Qatar-2

Qatar-2
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Right ascension 13h 50m 37.4100s[1]
Declination −06° 48′ 14.4199″[1]
Apparent magnitude (V) 13.3[2]
Characteristics
Spectral type K5V[1]
Astrometry
Radial velocity (Rv)-23.55 km/s
Proper motion (μ) RA: -88.184[1] mas/yr
Dec.: -15.290[1] mas/yr
Parallax (π)5.4849 ± 0.0365 mas[3]
Distance595 ± 4 ly
(182 ± 1 pc)
Details[4][2]
Mass0.727±0.024 M☉
Radius0.7033±0.0080 R☉
Surface gravity (log g)4.601±0.018 cgs
Temperature4645±50 K
Metallicity [Fe/H]0.13±0.1[5] dex
Rotation18.0±0.2
Rotational velocity (v sin i)2.0±0.2 km/s
Age9 Gyr
Other designations
Gaia DR2 3620030644476623616, GSC 04974-00112, 2MASS J13503740-0648145[1]
Database references
SIMBADdata

Qatar-2 is a K-type main-sequence star about 595 light-years away in the constellation of Virgo. The star is much older than Sun, and has a concentration of heavy elements similar to solar abundance.[2] The star features a numerous and long-lived starspots,[4] and belongs to a peculiar variety of inflated K-dwarfs with strong magnetic activity inhibiting internal convection.[6]

  1. ^ a b c d e f Cite error: The named reference simbad was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Bryan2011 was invoked but never defined (see the help page).
  3. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  4. ^ a b Cite error: The named reference Mocnik2017 was invoked but never defined (see the help page).
  5. ^ Esposito, M.; Covino, E.; Desidera, S.; Mancini, L.; Nascimbeni, V.; Zanmar Sanchez, R.; Biazzo, K.; Lanza, A. F.; Leto, G.; Southworth, J.; Bonomo, A. S.; Suárez Mascareño, A.; Boccato, C.; Cosentino, R.; Claudi, R. U.; Gratton, R.; Maggio, A.; Micela, G.; Molinari, E.; Pagano, I.; Piotto, G.; Poretti, E.; Smareglia, R.; Sozzetti, A.; Affer, L.; Anderson, D. R.; Andreuzzi, G.; Benatti, S.; Bignamini, A.; et al. (2017), "The GAPS Programme with HARPS-N at TNG. XIII. The orbital obliquity of three close-in massive planets hosted by dwarf K-type stars: WASP-43, HAT-P-20 and Qatar-2", Astronomy & Astrophysics, 601: A53, arXiv:1702.03136, Bibcode:2017A&A...601A..53E, doi:10.1051/0004-6361/201629720, S2CID 119341241
  6. ^ 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