Absolute magnitude (H) and Diameter (D)
Hills Observatory: 1 January 2013 to 14 August 2018
COMETS COMETS
DEEP SKY DEEP SKY
 
The graph below shows the relationship between Absolute Magnitude (H, x-axis) and Diameter in metres (D, y-axis) for asteroids with albeidos of 0.05, 0.15, 0.25 and 0.35. In practice asteroid albeidos vary widely, from 0.02 to 0.5, but 0.15 is often used as a very approximate guide.