TOI-791
TOI-791 — a yellow-white star about 1,100 light-years away in Volans, with two of the puffiest planets known. Both are the size of Jupiter but weigh barely ten Earths, giving them densities around a twentieth of water's — and unlike the other known super-puffs, which hug their stars, these two are cool and far out. Descend to see them.
Science
Classification
- Type
- Planetary system
- Distance
- ~1,098 light-years · its real distance from the Sun
- Explore
- Descend to see the star and its confirmed planets
How we know
- Note
- A real star system, shown at its measured position in the galaxy. Its star and confirmed planets — their measured sizes and how each was found — are on the cards inside; descend to explore them. Distances follow Gaia parallax; planet data follow the NASA Exoplanet Archive.
Discovery & history
- Method
- Telescope
- Name
- A TESS Object of Interest number, assigned when the spacecraft's light curve was flagged for follow-up; the star has no proper name.
NASA's TESS spacecraft flagged two sets of dips in this star's light — the first in 2019, the second in 2024 — as candidates 791.01 and 791.02. Follow-up published in 2026 confirmed both as planets and corrected the second one's period, which the candidate list had recorded as four times too long.
Images
No telescope has imaged either planet, and no artist's concept of this system has been published — it was confirmed only in 2026. The star's sky chart is on its own card; the worlds are known from their transits and their pull on the star alone.