description TOI-561 Overview
TOI-561 is an old, metal-poor star in the constellation Sextans, located roughly 280 light-years from Earth. It is a K-type star with a system of transiting exoplanets, including TOI-561 b, an ultra-short-period rocky planet that completes an orbit in less than one Earth day. The system is scientifically useful for studying how planets formed around stars belonging to an older, chemically distinct population of the Milky Way.
help TOI-561 FAQ
What makes the star TOI-561 scientifically interesting?
TOI-561 is unusually old and metal-poor, meaning it has a lower proportion of elements heavier than hydrogen and helium than most planet-hosting stars. This challenges assumptions about how rocky planets form around metal-poor stars.
How long does planet TOI-561 b take to orbit its star?
TOI-561 b is an ultra-short-period planet that completes a full orbit in less than one Earth day. Because it orbits so close to its host star, it likely has an extremely high surface temperature.
How far away is TOI-561 from Earth?
TOI-561 is located approximately 280 light-years from Earth in the constellation Sextans. It is classified as a K-type star, which is cooler and smaller than the Sun.
What type of star is TOI-561 and why does it matter for exoplanet research?
TOI-561 is a K-type star with a very low metallicity, suggesting it formed early in the history of the universe. The presence of rocky planets around such an old, metal-poor star provides valuable data for models of planet formation across cosmic time.
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