Kepler-71
G-type main-sequence star
From Wikipedia, the free encyclopedia
Kepler-71 is a yellow main sequence star in the constellation of Cygnus.
Right ascension19h 37m 27.716s[2]
Declination46° 17′ 08.941″[2]
Apparentmagnitude(V)15.06[citation needed]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 37m 27.716s[2] |
| Declination | 46° 17′ 08.941″[2] |
| Apparent magnitude (V) | 15.06[citation needed] |
| Characteristics | |
| Evolutionary stage | main sequence[citation needed] |
| Spectral type | G8V[3] |
| V−R color index | −0.29 |
| R−I color index | 0.46 |
| J−H color index | 0.377 |
| J−K color index | 0.457 |
| Variable type | ROT[4] |
| Astrometry | |
| Radial velocity (Rv) | −23.88±0.02[5] km/s |
| Proper motion (μ) | RA: −2.379±0.021 mas/yr[2] Dec.: −0.983±0.022 mas/yr[2] |
| Parallax (π) | 1.0647±0.0204 mas[2] |
| Distance | 3,060 ± 60 ly (940 ± 20 pc) |
| Details[6][3][7] | |
| Mass | 0.923 M☉ |
| Radius | 0.816 R☉ |
| Surface gravity (log g) | 4.54±0.01 cgs |
| Temperature | 5,545 K |
| Metallicity [Fe/H] | 0.22 dex |
| Rotation | period 20 days |
| Age | 2.5-4 Gyr |
| Other designations | |
| KOI-217, BOKS 40959, KIC 9595827, 2MASS J19392772+4617090, Gaia DR2 2080095679848047872[8] | |
| Database references | |
| SIMBAD | data |
Star characteristics
Kepler-71 is enriched by heavy elements at 170% of Sun metallicity, young and has a very prominent starspot activity. Starspots are covering about 40% of star surface at transit latitudes, each planetary transit passing over an average six starspots.[6] The bright facula regions are even more extensive.[9] Unlike Sun, the photosphere of Kepler-71 rotates nearly like rigid body, with differential rotation not exceeding 2%.[7]
Planetary system
The "Hot Jupiter" class planet Kepler-71b was discovered around Kepler-71 in 2010.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | — | 0.05029+0.00002 −0.00006 |
3.905079476+0.000008 −0.000009 |
0 | 89.8+0.2 −0.4 |
1.1987±0.0044 RJ |
