Astronomy:Kepler-44
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Short description: Star in the constellation Cygnus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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: −0.943±0.038[2] mas/yr Dec.: 8.225±0.038[2] mas/yr |
| Parallax (π) | 0.8136 ± 0.0229[2] mas |
| Distance | 4,000 ± 100 ly (1,230 ± 30 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 |
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.
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.[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
- ↑ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, http://www.iau.org/public/constellations/#cyg, retrieved 2011-12-15
- ↑ 2.0 2.1 2.2 2.3 2.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Kepler-44b, NASA Ames Research Center, http://kepler.nasa.gov/Mission/discoveries/kepler44b/, retrieved 2011-12-06
- ↑ 4.0 4.1 Schneider, Jean, Star: Kepler-44, http://exoplanet.eu/star.php?st=Kepler-44, retrieved 2011-12-06
- ↑ "Kepler Discoveries". 2011-12-05. http://kepler.nasa.gov/Mission/discoveries/.
- ↑ 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. doi:10.1051/0004-6361/201118323. Bibcode: 2012A&A...538A..96B. https://www.aanda.org/articles/aa/full_html/2012/02/aa18323-11/aa18323-11.html.
- ↑ A Comprehensive Study of Kepler Phase Curves and Secondary Eclipses:Temperatures and Albedos of Confirmed Kepler Giant Planets
Coordinates: 
20h 00m 24.564s, +45° 45′ 43.71″
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