WASP-21

WASP 21 / Tangra

Size comparison between Sun and WASP-21
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus
Right ascension 23h 09m 58.25s[1]
Declination +18° 23′ 45.9″[1]
Apparent magnitude (V) 11.58 ± 0.08[1]
Characteristics
Spectral type G3V
Astrometry
Radial velocity (Rv)-89.45 [1] km/s
Proper motion (μ) RA: 17.597 ± 0.074 [2] mas/yr
Dec.: 18.867 ± 0.05 [2] mas/yr
Parallax (π)3.8412 ± 0.0427 mas[2]
Distance849 ± 9 ly
(260 ± 3 pc)
Absolute magnitude (MV)4.97
Details
Mass0.89 ± 0.071[3] M☉
Radius1.136 ± 0.049[3] R☉
Surface gravity (log g)4.277 ± 0.025[3] cgs
Temperature5800 ± 100[1] K
Metallicity-0.4 ± 0.1 [1]
Metallicity [Fe/H]-0.46 ± 0.11 [1] dex
Rotational velocity (v sin i)1.5 ± 0.6 [1] km/s
Age12 ± 5[1] Gyr
Other designations
Tangra, GSC 01715-00679, 2MASS J23095825+1823459, Gaia DR2 2831084391023184128
Database references
SIMBADdata

WASP-21 is a G-type star (spectral type G3V) that is reaching the end of its main sequence lifetime[4][5] approximately 850 light years from Earth in the constellation of Pegasus. The star is relatively metal-poor, having 40% of heavy elements compared to the Sun.[5] Kinematically, WASP-21 belongs to the thick disk of the Milky Way.[1] It has an exoplanet named WASP-21b. [6]

The survey in 2012 have failed to find any stellar companions to WASP-21.[7]

  1. ^ a b c d e f g h i j Cite error: The named reference bouchy2010 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference ciceri2013 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Barros2011 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Seeliger2015 was invoked but never defined (see the help page).
  6. ^ "Exoplanet-catalog". Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 2022-12-10.
  7. ^ Ginski, C.; Mugrauer, M.; Seeliger, M.; Eisenbeiss, T. (2012), "A lucky imaging multiplicity study of exoplanet host stars", Monthly Notices of the Royal Astronomical Society, 421 (3): 2498–2509, arXiv:1202.4586, Bibcode:2012MNRAS.421.2498G, doi:10.1111/j.1365-2966.2012.20485.x, S2CID 118573795