| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 mas [1] |
| 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
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d e 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, arXiv: 1211.0810, doi: 10.1051/0004-6361/201220363, S2CID 54502046
- ^ a b c Ngo, Henry; Knutson, Heather A.; Hinkley, Sasha; Bryan, Marta; Crepp, Justin R.; Batygin, Konstantin; Crossfield, Ian; Hansen, Brad; Howard, Andrew W.; Johnson, John A.; Mawet, Dimitri; Morton, Timothy D.; Muirhead, Philip S.; Wang, Ji (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, arXiv: 1606.07102, Bibcode: 2016ApJ...827....8N, doi: 10.3847/0004-637X/827/1/8, S2CID 41083068
- ^ a b c Bonomo, A. S.; et al. (2017), "The GAPS Programme with HARPS-N at TNG", Astronomy & Astrophysics, 602: A107, arXiv: 1704.00373, Bibcode: 2017A&A...602A.107B, doi: 10.1051/0004-6361/201629882, S2CID 118923163
- ^ a b c Andreasen, D. T.; Sousa, S. G.; Tsantaki, M.; Teixeira, G. D. C.; Mortier, A.; Santos, N. C.; Suárez-Andrés, L.; Delgado-Mena, E.; Ferreira, A. C. S. (2017), "SWEET-Cat update and FASMA", Astronomy & Astrophysics, 600: A69, arXiv: 1703.06671, doi: 10.1051/0004-6361/201629967, S2CID 119534579
- ^ 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, arXiv: 1406.4402, Bibcode: 2014MNRAS.442.1844B, doi: 10.1093/mnras/stu950
- ^ "WASP-58". SIMBAD. Centre de données astronomiques de Strasbourg.
- ^ 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, arXiv: 1507.01938, Bibcode: 2015A&A...575A..23W, doi: 10.1051/0004-6361/201424091, S2CID 119250579
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