TOI 5817 b

Exoplanet, sub-neptune

Distance from the star: 0.1223 AU

Orbit around star: 15.61031 days +

Eccentricity: 0.20

Mass: 10.3 M Earth

Size: 3.08 R Earth | 0.3 R Jupiter

Density: 1944 kg/m3 | 35 % Earth

Temperature: 950 K | 677 °C

Year of discovery: 2025 (transit)

Other designations of this exoplanet
TOI-5817 b

TOI 5817 system structure

Exoplanet TOI 5817 b orbits star TOI 5817, which has lower mass than Sun. It is the only known exoplanet orbiting this star


	TOI 5817
		TOI 5817 b	0.12 AU	10.3 M⊕	3.1 R⊕	15.6 days

When comparing to the Solar system planets, TOI 5817 b has 71 % of mass of Uranus and it orbits its star closer than Mercury orbits the Sun.

	Mercury	Venus	Earth	Mars	Jupiter	Saturn	Uranus	Neptune
Mass	187.27	12.64	10.3	93.64	0.03	0.11	0.71	0.6
Size	8.04	3.24	3.08	5.81	0.27	0.34	0.77	0.81
Density	0.36	0.37	0.35	0.48	1.56	2.79	1.55	1.12
Distance	0.31	0.17	0.12	0.08	0.02	0.01	0.01	0
Temperature	2.16	1.29	3.3	4.57	5.83	7.14	12.18	13.19

Habitable zone of the star: 1.4 - 2 AU

The planet is too hot to sustain liquid water.

The planet is bigger than Earth and smaller than Neptune. Its average density 1944 kg/m3 points to a hot gas planet.