The Trans-Neptunian object Sedna has an extremely large semimajor axis. In the year 2004, it was estimated to be 480 AU. What is the period of Sedna's orbit, measured in Earth years? Comet phaethon has an orbital period of 1.43 years. What is the average distance ...
(1) The Ryugu progenitor planetesimal forms via the accretion of silicate dust and water-rich ice within the trans-Neptunian disk (TND). (2) aqueous alteration leads to the alteration of the silicate dust and the formation of new minerals. Organic matter accreted within the ice is also ...