Kepler-41

Kepler-41 or KOI-196 is a star in the constellation Cygnus. It is a G-type main-sequence star, like the Sun, and it is located about 3,680 light-years (1130 parsecs) away.[1] It is fairly similar to the Sun, with 115% of its mass, a radius of 129% times that of the Sun, and a surface temperature of 5,750 K.[3] Search for stellar companions to Kepler-41 in 2013-2014 has yielded inconclusive results, compatible with Kepler-41 being the single star.[5]

Kepler-41
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 38m 03.1746s[1]
Declination +45° 58′ 53.877″[1]
Apparent magnitude (V) 14.5[2]
Characteristics
Spectral type G2V[3]
Astrometry
Radial velocity (Rv)−27.066±0.008[3] km/s
Proper motion (μ) RA: 3.037±0.041[1] mas/yr
Dec.: 2.999±0.046[1] mas/yr
Parallax (π)0.8864 ± 0.0224[1] mas
Distance3,680 ± 90 ly
(1,130 ± 30 pc)
Details[3]
Mass1.15±0.04 M☉
Radius1.29±0.02 R☉
Surface gravity (log g)4.278±0.005 cgs
Temperature5750±100 K
Metallicity [Fe/H]0.38±0.11 dex
Rotational velocity (v sin i)6±2 km/s
Age4.4+1.3
−1.1 Gyr
Other designations
KIC 9410930, KOI-196, UCAC3 272-156898, 2MASS J19380317+4558539, Gaia DR2 2080061942886335744[4]
Database references
SIMBADdata
KICdata

Planetary system

In 2011, the planet Kepler-41b was discovered in orbit around the star. The planet orbits extremely close to Kepler-41, completing an orbit once every 1.86 days. Despite it receiving a high amount of radiation from Kepler-41, the radius of the Kepler-41b was initially believed to be less than that of Jupiter making it unusual for a hot Jupiter however later observations showed an inflated radius similar to other hot jupiters.[3] Kepler-41b is also quite reflective, with a geometric albedo of 0.30.[6]

The Kepler-41 planetary system[3]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.56±0.08 MJ 0.03101±0.0004 1.85555820±0.00000052 0 (fixed) 82.51±0.09° 1.29±0.02 RJ

References
  1. 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.
  2. "Notes on Kepler-41 b". Retrieved 21 January 2017.
  3. Bonomo, A. S.; et al. (2015). "Improved parameters of seven Kepler giant companions characterized with SOPHIE and HARPS-N". Astronomy and Astrophysics. 575. A85. arXiv:1501.02653. Bibcode:2015A&A...575A..85B. doi:10.1051/0004-6361/201323042. S2CID 119230291.
  4. "KOI-952". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 21 January 2017.
  5. Esteves, Lisa J.; Mooij, Ernst J. W. De; Jayawardhana, Ray (2014), "Changing Phases of Alien Worlds: Probing Atmospheres Ofkeplerplanets with High-Precision Photometry", The Astrophysical Journal, 804 (2): 150, arXiv:1407.2245, doi:10.1088/0004-637X/804/2/150, S2CID 117798959
  6. Santerne, A.; et al. (2011). "SOPHIE velocimetry of Kepler transit candidates IV. KOI-196b: a non-inflated hot Jupiter with a high albedo". Astronomy and Astrophysics. 536. A70. arXiv:1108.0550. Bibcode:2011A&A...536A..70S. doi:10.1051/0004-6361/201117807. S2CID 119025355.
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