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Proper Name	None
Designations	Kepler-138 b, KOI-314 d, KOI-314.03, KIC 7603200 b, KIC 7603200.03
Classification	Earth-mass planet (sub-Earth)
Orbital Period	10 days, 8 hours
Mean Distance from Kepler-138	11.2 million km 0.075 AU
Mass	0.07 x Earth
Diameter	0.52 x Earth
Temperature	Not known
Parent star	Kepler-138, red dwarf in Lyra
Other planets in this system	Kepler-138 c, Earth-mass planet Kepler-138 d, Earth-mass planet Kepler-138 e, sub-Earth (unconfirmed)

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