Kojima-1Lb (TCP J05074264+2447555) is an exoplanet discovered through the microlensing method. The host star lens was discovered by the amateur astronomerTadashi Kojima (小嶋正).[3][4][5] At the time of its discovery it was the planet around the brightest microlensing host star and consequently around a nearby star,[2] as opposed to most of the microlensing planets, which are usually found around distant and inaccessible host stars. Kojima-1Lb is a mildly cold Neptune[2] around a red dwarf located 429±21 pc[6] from the solar system.
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