Kepler-43

Kepler-43, formerly known as KOI-135, is a star in the northern constellation of Cygnus. It is located at the celestial coordinates: Right Ascension 19^h 00^m 57.8034^s, Declination +46° 40′ 05.665″.^[7] With an apparent visual magnitude of 13.996,^[3] this star is too faint to be seen with the naked eye. The Kepler-43 has a very strong starspot activity.^[5]

Kepler-43

Observation data Epoch J2000      Equinox J2000
Constellation	Cygnus[1]
Right ascension	19h 00m 57.8034s[2]
Declination	+46° 40′ 05.666″[2]
Apparent magnitude (V)	13.96[3]
Characteristics
Spectral type	G0V~G0IV[4]
Astrometry
Proper motion (μ)	RA: −2.982(14) mas/yr[2] Dec.: 0.126(14) mas/yr[2]
Parallax (π)	0.9846±0.0116 mas[2]
Distance	3,310 ± 40 ly (1,020 ± 10 pc)
Details
Mass	1.32±0.09[3] M☉
Radius	1.42±0.07[3] R☉
Luminosity	[3] L☉
Surface gravity (log g)	4.26±0.05[5] cgs
Temperature	6041±123[3] K
Metallicity [Fe/H]	0.33±0.11[3] dex
Rotation	12.851±0.053 days[6]
Rotational velocity (v sin i)	5.5±1.5[3] km/s
Other designations
Kepler-43, KOI-135, KIC 9818381
Database references
SIMBAD	data
KIC	data

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.^[8]

The planet nightside temperature was measured to be 2043⁺⁷⁹
₋₃₅₂ K.^[5]

The Kepler-43 planetary system^[4][5]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	3.23±0.19 MJ	0.0449	3.0240949±0.0000006	—	—	—