WASP-64
Star in the constellation Canis Major From Wikipedia, the free encyclopedia
WASP-64 is a star about 1,177 light-years away. It is a G7 class main-sequence star, orbited by a planet WASP-64b. It is younger than the Sun at 3.6±1.6 billion years,[4] and it has a metal abundance similar to the Sun.[2] The star is rotating rapidly, being spun up by the giant planet in a close orbit.[4]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Canis Major |
| Right ascension | 06h 44m 27.60507s[1] |
| Declination | −32° 51′ 30.1793″[1] |
| Apparent magnitude (V) | 12.29[2] |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | G7[2] |
| Apparent magnitude (J) | 11.368[3] |
| Apparent magnitude (H) | 11.079[3] |
| Apparent magnitude (K) | 10.956[3] |
| Astrometry | |
| Radial velocity (Rv) | 34.40±1.23[1] km/s |
| Proper motion (μ) | RA: -19.265 mas/yr[1] Dec.: -1.072 mas/yr[1] |
| Parallax (π) | 2.7721±0.0102 mas[1] |
| Distance | 1,177 ± 4 ly (361 ± 1 pc) |
| Details[2] | |
| Mass | 1.004±0.028 M☉ |
| Radius | 1.058±0.025 R☉ |
| Luminosity | 0.95±0.13 L☉ |
| Surface gravity (log g) | 4.4±0.15 cgs |
| Temperature | 5550±150 K |
| Metallicity [Fe/H] | −0.08±0.11 dex |
| Rotation | 15.8±3.7 d[4] |
| Rotational velocity (v sin i) | 3.4±0.8 km/s |
| Age | 3.554±1.629[4] Gyr |
| Other designations | |
| Atakoraka, TOI-473, TIC 52640302, WASP-64, GSC 07091-01514, 2MASS J06442760-3251302[3] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
WASP-64 was named Atakoraka in 2019 after the Atacora, the largest mountain range in Togo.[5] While an imaging survey in 2017 failed to find any stellar companions,[6] a 2019 survey using Gaia DR2 data found WASP-64 to be the secondary star in a binary system, with a wide separation of 24.2 arcseconds or 9,058 AU.[7] The primary star is designated TYC 7091-1288-1, and can also be called WASP-64 A, with the planet host being WASP-64 B.[8][9]
Planetary system
A transiting hot Jupiter exoplanet orbiting WASP-64 was discovered by WASP in 2012.[2] The planetary equilibrium temperature is 1672+59
−63 K,[2] while the measured dayside temperature is hotter at 1989+87
−88 K.[10] Due to the close proximity of the planet to the parent star, orbital decay of WASP-64b, along with HATS-2, may be detectable in the near future.[11] WASP-64b was named Agouto (after Mount Agou, the highest point of Togo which lies within the Atacora chain) in 2019 by amateur astronomers from Togo as part of the NameExoWorlds contest.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b / Agouto | 1.221+0.073 −0.071 MJ |
0.02652+0.00024 −0.00025 |
1.5732918(15) | <0.054 | 86.57+0.80 −0.60° |
1.244±0.036[10] RJ |
References
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