Kepler-26

Kepler-26 is a star in the northern constellation of Lyra. It is located at the celestial coordinates: Right Ascension 18^h 59^m 45.8408^s Declination +46° 33′ 59.438″.^[2] With an apparent visual magnitude of 15.5,^[3] this star is too faint to be seen with the naked eye.

Kepler-26

The Kepler-26 system, with the circumstellar habitable zone in green.
Observation data Epoch J2000      Equinox J2000
Constellation	Lyra[1]
Right ascension	18h 59m 45.8408s[2]
Declination	+46° 33′ 59.438″[2]
Apparent magnitude (V)	15.473[3]
Characteristics
Spectral type	M0V[4]
Astrometry
Proper motion (μ)	RA: 9.462(27) mas/yr[2] Dec.: −13.942(26) mas/yr[2]
Parallax (π)	2.9378±0.0211 mas[2]
Distance	1,110 ± 8 ly (340 ± 2 pc)
Details
Mass	0.65[3] M☉
Radius	0.59[3] R☉
Luminosity	0.1[3] L☉
Temperature	4500[3] K
Metallicity [Fe/H]	-0.21[3] dex
Rotation	17.918±0.005 days[5]
Rotational velocity (v sin i)	1.9[3] km/s
Other designations
KOI-250, KIC 9757613, 2MASS J18594583+4633595, Gaia DR2 2107317358665730688
Database references
SIMBAD	data
KIC	data

Planetary system

The two planets, Kepler-26b and Kepler-26c, were discovered by transit method in late 2011,^[6] and classified as small (sub-Neptune) gas giants in 2016.^[7] In 2012, the planetary candidate Kepler-26d was also detected, and confirmed in 2014.^[8] The planet Kepler-26e was discovered on a much wider orbit in 2014.^[9]

The Kepler-26 planetary system^[4][7][10]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
d	—	0.039	3.543919	—	—	1.2 R🜨
b	5.1±0.7 M🜨	0.085	12.2829	—	—	2.78±0.11 R🜨
c	6.2±0.7 M🜨	0.107	17.2513	—	—	2.72±0.12 R🜨
e	—	0.22	46.827915	—	—	2.1 R🜨