I am creating an Earthlike planet with a year length of 515 Earth days and 9 Earth hours. I am aware that Kepler's third law of planetary motion states that warmer stars are needed for longer orbital periods with an Earthlike climate.
However, my planet differs from Earth because its climate resembles Earth during the last glacial maximum, and its seasons are caused by fluctuations in the distance between the planet and the star rather than axial tilt (it has a near-zero axial tilt of only 0.2 degrees). How far would the planet have to orbit from the star on average? My planet has a mass of 1.18 times Earth's mass, if that affects anything.