WASP-55 is a G-type main-sequence star about 980 light-years away. The star is much younger than the Sun at approximately 1.1+0.8
−0.6 billion years.[3] WASP-55 is similar to the Sun in concentration of heavy elements.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Virgo |
| Right ascension | 13h 35m 01.9538s[1] |
| Declination | −17° 30′ 12.5263″[1] |
| Apparent magnitude (V) | 11.75 |
| Characteristics | |
| Evolutionary stage | Main sequence[citation needed] |
| Spectral type | G1 |
| Astrometry | |
| Radial velocity (Rv) | -4.09[1] km/s |
| Proper motion (μ) | RA: 12.072[1] mas/yr Dec.: −3.837[1] mas/yr |
| Parallax (π) | 3.3337 ± 0.0438 mas[1] |
| Distance | 980 ± 10 ly (300 ± 4 pc) |
| Details[2] | |
| Mass | 1.04±0.05 M☉ |
| Radius | 1.11+0.13 −0.09 R☉ |
| Surface gravity (log g) | 4.34 cgs |
| Temperature | 5,965 K |
| Metallicity [Fe/H] | 0.00 dex |
| Rotational velocity (v sin i) | 2.7 km/s |
| Age | 1.1+0.8 −0.6[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
A multiplicity survey in 2016 found one candidate stellar companion to WASP-55 at a projected separation of 4.435″±0.018″.[5] 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.[6]
Planetary system
In 2012 a transiting hot Jupiter planet b was detected on a tight, circular orbit.[7] Its equilibrium temperature is 1,305 K.[8]
| 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[8] | 4.4656291 | <0.1 | 89.0±0.2[8]° | 1.34±0.01[8] RJ |
References
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