The discovery of exoplanets has revealed that planetary systems across the galaxy are far more varied than astronomers once imagined. Some worlds are enormous gas giants orbiting far from their stars, while others are compact rocky bodies exposed to conditions far more extreme than anything found in the Solar System. Kepler-1982 b belongs to this second category: a remarkably small rocky exoplanet orbiting dangerously close to its parent star and completing an entire year in less than four Earth days.
Kepler-1982 b belongs to the vast catalogue of planets discovered through data collected by NASA’s Kepler mission, a project that transformed astronomy by proving that planets are common throughout the Milky Way. Although many Kepler discoveries became famous for possible habitability, Kepler-1982 b tells a different story—one about extreme environments, compact planetary systems, and the surprising variety of terrestrial worlds.
The planet orbits the star Kepler-1982, located roughly 559 parsecs, or about 1,823 light-years, from Earth in the direction of the constellation Cygnus. The host star is an F-type star, hotter and somewhat larger than the Sun, with an estimated surface temperature near 6,318 K.
Kepler-1982 b itself is notably small. Current measurements indicate a radius of approximately 0.77 times Earth’s radius and an estimated mass of about 0.381 Earth masses, placing it among the smaller confirmed rocky exoplanets known. These values suggest a terrestrial composition rather than a gas-rich structure.
Its orbit is what makes the planet especially dramatic. Kepler-1982 b circles its star at a distance of only about 0.051 astronomical units—just over five percent of the Earth–Sun distance. At that proximity, the planet completes one orbit in approximately 3.8 days. Its measured orbital eccentricity is effectively zero, meaning the orbit is nearly circular and the world receives a steady, relentless flood of stellar energy.
That closeness creates conditions far beyond anything found on Earth. Estimates derived from observational data place the planet’s equilibrium temperature above 1,200 K, with some modelling approaches suggesting even higher values depending on assumptions about reflectivity and atmospheric effects. Such temperatures are hot enough to eliminate any possibility of liquid water on the surface and make long-term atmospheric retention difficult.
Kepler-1982 b was confirmed in 2023, although the underlying observations originated from the Kepler telescope’s earlier survey data. Like many modern exoplanet confirmations, its path from candidate to confirmed planet reflects improvements in data analysis and validation techniques rather than a brand-new observation campaign. The object had previously appeared in Kepler candidate catalogues under the designation KOI-4157.01 before later confirmation work established its planetary status.
The planet was detected using the transit method, the same technique that powered most of Kepler’s discoveries. When Kepler-1982 b passes between its star and our line of sight, it causes a tiny and regular dip in the star’s brightness. By measuring the depth and timing of those dips, astronomers can estimate the planet’s size, orbital period, and aspects of the planetary system’s geometry.
At first glance, a hot, small world orbiting so close to its star might seem scientifically unremarkable compared with potentially habitable exoplanets. Yet planets like Kepler-1982 b are essential to understanding planetary evolution. They help researchers study how intense radiation influences rocky surfaces, how close-in planets lose atmospheres over time, and how planetary systems become arranged into the compact architectures that appear common across the galaxy.
Kepler-1982 b also illustrates a broader lesson emerging from exoplanet science: Earth is not the default outcome of planet formation. Many rocky worlds are smaller, hotter, denser, faster, and stranger than anything in our own neighbourhood. Each discovery expands the map of what planets can be.
Kepler-1982 b may never become a destination for dreams of life beyond Earth, but it remains a valuable scientific laboratory—a tiny world enduring extraordinary heat while offering astronomers another clue about how planetary systems assemble and evolve across the universe.
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