HAT-P-11

HAT-P-11
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus[1]
Right ascension 19h 50m 50.2473s[2]
Declination +48° 04′ 51.101″[2]
Apparent magnitude (V) 9.59[3]
Characteristics
Spectral type K4V[3]
Apparent magnitude (B) 10.66±0.05[4]
Apparent magnitude (J) 7.608±0.029[5]
Apparent magnitude (H) 7.131±0.021[5]
Apparent magnitude (K) 7.009±0.020[5]
Variable type planetary transit[3]
Astrometry
Radial velocity (Rv)−63.46±0.13[2] km/s
Proper motion (μ) RA: 126.095(13) mas/yr[2]
Dec.: 232.726(13) mas/yr[2]
Parallax (π)26.4274 ± 0.0108 mas[2]
Distance123.42 ± 0.05 ly
(37.84 ± 0.02 pc)
Absolute magnitude (MV)6.57±0.09[3]
Details
Mass0.81+0.03
−0.02[3] M☉
Radius0.683±0.009[6] R☉
Luminosity0.26±0.02[3] L☉
Surface gravity (log g)4.59±0.03[3] cgs
Temperature4780±50[3] K
Metallicity [Fe/H]0.31±0.05[3] dex
Rotation~29.2 days[3]
Rotational velocity (v sin i)1.5±1.5[3] km/s
Age6.5+5.9
−4.1[3] Gyr
Other designations
HAT-P-11, BD+47°2936, HIP 97657, NLTT 48335, Kepler-3, KOI-3, KIC 10748390, TOI-1144, TIC 28230919, TYC 3561-2092-1, GSC 03561-02092[4]
Database references
SIMBADdata
KICdata

HAT-P-11, also designated GSC 03561-02092 and Kepler-3, is a metal-rich orange dwarf star with a planetary system, 123 light-years (38 parsecs) away in the constellation Cygnus. This star is notable for its relatively large rate of proper motion. The apparent magnitude of this star is about 9.6, which means it is not visible to the naked eye but can be seen with a medium-sized amateur telescope on a clear dark night. The age of this star is about 6.5 billion years.[3]

The star has active latitudes that generate starspots.[7] The spots are similar in distribution to those on the Sun, but HAT-P-11 is a more active star and has a starspot coverage approximately 100 times greater than the Sun.[8] The star appears to have an unusually small radius, which can be explained by the anomalously high helium fraction.[9]

  1. ^ Cite error: The named reference Roman1987 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Gaia DR3 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i j k l m Cite error: The named reference Bakos2010 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Skrutskie2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Deming2011 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Sanchis-Ojeda2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Morris2017 was invoked but never defined (see the help page).
  9. ^ 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