Kepler-71

Kepler-71 is a yellow main sequence star in the constellation of Cygnus.

Kepler-71

Observation data Epoch J2000      Equinox J2000
Constellation	Cygnus[1]
Right ascension	19h 37m 57.7155s[citation needed]
Declination	46° 17′ 08.943″[citation needed]
Apparent magnitude (V)	15.06[citation needed]
Characteristics
Evolutionary stage	main sequence star[citation needed]
Spectral type	G8V
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[2]
Astrometry
Radial velocity (Rv)	0±7[citation needed] km/s
Proper motion (μ)	RA: -2.343±0.039[citation needed] mas/yr Dec.: -1.073±0.041[citation needed] mas/yr
Parallax (π)	1.0647±0.0204 mas[citation needed]
Distance	3,060 ± 60 ly (940 ± 20 pc)
Details[3][4][5]
Mass	0.923 M☉
Radius	0.816 R☉
Surface gravity (log g)	4.54±0.01 cgs
Temperature	5545 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[6]
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.^[3] The bright facula regions are even more extensive.^[7] Unlike Sun, the photosphere of Kepler-71 rotates nearly like rigid body, with differential rotation not exceeding 2%.^[5]

Planetary system

The "Hot Jupiter" class planet Kepler-71b was discovered around Kepler-71 in 2010.^[4]

The Kepler-71 planetary system^[3][5]

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