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Kepler-44
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| 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 |
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.
Planetary system
[edit]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🜨 |
References
[edit]- ^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
- ^ a b c d e 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 Santos, N. C.; Sousa, S. G.; Mortier, A.; Neves, V.; Adibekyan, V.; Tsantaki, M.; Delgado Mena, E.; Bonfils, X.; Israelian, G.; Mayor, M.; Udry, S. (2013). "SWEET-Cat: A catalogue of parameters for Stars with ExoplanETs. I. New atmospheric parameters and masses for 48 stars with planets". Astronomy and Astrophysics. 556: A150. arXiv:1307.0354. Bibcode:2013A&A...556A.150S. doi:10.1051/0004-6361/201321286.
- ^ a b Schneider, Jean, "Star: Kepler-44", Extrasolar Planets Encyclopaedia, archived from the original on 2014-03-04, retrieved 2011-12-06
- ^ a b c d e f Kepler-44b, NASA Ames Research Center, archived from the original on 2015-09-14, retrieved 2011-12-06
- ^ Ulmer-Moll, S.; Santos, N. C.; Figueira, P.; Brinchmann, J.; Faria, J. P. (2019). "Beyond the exoplanet mass-radius relation". Astronomy and Astrophysics. 630: A135. arXiv:1909.07392. Bibcode:2019A&A...630A.135U. doi:10.1051/0004-6361/201936049.
- ^ Mazeh, Tsevi; Perets, Hagai B.; McQuillan, Amy; Goldstein, Eyal S. (2015). "Photometric Amplitude Distribution of Stellar Rotation of KOIs—Indication for Spin-Orbit Alignment of Cool Stars and High Obliquity for Hot Stars". The Astrophysical Journal. 801 (1): 3. arXiv:1501.01288. Bibcode:2015ApJ...801....3M. doi:10.1088/0004-637X/801/1/3.
- ^ 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