WASP-55
Star in constellation of Virgo
From Wikipedia, the free encyclopedia
WASP-55 is a G-type main-sequence star about 954 light-years away in the constellation Virgo. The star is much younger than the Sun at approximately 1.1+0.8
−0.6 billion years.[8] WASP-55 is similar to the Sun in concentration of heavy elements.[10]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo[1] |
| Right ascension | 13h 35m 01.9538s[2] |
| Declination | −17° 30′ 12.528″[2] |
| Apparent magnitude (V) | 11.75[3] |
| Characteristics | |
| Evolutionary stage | Main sequence[4] |
| Spectral type | G1[4] |
| Astrometry | |
| Radial velocity (Rv) | −3.31±0.87[2] km/s |
| Proper motion (μ) | RA: +12.037 mas/yr[2] Dec.: −3.747 mas/yr[2] |
| Parallax (π) | 3.4194±0.0204 mas[2] |
| Distance | 954 ± 6 ly (292 ± 2 pc) |
| Details | |
| Mass | 1.16±0.03[5] M☉ |
| Radius | 1.11±0.01[5] R☉ |
| Luminosity | 1.48[6] L☉ |
| Surface gravity (log g) | 4.413±0.006[5] cgs |
| Temperature | 6,070+51 −46[5] K |
| Metallicity [Fe/H] | 0.09±0.05[5] dex |
| Rotational velocity (v sin i) | 3.1±1.0[7] km/s |
| Age | 1.1+0.8 −0.6[8] Gyr |
| Other designations | |
| EPIC 212300977, TOI-774, TIC 294301883, WASP-55, TYC 6125-113-1, 2MASS J13350194-1730124[9] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
A multiplicity survey in 2016 found one candidate stellar companion to WASP-55 at a projected separation of 4.435″±0.018″.[11] Follow-up observations in 2017 were unable to confirm if the suspected companion red dwarf star, with a temperature of 3,340±90 K, is gravitationally bound to WASP-55 or not.[12] It was confirmed in 2019 using Gaia DR2 data.[13]
Planetary system
In 2012 a transiting hot Jupiter planet, WASP-55b, was detected on a tight, circular orbit.[14] Its equilibrium temperature is 1,305 K.[5]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.62±0.04 MJ | 0.0558±0.0006 | 4.4656291(11)[8] | <0.056[7] | 89.0±0.2° | 1.34±0.01 RJ |