The distance modulus μ μ = m − − M is the difference between the apparent magnitude m (ideally, corrected from the effects of interstellar absorption) and the absolute magnitude M of an astronomical object. It is related to the luminous distance d in parsecs by: log 10 ⁡ ⁡ ( d ) = 1 + μ μ 5 μ μ = 5 log 10 ⁡ ⁡ ( d ) − − 5