Leonida

Leonida (Леонида): the home planet of Leoniders, a humanoid alien race that lives in a perfect symbiosis with the planet's biosphere. Leonida is located in EN-23 system, its only moon is called Palmyra (Пальмира) and its day-night cycle lasts a bit longer than 27 hours. This planet was apparently the first one with an Earth-like climate suitable for humans' existence. Perhaps, the planet was named after its discoverer, Leonid Gorbovsky. Discovered in 2133 AD.