L 98-59 f is a high-priority “Super-Earth” located approximately 34.6 light-years away in the southern constellation Volans. It orbits a bright M-dwarf star, which makes it an excellent candidate for detailed study.

Key Physical Characteristics

• Planet Type: Terrestrial (rocky) world.
• Mass: It is roughly 2.5 to 3 times the mass of Earth.
• Orbit: It completes one orbit every 12.8 Earth days.
• The Star: L 98-59 is a bright red dwarf. Because the star is so bright relative to its size, it provides a “backlight” that helps scientists see the atmosphere of its planets more clearly.

Habitability & Environment

In Lisa Kaltenegger’s study, L 98-59 f is noted for its potential “temperate” nature:

• Location: It sits right in the Habitable Zone, between its hotter inner siblings and the cold vacuum of space.
• Energy Intake: It receives a level of starlight that could support liquid water, depending on its atmospheric thickness.
• Atmosphere: Scientists are particularly interested in whether this planet is a “dry” rocky world or a “Water World” with a deep global ocean. Early data suggests it might have a significant amount of water (up to 30% of its mass).
• Tidal Locking: Like most planets on this list, it is likely tidally locked, with a permanent “day” side and “night” side. 

Scientific Significance

• The “Golden” System: L 98-59 is a multi-planet system (with at least 4 confirmed planets). It is one of the closest systems to Earth where we can study several rocky planets at once to see how they differ in composition.
• JWST Target: Because the star is so bright and the planet is relatively close, it is a primary target for the James Webb Space Telescope to “sniff” the atmosphere for water vapor, carbon dioxide, and methane.
• Testing Planet Formation: This system helps Kaltenegger and her team understand how small, rocky planets form around red dwarfs and whether they can hold onto their water over billions of years.

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Published @ March 24, 2026 9:20 am