WASP-84
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 08h 44m 25.70315s |
| Declination | +01° 51′ 36.1055″ |
| Apparent magnitude (V) | 10.83 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | G9V |
| Astrometry | |
| Radial velocity (Rv) | −11.63±0.21 km/s |
| Proper motion (μ) | RA: −23.344 mas/yr Dec.: −31.570 mas/yr |
| Parallax (π) | 9.9636±0.0149 mas |
| Distance | 327.3 ± 0.5 ly (100.4 ± 0.2 pc) |
| Details | |
| Mass | 0.842+0.037 −0.036 M☉ |
| Radius | 0.748±0.015 R☉ |
| Luminosity | 0.48 L☉ |
| Surface gravity (log g) | 4.63±0.06 cgs |
| Temperature | 5350±31 K |
| Metallicity [Fe/H] | 0.05±0.02 dex |
| Rotation | 14.36±0.35 d |
| Rotational velocity (v sin i) | 4.10±0.30 km/s |
| Age | 8.5+4.1 −5.5 Gyr |
| Other designations | |
| BD+02 2056, Gaia DR2 3078836109158636928, WASP-84, TYC 211-706-1, GSC 00211-00706, 2MASS J08442570+0151361 | |
| Database references | |
| SIMBAD | data |
WASP-84, also known as BD+02 2056, is a G-type main-sequence star 327 light-years (100 parsecs) away in the constellation Hydra. Its surface temperature is 5350±31 K and is slightly enriched in heavy elements compared to the Sun, with a metallicity Fe/H index of 0.05±0.02. It is rich in carbon and depleted of oxygen. WASP-84's age is probably older than the Sun at 8.5+4.1
−5.5 billion years. The star appears to have an anomalously small radius, which can be explained by the unusually high helium fraction or by it being very young.
A multiplicity survey did not detect any stellar companions to WASP-84 as of 2015.