HAT-P-11

Also known as Kepler-3, HIP 97657, HIC 97657, KIC 10748390, TOI-1144, NLTT 48335, KOI-3, SPOCS 4127

HAT-P-11, also designated GSC 03561-02092 and Kepler-3, is a metal-rich orange dwarf star with a planetary system, 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.

Wikidata facts

Distance from Earth: 37.89
Diameter: 1130000
Radius: 0.683
Mass: 0.809

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spectral class: K4V
catalog code: KOI-3
effective temperature: 4780
apparent magnitude: 9.158262
radial velocity: -63.7
parallax: 26.4274
metallicity: 0.21
stellar rotational velocity

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Planetary system
See also
References
External links

The star has active latitudes that generate starspots. 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. The star appears to have an unusually small radius, which can be explained by the anomalously high helium fraction.