The exoplanet gets its title as it is suspected to be around three times the mass of Earth, with a size 50% larger than our home planet.
“We report the discovery of TOI-561, a multi-planet system in the galactic thick disk that contains a rocky, ultra-short period planet (USP),†the study mentions.
"For every day you're on Earth, this planet orbits its star twice," said Stephen Kane, study co-author and astrophysicist at the University of California, Riverside, in a statement.
Though since astronomers know that the rocky planet and its star form a 10 billion years old system, they wonder if the planet harboured life at any point in its past.
The study highlights two other planets orbiting the star, which are both likely gaseous and larger than TOI-561b.