Kepler-44
Star in the constellation Cygnus
From Wikipedia, the free encyclopedia
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.
| 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]
| 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🜨 |