Astronomy:WASP-58
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 18m 48.2531s[1] |
| Declination | 45° 10′ 19.2592″[1] |
| Apparent magnitude (V) | 11.66[2] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | G2V[2] |
| Astrometry | |
| Radial velocity (Rv) | -28.708[1] km/s |
| Proper motion (μ) | RA: 32.579[1] mas/yr Dec.: 47.140[1] mas/yr |
| Parallax (π) | 3.4147 ± 0.0214[1] mas |
| Distance | 955 ± 6 ly (293 ± 2 pc) |
| Orbit[3] | |
| Primary | WASP-58A |
| Companion | WASP-58B |
| Semi-major axis (a) | 1.281±0.002" (384±64 AU) |
| Details[4] | |
| WASP-58A | |
| Mass | 0.940±0.100 M☉ |
| Radius | 1.17±0.13 R☉ |
| Surface gravity (log g) | 4.23±0.1[5] cgs |
| Temperature | 6039±55[5] K |
| Metallicity [Fe/H] | -0.09±0.04 dex |
| Rotation | 22.6+11.7−6.1 d[6] |
| Rotational velocity (v sin i) | 2.8±0.9 km/s |
| Age | 12.80+0.20−2.10 Gyr |
| WASP-58B | |
| Temperature | 3396±53[3] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
WASP-58 is a binary star system comprising a G-type main-sequence star and a red dwarf about 955 light-years away. WASP-58 is slightly depleted in heavy elements, having 80% of the solar abundance of iron.[5] WASP-58 is much older than the Sun at 12.80+0.20−2.10 billion years.[4]
Lithium was detected in the stellar spectrum of WASP-58A, making the star anomalous for its advanced age.[2]
A multiplicity survey in 2015 did detect a red dwarf stellar companion[8] at a projected separation of 1.281±0.002″ to WASP-58A, and it was confirmed to be gravitationally bound in 2016.[3]
Planetary system
In 2012 a transiting hot Jupiter planet b was detected on a tight, circular orbit around the primary star WASP-58A.[2]
Planetary equilibrium temperature is 1270±80 K.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.899+0.074−0.072 MJ | 0.0562+0.0019−0.0020 | 5.017180±0.000011 | <0.044 | 87.4±1.5° | 1.37±0.2 RJ |
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Hébrard, G. et al. (2012), "WASP-52b, WASP-58b, WASP-59b, and WASP-60b: Four new transiting close-in giant planets", Astronomy & Astrophysics 549: A134, doi:10.1051/0004-6361/201220363
- ↑ 3.0 3.1 3.2 Ngo, Henry; Knutson, Heather A.; Hinkley, Sasha; Bryan, Marta; Crepp, Justin R.; Batygin, Konstantin; Crossfield, Ian; Hansen, Brad et al. (2016), "FRIENDS OF HOT JUPITERS. IV. STELLAR COMPANIONS BEYOND 50 au MIGHT FACILITATE GIANT PLANET FORMATION, BUT MOST ARE UNLIKELY TO CAUSE KOZAI–LIDOV MIGRATION", The Astrophysical Journal 827 (1): 8, doi:10.3847/0004-637X/827/1/8, Bibcode: 2016ApJ...827....8N
- ↑ 4.0 4.1 4.2 Bonomo, A. S. et al. (2017), "The GAPS Programme with HARPS-N at TNG", Astronomy & Astrophysics 602: A107, doi:10.1051/0004-6361/201629882, Bibcode: 2017A&A...602A.107B
- ↑ 5.0 5.1 5.2 Andreasen, D. T.; Sousa, S. G.; Tsantaki, M.; Teixeira, G. D. C.; Mortier, A.; Santos, N. C.; Suárez-Andrés, L.; Delgado-Mena, E. et al. (2017), "SWEET-Cat update and FASMA", Astronomy & Astrophysics 600: A69, doi:10.1051/0004-6361/201629967
- ↑ Brown, D. J. A. (2014), "Discrepancies between isochrone fitting and gyrochronology for exoplanet host stars?", Monthly Notices of the Royal Astronomical Society 442 (2): 1844–1862, doi:10.1093/mnras/stu950, Bibcode: 2014MNRAS.442.1844B
- ↑ "WASP-58". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=WASP-58.
- ↑ Wöllert, Maria; Brandner, Wolfgang; Bergfors, Carolina; Henning, Thomas (2015), "A Lucky Imaging search for stellar companions to transiting planet host stars", Astronomy & Astrophysics 575: A23, doi:10.1051/0004-6361/201424091, Bibcode: 2015A&A...575A..23W
Coordinates: 
23h 18m 29.5475s, +24° 53′ 21.4364″
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