Kepler-44

Last updated
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

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

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
b1.02  MJ 0.04553.246774——13  R🜨

References

  1. ↑ 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.
  2. 1 2 3 4 5 6 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.
  3. 1 2 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.
  4. 1 2 Schneider, Jean, "Star: Kepler-44", Extrasolar Planets Encyclopaedia , archived from the original on 2014-03-04, retrieved 2011-12-06
  5. 1 2 3 4 5 6 Kepler-44b, NASA Ames Research Center, archived from the original on 2015-09-14, retrieved 2011-12-06
  6. ↑ 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.
  7. ↑ 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.
  8. ↑ 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.
  9. ↑ A Comprehensive Study of Kepler Phase Curves and Secondary Eclipses:Temperatures and Albedos of Confirmed Kepler Giant Planets
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