Loading AI tools
G-type main sequence star in the constellation Phoenix From Wikipedia, the free encyclopedia
WASP-4 is a G-type main-sequence star approximately 891 light-years away in the constellation of Phoenix.[4][1][2] Despite its advanced age, the star is rotating rapidly, being spun up by the tides raised by a giant planet on a close orbit.[8]
Artistic rendering of WASP-4 b | |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Phoenix[1] |
Right ascension | 23h 34m 15.0857s[2] |
Declination | −42° 03′ 41.048″[2] |
Apparent magnitude (V) | 12.468±0.025[3] |
Characteristics | |
Evolutionary stage | Main sequence |
Spectral type | G7V[4] |
Apparent magnitude (V) | 12.468±0.025[3] |
Apparent magnitude (B) | 13.216±0.020[3] |
Variable type | Planetary transit variable[4] |
Astrometry | |
Radial velocity (Rv) | 57.61±0.76[2] km/s |
Proper motion (μ) | RA: 9.950(12) mas/yr[2] Dec.: −87.620(10) mas/yr[2] |
Parallax (π) | 3.6623 ± 0.0147 mas[2] |
Distance | 891 ± 4 ly (273 ± 1 pc) |
Details[5] | |
Mass | 0.89±0.01 M☉ |
Radius | 0.920±0.060 R☉ |
Surface gravity (log g) | 4.484+0.037 −0.047[6] cgs |
Temperature | 5436±34 K |
Metallicity [Fe/H] | −0.050±0.040 dex |
Rotation | 22.2±3.3 d |
Rotational velocity (v sin i) | 2.2+0.6 −1.0 km/s |
Age | 7.0±2.9 Gyr |
Other designations | |
Database references | |
SIMBAD | data |
In 2007 the exoplanet WASP-4b was discovered orbiting this star. With an orbital period of just 1.3 days it is classified as a hot Jupiter.[4] The planet's orbital period appears to be decreasing at a rate of 7.33±0.71 milliseconds per year, suggesting that its orbit is decaying, with a decay timescale of 15.77±1.57 million years. Another superjovian planet in the system is suspected.[9]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 1.164±0.082 MJ | 0.02239±0.00084 | 1.338231587(22) | <0.0033[5] | 88.02±0.69° | 1.312±0.045 RJ |
c (unconfirmed) | ≥5.47±0.44 MJ | 6.82±0.25 | 7001.0±6.6 | — | — | — |
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.