Binary Companion (minor Planets)
When binary minor planets are similar in size, they may be called "binary companions" instead of referring to the smaller body as a satellite. Good examples of true binary companions are the 90 Antiope and the 79360 Sila–Nunam systems.
Read more about this topic: Binary System (astronomy)
Famous quotes containing the word companion:
“Now I thought I would observe how he spent his Sunday. While I and my companion were looking about at the trees and river, he went to sleep. Indeed, he improved every opportunity to get a nap, whatever the day.”
—Henry David Thoreau (1817–1862)