TOI-4961 b: A Jupiter-Like World Around a Quiet Star

TOI-4961 is a star 695 light-years away with one known planet. The star is 8 billion years old, has a mass of 0.912 solar masses, a radius of 0.912 solar radii, and a temperature of 5380 K. Its mass and radius are smaller than the Sun's, and its temperature is cooler than the Sun's.

The planet, TOI-4961 b, was discovered in 2025 by the transit method, which detects the small dip in a star's brightness when a planet passes in front of it. Repeated dips help establish the planet's orbital period, here 7.48 days. TOI-4961 b is a Jupiter-like planet, a size class for worlds exceeding 4 times Earth's radius. Its radius of 12.3 Earth radii is larger than Earth's. Its mass of 572 Earth masses is also larger than Earth's and roughly 1.8 times Jupiter's mass. Its mean density is 1.68 g/cm³, 0.304 times Earth's.