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[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 mas[2]
Distance4,000 ± 100 ly
(1,230 ± 30 pc)
Details
Mass1.19±0.10[3] M☉
Radius1.52±0.09[3] R☉
Temperature5757±134[3] K
Metallicity [Fe/H]0.26±0.10[3] dex
Rotational velocity (v sin i)5.5±1.5[3] km/s
Age6.95[3] Gyr
Other designations
KOI-204, KIC 9305831, 2MASS J20002456+4545437
Database references
SIMBADdata
KICdata

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]

The Kepler-44 planetary system[4]
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

  1. ^ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15
  2. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. ^ 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
  4. ^ a b Schneider, Jean, "Star: Kepler-44", Extrasolar Planets Encyclopaedia, archived from the original on 2014-03-04, retrieved 2011-12-06
  5. ^ "Kepler Discoveries". 2011-12-05. Archived from the original on 2010-05-27.
  6. ^ 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.
  7. ^ A Comprehensive Study of Kepler Phase Curves and Secondary Eclipses:Temperatures and Albedos of Confirmed Kepler Giant Planets


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