Perfectum Planetarum Spring Summer collection is about exoplanet
with the name Luyten b (more commonly known as Gliese 273b).
With an Earth-like atmosphere — if it has one — Luyten b would have
an average surface temperature of about 292 K (19 °C; 66 °F), very similar to that of Earth.
Discovered alongside Gliese 273c in June 2017, Luyten b is a
Super-Earth of around 2.89 times the mass of Earth and receives only 6% more starlight than Earth,
making it one of the best candidates for habitability