Y145lles

Y145lles is a fictional exoplanet described in a science fiction planetary catalog. In the imagined universe, it orbits a sunlike star within the Y-array of the Echelle Sector, situated roughly sixty light-years from the Solar System.

Discovery and naming: In the lore, Y145lles was identified by transit photometry during the Nexa Astronomical Survey in the early 22nd century. The provisional designation Y145-lles reflects its placement in the Y145 group of rocky planets, with the suffix “lles” serving as a fictional convention for terrestrial worlds in this catalog.

Physical characteristics: Y145lles is depicted as a terrestrial world with a radius about 1.2 times that of Earth and a mass near 1.4 Earth masses, yielding a density consistent with silicate rocks and iron. Its surface features a mix of low-relief continents and shallow seas, bounded by basaltic crust. The atmosphere is described as moderate, with nitrogen and carbon dioxide as major components and trace gases that contribute to a variable, copper-toned twilight.

Orbit and climate: The planet completes an orbit every roughly 290 days at an average distance near 0.95 astronomical units. Its axial tilt is portrayed as moderate, producing seasons that could support regional climates suitable for stable liquid water under modest greenhouse effects.

Significance: Within the fictional setting, Y145lles serves as a reference case for discussions of planet formation around sunlike stars and the range of climates possible in compact orbits. It appears in scholarly and encyclopedic entries within the universe’s scientific literature, where it is used to illustrate concepts of habitability and observational detection in exoplanet studies.