About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 33. Chapters: 2 Pallas, 4 Vesta, 20000 Varuna, 28978 Ixion, 90377 Sedna, 50000 Quaoar, 90482 Orcus, List of dwarf planet candidates, 10 Hygiea, (47171) 1999 TC36, (55637) 2002 UX25, (208996) 2003 AZ84, 38628 Huya, (225088) 2007 OR10, (55565) 2002 AW197, (84522) 2002 TC302, (82075) 2000 YW134, (84922) 2003 VS2, 2009 YE7, (15874) 1996 TL66, 2010 EK139, (202421) 2005 UQ513, (119951) 2002 KX14, 2003 UZ413, (42301) 2001 UR163, 2003 QX113, 2006 QH181, (145480) 2005 TB190, (174567) 2003 MW12, (90568) 2004 GV9, 2010 KZ39, 2005 QU182, 2010 RE64, (120347) Salacia, (35671) 1998 SN165, 2002 MS4, 2008 ST291, (229762) 2007 UK126, (119979) 2002 WC19, 2007 JH43, (145452) 2005 RN43, 19521 Chaos, (26375) 1999 DE9, 2001 QF298, (145451) 2005 RM43, (120132) 2003 FY128, (230965) 2004 XA192, 2003 QW90, (120348) 2004 TY364, (144897) 2004 UX10, 1999 CD158, 2007 JJ43. Excerpt: 90377 Sedna is a trans-Neptunian object discovered in 2003, which currently lies about three times as far from the Sun as Neptune. For most of its orbit however, it is even further from the Sun, with its aphelion estimated at 960 astronomical units (32 times Neptune's distance); this makes it one of the most distant known objects in the Solar System other than long-period comets. Roughly two-thirds the size of Pluto, Sedna is theoretically large enough to be rounded by its own gravity, and thus would qualify as a dwarf planet under current definitions. However, its distance from the Sun makes determining its shape difficult. Spectroscopy has revealed that Sedna's surface composition is similar to that of some other trans-Neptunian objects, being largely a mixture of water, methane and nitrogen ices with tholins. Its surface is one of the reddest in the Solar System. Sedna's exceptionally long and elongated orbit, taking approximately 11,400 years to complete, and distant point of cl...
