Kepler-421 (KOI-1274 A) is a yellow

main sequence In astronomy, the main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness. These color-magnitude plots are known as Hertzsprung–Russell diagrams after their co-developers, Ejnar Her ...

star A star is an astronomical object comprising a luminous spheroid of plasma (physics), plasma held together by its gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked ...

, being of spectral class G7V. Orange star of spectral class K9V (KOI-1274 B), projected on sky plane just 1.085″ away, is not physically associated to it. The distance to star KOI-1274 A is approximately 1150 light-years, and to KOI-1274 B is about 1900 light-years.

Planetary system

Kepler-421 has an

exoplanet An exoplanet or extrasolar planet is a planet outside the Solar System. The first possible evidence of an exoplanet was noted in 1917 but was not recognized as such. The first confirmation of detection occurred in 1992. A different planet, init ...

(

Kepler-421b Kepler-421b is an exoplanet that, as of July 2014, has the longest known year of any transiting planet (704 days), although not as long as the planets that have been directly imaged, or many of the planets found by the radial-velocity method, or a ...

), which is notable for its position near the

snow line The climatic snow line is the boundary between a snow-covered and snow-free surface. The actual snow line may adjust seasonally, and be either significantly higher in elevation, or lower. The permanent snow line is the level above which snow wil ...

References

G-type main-sequence stars

1274 Year 1274 ( MCCLXXIV) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. Events By place Europe * May 7 – Second Council of Lyon: Pope Gregory X convenes a council at Lyon, after E ...

K-type main-sequence stars J18530163+4505159 Planetary transit variables Planetary systems with one confirmed planet Lyra {{main-star-stub