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HAT-P-21

HAT-P-21 / Mazalaai
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
Right ascension 11h 25m 05.9859s[1]
Declination +41° 01′ 40.665″[1]
Apparent magnitude (V) 11.46[2]
Characteristics
Spectral type G3V
Astrometry
Radial velocity (Rv)-51.98 km/s
Proper motion (μ) RA: −1.142(17) mas/yr[1]
Dec.: 13.523(24) mas/yr[1]
Parallax (π)3.5190 ± 0.0228 mas[1]
Distance927 ± 6 ly
(284 ± 2 pc)
Details[3][4]
Mass0.947±0.042 M☉
Radius1.105±0.083 R☉
Luminosity1.06+0.20
−0.16 L☉
Surface gravity (log g)4.33±0.06 cgs
Temperature5634±67 K
Metallicity0.04±0.08
Rotation15.88±0.02 d[5]
Rotational velocity (v sin i)3.5±0.5 km/s
Age10.2±2.5 Gyr
Other designations
Mazalaai, Gaia DR3 770622651659107712, TYC 3013-1229-1, GSC 03013-01229, 2MASS J11250598+4101406[2]
Database references
SIMBADdata

HAT-P-21 is a G-type main-sequence star about 927 light-years away. The star has amount of metals similar to solar abundance. The survey in 2015 has failed to detect any stellar companions.[6] The star is rotating rapidly, being spun up by the tides of giant planet on close orbit.[4]

  1. ^ a b c d Cite error: The named reference Gaia DR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference simbad was invoked but never defined (see the help page).
  3. ^ Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (2016), "Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes", The Astronomical Journal, 153 (3): 136, arXiv:1609.04389, Bibcode:2017AJ....153..136S, doi:10.3847/1538-3881/aa5df3, S2CID 119219062
  4. ^ a b Maxted, P. F. L.; Serenelli, A. M.; Southworth, J. (2015), "A 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
  5. ^ Cite error: The named reference Mancini2022 was invoked but never defined (see the help page).
  6. ^ Wöllert, Maria; Brandner, Wolfgang; Bergfors, Carolina; Henning, Thomas (2015), "A Lucky Imaging search for stellar companions to transiting planet host stars", Astronomy & Astrophysics, 575: A23, arXiv:1507.01938, Bibcode:2015A&A...575A..23W, doi:10.1051/0004-6361/201424091, S2CID 119250579

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