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Observation data
Epoch 2000      Equinox 2000
Constellation Cygnus[1]
Right ascension 19h 50m 50.25s[2]
Declination +48° 04′ 51.1″[2]
Apparent magnitude (V) 9.473[3] 9.59 [4]
Spectral type K4 [4]
Apparent magnitude (B) 10.66±0.05[3]
Apparent magnitude (J) 7.608±0.029[5]
Apparent magnitude (H) 7.131±0.021[5]
Apparent magnitude (K) 7.009±0.020[5]
Proper motion (μ) RA: 127.20±0.83[2] mas/yr
Dec.: 231.23±0.80[2] mas/yr
Parallax (π) 26.69 ± 0.85[2] mas
Distance 122 ± 4 ly
(37 ± 1 pc)
Absolute magnitude (MV) 6.57±0.09[4]
Mass 0.81+0.03
[4] M
Radius 0.683±0.009[6] R
Luminosity 0.26±0.02[4] L
Surface gravity (log g) 4.59±0.03[4] cgs
Temperature 4780±50[4] K
Metallicity [Fe/H] 0.31±0.05[4] dex
Rotational velocity (v sin i) 1.5±1.5[4] km/s
Age 6.5+5.9
[4] Gyr
Other designations
BD+47°2936, KIC 10748390, KOI 3, GSC 03561-02092, HIP 97657, NLTT 48335, USNO-B1.0 1380-00392296[3]

HAT-P-11, also designated GSC 03561-02092, is an orange dwarf metal rich star about 123 light-years away in the constellation Cygnus. This star is notable for its relatively large rate of proper motion. The magnitude of this star is about 9, 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]

Planetary system[edit]

Artist Illustration of planet HAT-P-11b.[8]

An extrasolar planet, was discovered by transit method of the HATNet Project, believed to be a little larger than Neptune.

That planet orbits out of alignment from the star's spin axis. The system is oblique at 100°.[7]

This star system was within the field of view of the Kepler Mission planet-hunter spacecraft.[4]

The HAT-P-11 planetary system[4][6]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 0.081±0.009 MJ 0.053+0.0002
4.8878018±0.0000016 0.198±0.046 4.58±0.15 R

See also[edit]


  1. ^ Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034.  Vizier query form
  2. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752free to read. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  3. ^ a b c d "SIMBAD query result: G 208-41 -- High proper-motion Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-22. 
  4. ^ a b c d e f g h i j k l Bakos, G. Á.; et al. (2010). "HAT-P-11b: A Super-Neptune Planet Transiting a Bright K Star in the Kepler Field". The Astrophysical Journal. 710 (2): 1724–1745. arXiv:0901.0282free to read. Bibcode:2010ApJ...710.1724B. doi:10.1088/0004-637X/710/2/1724. 
  5. ^ a b c Skrutskie, M. F.; et al. (2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708. Vizier catalog entry
  6. ^ a b Deming, Drake; et al. (2011). "Kepler and Ground-based Transits of the Exo-Neptune HAT-P-11b". The Astrophysical Journal. 740 (1). 33. arXiv:1107.2977free to read. Bibcode:2011ApJ...740...33D. doi:10.1088/0004-637X/740/1/33. 
  7. ^ a b Roberto Sanchis-Ojeda; Josh N. Winn; Daniel C. Fabrycky (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten. 334: 180–183. arXiv:1211.2002free to read. Bibcode:2013AN....334..180S. doi:10.1002/asna.201211765. 
  8. ^ "Clear skies on exo-Neptune". www.spacetelescope.org. ESA/Hubble. Retrieved 25 September 2014. 

External links[edit]

Coordinates: Sky map 19h 50m 50.2469s, +48° 04′ 51.085″