Kepler-44

Kepler-44, formerly known as KOI-204, is a star in the northern constellation of Cygnus. With an apparent visual magnitude of 15.0^[3] this star is too faint to be seen with the naked eye.

Kepler-44

Observation data Epoch J2000      Equinox J2000
Constellation	Cygnus[1]
Right ascension	20h 00m 24.5657s[2]
Declination	+45° 45′ 43.763″[2]
Apparent magnitude (V)	15.0[3]
Characteristics
Evolutionary stage	subgiant[2]
Spectral type	G0V~G0IV[4]
Astrometry
Proper motion (μ)	RA: −0.956(18) mas/yr[2] Dec.: +8.241(19) mas/yr[2]
Parallax (π)	0.8719±0.0163 mas[2]
Distance	3,740 ± 70 ly (1,150 ± 20 pc)
Details
Mass	1.19±0.10[5] M☉
Radius	1.52±0.09[5] R☉
Luminosity	2.28[6] L☉
Temperature	5,757±134[5] K
Metallicity [Fe/H]	0.26±0.10[5] dex
Rotation	44.68 days[7]
Rotational velocity (v sin i)	5.5±1.5[5] km/s
Age	6.95[5] Gyr
Other designations
KOI-204, KIC 9305831, 2MASS J20002456+4545437
Database references
SIMBAD	data
KIC	data

Planetary system

The Kepler spacecraft detected a transiting planet candidate around this star that was confirmed by radial velocity measurements taken by the SOPHIE spectrograph mounted on the 1.93 m telescope at the Haute-Provence Observatory.^[8] The planet is likely to be tidally locked to the parent star. In 2015, the planetary nightside temperature was estimated to be equal to 2347⁺¹⁴⁹
₋₂₈₀ K.^[9]

The Kepler-44 planetary system^[4]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	1.02 MJ	0.0455	3.246774	—	—	13 R🜨