Kepler-411

Kepler-411 is a binary star system. Its primary star Kepler-411A is a K-type main-sequence star, orbited by the red dwarf star Kepler-411B on a wide orbit, discovered in 2012.^[6]

Kepler-411

Observation data Epoch J2000      Equinox J2000
Constellation	Cygnus[1]
Right ascension	19h 10m 25.34699s[2]
Declination	+49° 31′ 23.7126″[2]
Apparent magnitude (V)	12.55[3]
Characteristics
Kepler-411A
Evolutionary stage	main sequence[2]
Spectral type	K3V[4]
Astrometry
Kepler-411A
Radial velocity (Rv)	−20.40±0.77[2] km/s
Proper motion (μ)	RA: 13.611[2] mas/yr Dec.: 32.543[2] mas/yr
Parallax (π)	6.5313±0.0080 mas[5]
Distance	499.4 ± 0.6 ly (153.1 ± 0.2 pc)
Kepler-411B
Proper motion (μ)	RA: 13.263[5] mas/yr Dec.: 33.008[5] mas/yr
Parallax (π)	6.5727±0.0573 mas[5]
Distance	496 ± 4 ly (152 ± 1 pc)
Position (relative to Kepler-411A)[6]
Component	Kepler-411B
Epoch of observation	2012
Angular distance	3.4±0.06″
Position angle	331±3°
Projected separation	520 AU
Details
Kepler-411A
Mass	0.75[2] M☉
Radius	0.76[2] R☉
Luminosity	0.27[2] L☉
Surface gravity (log g)	4.58[2] cgs
Temperature	4,773[2] K
Metallicity [Fe/H]	0.11±0.1[7] dex
Rotation	10.52 d[8]
Age	0.212±0.031[9] Gyr
Kepler-411B
Mass	0.33[10] M☉
Radius	0.49[6] R☉
Temperature	3,446[10] K
Other designations
Kepler-411A: KOI-1781, KIC 11551692, 2MASS J19102533+4931237[11]
Kepler-411B: Gaia DR3 2132768956904826624
Database references
SIMBAD	data
	B

Primary star

The primary star's surface temperature is 4,773 K. Kepler-411A is similar to the Sun in its concentration of heavy elements, with a metallicity Fe/H index of 0.11±0.1,^[7] but is much younger at an age of 212±31 million years.^[9]

Kepler-411A exhibits significant starspot activity, with starspots covering 1.7^+0.3
_−0.2% of the stellar surface.^[12] Darker starspots are concentrated around the equator of the star. Kepler-411A exhibits differential rotation, but with smaller amount of differential shear compared to the Sun.^[8]

The companion Kepler-411B is 533 au away from Kepler-411A.^[10] It is a red dwarf and a flare star.^[13]

Planetary system

In 2013, one planet, named Kepler-411b, was discovered,^[14] followed by planet Kepler-411c in 2016. Third planet in system detected by transit method, d, along with e detected by radial velocity method, were discovered in 2019.^[15][9]

The Kepler-411 planetary system

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b[16]	0.08055±0.00818 MJ	0.0375±0.0008	3.005156±0.000002	0.146+0.004 −0.005	87.4±0.1°	0.214±0.005 RJ
c[17]	0.08306±0.01856 MJ	0.0739±0.001	7.834436247±0.000001137[18]	0.108+0.003 −0.004	88.61±0.04°	0.394±0.006 RJ
d[19]	0.04782±0.01605 MJ	0.279±0.004	58.02023116±0.00004203[18]	0.128±0.003	89.43±0.02°	0.296±0.009 RJ
e[20]	0.03398±0.00346 MJ	0.186±0.003	31.509728±0.000085	0.016+0.002 −0.001	88.04±0.02°	—