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:
“Religion which lays so many restraints upon us, is a troublesome companion to those who will lay no restraints upon themselves.”
—Laurence Sterne (1713–1768)