YSES 1, also known as TYC 8998-760-1, is a young star, about 27 Myr old, located 310 light years away in the constellation of Musca, with a mass 1.00±0.02 times the Sun.

[1][8] TYC 8998-760-1 b is a body which has a mass 21.8 times that of Jupiter (most likely making it a brown dwarf), and a radius of 3 RJ.

This spectrum showed that the atmosphere is dominated by water vapor and carbon monoxide.

[13] TYC 8998-760-1 c is a body with a mass of 7.2 MJ, and orbits at 320 AU (4.8×1010 km; 3.0×1010 mi), or slightly more than 11 times the Neptune-Sun distance.

The spectrum of TYC 8998-760-1 c does show direct detection of silicate clouds.