The host star lens was discovered by the amateur astronomer Tadashi Kojima (小嶋正).
Kojima-1Lb is a mildly cold Neptune[2] around a red dwarf located 429±21 pc[6] from the solar system.
[2] The discovery group of the planetary feature nicknamed the microlensing event Feynman-01 in honour of the Osservatorio Astroficico R.P.
Feynman Observatory to first establish that TCP J05074264+2447555 was a binary lens with a hint to a new planetary system.
Together with Gaia22dkvL, Kojima-1L is located outside the bulge of the Milky Way, representing a small growing sample of microlensing planets discovered in less crowded regions.
This translates into a semi-major axis of about 1.1 astronomical units, which was inside and near the ice line at the younger age of the system.
As the snow line decreased, it might have crossed the orbit of the planet at around 2.2 Myrs after the Kojima-1L system has formed.