"The “nine planets” in the Hosokawa family crest are actually not all planets or even all celestial bodies. The concept comes from Indian cosmology–the nine grahas. See Wikipedia entry on same. The specific planets (or not) are listed toward the bottom, next to the deities who represent them. http://en.wikipedia.org/wiki/Navagraha
Melissa Rinne, the museum’s assistant curator of Japanese Art.