocity (Rv) | 35.16±0.014 km/s |
| Proper motion (μ) | RA: −0.586 mas/yr2 Dec.: +5.347 mas/yr2 |
| Parallax (π) | 1.3723±0.0098 mas2 |
| Distance | 2,380 ± 20 ly (729 ± 5 pc) |
| Details4 | |
| Mass | 1.41±0.12 M☉ |
| Radius | 2.11±0.10 R☉ |
| Luminosity | 4.674+0.064 −0.0532 L☉ |
| Surface gravity (log g) | 3.94±0.04 cgs |
| Temperature | 6,120±140 K |
| Metallicity [Fe/H] | +0.22±0.12 dex |
| Rotational velocity (v sin i) | 5.7±0.4 km/s |
| Age | 3.40±0.95 Gyr |
| Other designations | |
| TOI-1903, TIC 77156657, WASP-159, TYC 7579-251-15 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
WASP-159 is a star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 12.84,3 making it readily visible in telescopes with an aperture of at least four inches, but not to the naked eye. The star is located relatively far at a distance of 2,380 light-years based on recent parallax measurements from the Gaia spacecraft,2 but it is receding with a heliocentric radial velocity of 35.2 km/s.4
WASP-159 has a stellar classification of F9 indicating that it is a late F-type star.4 It appears to be ceasing hydrogen fusion at its core and evolving towards the red giant branch.4 It has 1.41 times the Sun's mass and 2.11 times the radius of the Sun.4 It radiates 4.674 times the luminosity of the Sun2 from its photosphere at an effective temperature of 6,120 K,4 giving it a whitish-yellow hue when viewed in a telescope. WASP-159 is metal enriched with an iron abundance 166% that of the Sun, and it is estimated to be 3.4 billion years old.4
Planetary system
In 2019, SuperWASP discovered a transiting exoplanet orbiting the star after spectral and radial velocity observations. WASP-159b is a "bloated" hot Jupiter that takes roughly 3.8 days to revolve around its host star in a circular orbit.4
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | 0.55±0.08 MJ | 0.0538±0.0015 | 3.8404008+0.0000063 −0.0000064 |
0.00 (fixed) | 88.1±1.4 | 1.38±0.09 RJ |
References
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.
- 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. (1 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.
- Hellier, Coel; Anderson, D. R.; Bouchy, F.; Burdanov, A.; Collier Cameron, A.; Delrez, L.; Gillon, M.; Jehin, E.; Lendl, M.; Nielsen, L. D.; Maxted, P. F. L.; Pepe, F.; Pollacco, D.; Queloz, D.; Ségransan, D.; Smalley, B.; Triaud, A. H. M. J.; Udry, S.; West, R. G. (1 January 2019). "New transiting hot Jupiters discovered by WASP-South, Euler/CORALIE, and TRAPPIST-South". Monthly Notices of the Royal Astronomical Society. 482 (1): 1379–1391. arXiv:1803.02224. Bibcode:2019MNRAS.482.1379H. doi:10.1093/mnras/sty2741. ISSN 0035-8711.
- "WASP-159". SIMBAD. Centre de données astronomiques de Strasbourg.