WASP-20
WASP-20
Star in the constellation Cetus
WASP-20, also known as CD-24 102, is a binary star[4] system in the equatorial constellation Cetus, located at a distance of about 940 light-years (290 parsecs) from the Sun. The primary star is an F-type main sequence star and hosts one confirmed exoplanet, WASP-20b.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cetus[1] |
| Right ascension | 00h 20m 38.53504s[2] |
| Declination | −23° 56′ 08.6028″[2] |
| Apparent magnitude (V) | 10.779[3] |
| Characteristics | |
| Spectral type | F9V[4] |
| Astrometry | |
| Radial velocity (Rv) | 1.26±0.85[2] km/s |
| Proper motion (μ) | RA: 1.352 mas/yr[2] Dec.: -14.739 mas/yr[2] |
| Parallax (π) | 3.4699 ± 0.7095 mas[2] |
| Distance | approx. 900 ly (approx. 290 pc) |
| Details[5] | |
| Mass | 1.200±0.041 M☉ |
| Radius | 1.392±0.044 R☉ |
| Temperature | 5940±100 K |
| Metallicity [Fe/H] | −0.008±0.060 dex |
| Rotational velocity (v sin i) | 4.75±0.51 km/s |
| Age | 7.0+2.0 −1.0 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
WASP-20 is a star of spectral type F9, aged 7+2
−1 billion years. Its mass is 1.200 ± 0.041 solar masses for a radius of 1.392 ± 0.044 solar radii, or a density of 0.630 ± 0.046 grams per cubic centimeter.[7]
WASP-20b is a transiting hot Jupiter discovered in 2014.[7] WASP-20b orbits WASP-20 in less than five Earth days very close to its star (0.06 AU) in a circular (near-zero eccentricity) orbit. The orbit is inclined by 85.56 ± 0.22° relative to the plane of the sky and is thus edge-on, as necessary for a transit to be observed.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.311+0.019 −0.018 MJ |
0.05999+0.00069 −0.00068 |
4.8996284(33) | <0.039 | 85.56±0.22° | 1.462±0.059 RJ |
- "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.
- 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.
- "CD-24 102". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 April 2024.
- Evans, Daniel F.; Southworth, John; Smalley, Barry (December 2016). "WASP-20 Is a Close Visual Binary with a Transiting Hot Jupiter". The Astrophysical Journal Letters. 833 (2): L19. arXiv:1611.08735. Bibcode:2016ApJ...833L..19E. doi:10.3847/2041-8213/833/2/L19.
- Bonomo, A. S.; Desidera, S.; et al. (June 2017). "The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy & Astrophysics. 602: A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882.
- Anderson, D. R.; Collier Cameron, A.; et al. (March 2015). "WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars". Astronomy & Astrophysics. 575: A61. arXiv:1402.1482. Bibcode:2015A&A...575A..61A. doi:10.1051/0004-6361/201423591.