Overview

Kepler-62f is classified as a super-Earth and is an exoplanet orbiting within the nominal habitable zone of the K-type star Kepler-62. The planetary system was discovered in data from the Kepler spacecraft and announced in 2013 by NASA. Kepler-62f lies approximately 990 light-years from Earth, a distance sometimes expressed as about 300 parsecs, and is located in the constellation Lyra. It is the outermost of five small planets detected around this star.

Physical characteristics

The planet's radius is estimated to be roughly 1.4 times that of Earth, a size at which a predominantly rocky composition is plausible though not guaranteed. No precise mass measurement has been obtained because the host star is faint and distant, so the planet's density and internal structure remain uncertain. Kepler-62 is a cooler, smaller star than the Sun; as a result Kepler-62f receives less stellar energy than Earth and has a longer orbital period than Earth. Without a substantial atmosphere, its equilibrium temperature would be low; with a thicker greenhouse atmosphere, surface temperatures could be moderate.

Discovery and validation

Kepler-62f was detected by the transit method, in which small, periodic dips in stellar brightness indicate planets passing in front of their star. The candidate passed statistical validation tests and was announced as a validated planet along with others in the same system. Because the star is distant and relatively faint, follow-up observations such as radial-velocity mass determinations and atmospheric spectroscopy are extremely challenging with current facilities.

Habitability considerations

Being located in the habitable zone means Kepler-62f might be able to host liquid water on its surface, but that potential depends on many factors. Important variables include the planet's actual mass and composition, the presence and composition of an atmosphere, volatile inventory (water and gases), and its geologic and magnetic activity. Climate models show a range of possible outcomes: with a thin atmosphere the surface would be cold, while a denser, greenhouse-rich atmosphere could permit temperate conditions and potentially open-water regions. Tidal effects, axial tilt, and the planet's formation history also influence long-term habitability, but these properties are not yet observable for this target.

Context and scientific importance

  • Kepler-62f is among the earlier small planets found in a star's habitable zone and has been the subject of theoretical climate and habitability studies.
  • Its size near the transition between Earth-size and larger super-Earths makes it useful for studies of how planet composition and atmospheres change with radius.
  • Although informal nicknames have appeared in outreach materials, the formal catalogue designation for the planet remains KOI‑701.04 and it is commonly discussed in the literature by its Kepler name.

Observational prospects

Because Kepler-62f is distant and orbits a faint star, direct observational characterization is limited. Future observatories with greatly increased sensitivity and new techniques for high-contrast imaging and spectroscopy may be able to study similar planets, but Kepler-62f itself will remain a challenging target. The system nevertheless serves as an important example of the class of small, temperate worlds that missions and telescopes aim to survey and characterize.

Further reading

Summary material on planet types and habitability can provide broader context for Kepler-62f. For basic definitions and concepts see resources on super-Earths, general information about exoplanets, and descriptions of the habitable zone. Historical and mission context is provided by pages about NASA and the Kepler spacecraft. For distance units and the constellation location, consult references to parsecs and the constellation Lyra, and for Earth-based perspective see general material about Earth.

Kepler-62f remains an instructive example in exoplanet science: a small, likely rocky world in a temperate orbit whose detailed properties are unknown but whose existence helps define targets for future study.