WASP-84

WASP-84
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]
Distance327.3 ± 0.5 ly
(100.4 ± 0.2 pc)
Details[3]
Mass0.842+0.037
−0.036 M☉
Radius0.748±0.015 R☉
Surface gravity (log g)4.63±0.06[4] cgs
Temperature5350±31[4] K
Metallicity [Fe/H]0.05±0.02[4] dex
Rotation14.36±0.35 d
Rotational velocity (v sin i)4.10±0.30 km/s
Age8.5+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[5]
Database references
SIMBADdata

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]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Anderson2014 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Bonomo2017 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Teske2019 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  6. ^ 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
  7. ^ 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