Kepler-41
G-type main sequence star in the constellation Cygnus
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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 3,510 light-years (1,080 parsecs) away.[2] 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.[5] Search for stellar companions to Kepler-41 in 2013-2014 has yielded inconclusive results, compatible with Kepler-41 being the single star.[7]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 38m 03.1747s[2] |
| Declination | +45° 58′ 53.877″[2] |
| Apparent magnitude (V) | 14.5[3] |
| Characteristics | |
| Evolutionary stage | subgiant[4][2] |
| Spectral type | G2V[5] |
| Astrometry | |
| Radial velocity (Rv) | −27.066±0.008[5] km/s |
| Proper motion (μ) | RA: 3.001(19) mas/yr[2] Dec.: 2.965(20) mas/yr[2] |
| Parallax (π) | 0.9283±0.0156 mas[2] |
| Distance | 3,510 ± 60 ly (1,080 ± 20 pc) |
| Details | |
| Mass | 1.15±0.04[5] M☉ |
| Radius | 1.36±0.07[4] R☉ |
| Luminosity | 1.93[4] L☉ |
| Surface gravity (log g) | 4.12[4] cgs |
| Temperature | 5,630[4] K |
| Metallicity [Fe/H] | 0.38±0.11[5] dex |
| Rotational velocity (v sin i) | 6±2[5] km/s |
| Age | 4.38+0.85 −0.93[4] Gyr |
| Other designations | |
| KIC 9410930, KOI-196, UCAC3 272-156898, 2MASS J19380317+4558539, Gaia DR2 2080061942886335744[6] | |
| Database references | |
| SIMBAD | data |
| KIC | data |
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.[5] Kepler-41b is also quite reflective, with a geometric albedo of 0.30.[8]
| 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 |
