| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | 08h 44m 25.70315s[1] |
| Declination | +01° 51′ 36.1055″[1] |
| Apparent magnitude (V) | 10.83 |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | G9V[2] |
| Astrometry | |
| Radial velocity (Rv) | −11.63±0.21[1] km/s |
| Proper motion (μ) | RA: −23.344 mas/yr[1] Dec.: −31.570 mas/yr[1] |
| Parallax (π) | 9.9636 ± 0.0149 mas[1] |
| Distance | 327.3 ± 0.5 ly (100.4 ± 0.2 pc) |
| Details[3] | |
| Mass | 0.842+0.037 −0.036 M☉ |
| Radius | 0.748±0.015 R☉ |
| Surface gravity (log g) | 4.63±0.06[4] cgs |
| Temperature | 5350±31[4] K |
| Metallicity [Fe/H] | 0.05±0.02[4] 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 | |
| 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.[4] WASP-84's age is probably older than the Sun at 8.5+4.1
−5.5 billion years.[3] 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.[6]
A multiplicity survey did not detect any stellar companions to WASP-84 as of 2015.[7]
- ^ a b c d e Cite error: The named reference
GaiaDR3was invoked but never defined (see the help page). - ^ Cite error: The named reference
Anderson2014was invoked but never defined (see the help page). - ^ a b Cite error: The named reference
Bonomo2017was invoked but never defined (see the help page). - ^ a b c d Cite error: The named reference
Teske2019was invoked but never defined (see the help page). - ^ Cite error: The named reference
SIMBADwas invoked but never defined (see the help page). - ^ Maxted, P. F. L.; Serenelli, A. M.; Southworth, J. (2015), "Comparison of gyrochronological and isochronal age estimates for transiting exoplanet host stars", Astronomy & Astrophysics, 577: A90, arXiv:1503.09111, Bibcode:2015A&A...577A..90M, doi:10.1051/0004-6361/201525774, S2CID 53324330
- ^ Wöllert, Maria; Brandner, Wolfgang (2015), "A Lucky Imaging search for stellar sources near 74 transit hosts", Astronomy & Astrophysics, 579: A129, arXiv:1506.05456, Bibcode:2015A&A...579A.129W, doi:10.1051/0004-6361/201526525, S2CID 118903879