WASP-18 is a star located in the constellation Phoenix at a distance of about 326 light-years from us. At least one planet orbits a star.
| Wasp-18 | |||
|---|---|---|---|
| Star | |||
 Comparative sizes of the Sun and WASP-18 . | |||
| Observational data ( Age J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Distance | 326 St. years (100 pc ) | ||
| Visible magnitude ( V ) | |||
| Constellation | Phoenix | ||
| Astrometry | |||
| Radial velocity ( R v ) | |||
| Own movement (μ) | RA: 27.46 [3] Dec: 18.67 [3] | ||
| Parallax (π) | 9.48 ± 1.19 [3] mas | ||
| Specifications | |||
| Spectral class | F6IVC [3] | ||
| physical characteristics | |||
| Weight | 1.25 ± 0.130 [4] M ☉ | ||
| Radius | 1.216 ± 0.070 [4] R ☉ | ||
| Age | 0.50-1.50 billion [4] years | ||
| Temperature | 6400 ± 100 [4] K | ||
| Metallicity | |||
| |||
| Database Information | |||
| SIMBAD | data | ||
| Sources: [3] | |||
Features
The star belongs to the class of yellow-white subgiants or dwarfs of the main sequence. The mass and radius of WASP-18 are 1.25 and 1.21 solar, respectively. [4] The age of a star is estimated at about half to one and a half billion years.
Planet System
In 2009, a team of astronomers working with the SuperWASP telescope announced the discovery [6] of the planet WASP-18 b . When it was discovered, the transit method was used. The planet turns very close to the parent star - at a distance of only 0.02 a. e. (approximately 3 million kilometers). She makes one revolution around the star in 0.9 days. Judging by the size, mass and proximity of the planet to the parent star, it can be attributed to the class of hot Jupiters .
| Planet | Weight ( M J ) | Radius ( R J ) | Circulation period ( days ) | Semimajor axis orbits ( a.u. ) | Eccentricity orbits |
|---|---|---|---|---|---|
| b | 10,300 ± 0,690 | 1,115 ± 0,063 | 0.94145299 | 0,02026 | 0.0092 |
Notes
- ↑ 1 2 3 4 Soto M. G., Jenkins J. S. Spectroscopic Parameters and atmosphEric ChemIstriEs of Stars (SPECIES) I. Code description and dwarf stars catalog // Astron. Astrophys. - EDP Sciences , 2018 .-- Vol. 615. - P. A76. - ISSN 0004-6361 ; 0365-0138 ; 1432-0746 ; 1286-4846 - doi: 10.1051 / 0004-6361 / 201731533
- ↑ 1 2 3 4 Gaia Data Release 2 - 2018.
- ↑ 1 2 3 4 5 SIMBAD - WASP-18 in the SIMBAD database . Date of treatment January 13, 2010.
- ↑ 1 2 3 4 5 AF Lanza. Hot Jupiters and the evolution of stellar angular momentum . Arxiv.org (23 Dec 2009). Date of treatment January 13, 2010. Archived April 15, 2012.
- ↑ SIMBAD Astronomical Database
- ↑ Coel Hellier et al. An orbital period of 0.94 days for the hot-Jupiter planet WASP-18b . Nature 460, 1098-1100 (August 27, 2009) doi: 10.1038 / nature08245 (26 June 2009). Date of treatment January 13, 2010. Archived April 15, 2012.
See also
- Superwasp
- Phoenix constellation star list