Kepler-44, formerly known as KOI-204, is a star in the northern constellation of Cygnus. It is located at the celestial coordinates: Right Ascension 20h 00m 24.564s, Declination +45° 45′ 43.71″.[5] With an apparent visual magnitude of 16,[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[3] |
| Characteristics | |
| 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[3] M☉ |
| Radius | 1.52±0.09[3] R☉ |
| Temperature | 5757±134[3] K |
| Metallicity [Fe/H] | 0.26±0.10[3] dex |
| Rotational velocity (v sin i) | 5.5±1.5[3] km/s |
| Age | 6.95[3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Planetary system
editThe 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.[6]
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.[7]
| 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🜨 |
References
edit- ^ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15
- ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e f g h Kepler-44b, NASA Ames Research Center, archived from the original on 2015-09-14, retrieved 2011-12-06
- ^ a b Schneider, Jean, "Star: Kepler-44", Extrasolar Planets Encyclopaedia, archived from the original on 2014-03-04, retrieved 2011-12-06
- ^ "Kepler Discoveries". 2011-12-05. Archived from the original on 2010-05-27.
- ^ Bonomo, A. S.; et al. (2012). "SOPHIE velocimetry of Kepler transit candidates. V. The three hot Jupiters KOI-135b, KOI-204b, and KOI-203b (alias Kepler-17b)". Astronomy and Astrophysics. 538. A96. arXiv:1110.5462. Bibcode:2012A&A...538A..96B. doi:10.1051/0004-6361/201118323. S2CID 118528032.
- ^ A Comprehensive Study of Kepler Phase Curves and Secondary Eclipses:Temperatures and Albedos of Confirmed Kepler Giant Planets