Information About

90377 Sedna
  CATEGORIES ABOUT 90377 SEDNA
   
trans-neptunian objects
   
sedna
   
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  Name 90377 Sedna
  Caption Sedna is located in the center of the green circle
  Discovery yes
  Discoverer M Brown ,<br/> C Trujillo ,<br/> D Rabinowitz
  Discovered November 14 , 2003
  Mp Name 90377 Sedna
  Mp Category Trans-Neptunian Object
  Epoch September 26 , 1990 ( JD 24481605)
  Semimajor 78668×10<sup>13</sup> M (52586 AU )
  Perihelion 11393×10<sup>13</sup> m (76156 AU)
  Aphelion 1459×10<sup>14</sup> m (97556 AU)
  Eccentricity 0855
  Period around 4404480 D (1205906 A )
  Inclination 11934 °
  Asc Node 144514°
  Arg Perihelion 311123°
  Mean Anomaly 357457°
  Avg Speed 104 km/ S
  Physical Characteristics yes
  Dimensions 1180&ndash1800 Km
  Radius 590-900 km
  Mass 17-61×10<sup>21</sup> Kg
  Density 20 g/ Cm³
  Surface Grav 033-050 m/s&2
  Escape Velocity 062-095 km/s
  Sidereal Day 042 d (10 h) <sup>1</sup>
  Spectral Type (red) B-V=124 V-R=078 1
  Abs Magnitude 16
  Albedo >02


  Observations From "http://wwwinformationdelightinfo/information/entry/Chile" class="copylinks">Chile show that Sedna is one of the reddest objects in the solar system, nearly as red as Mars Unlike Pluto and Charon, Sedna appears to have very little methane ice or water ice on its surface Chad Trujillo and his colleagues at the Gemini Observatory in Hawaii suggest that Sedna's dark red color is caused by a Hydrocarbon sludge, or Tholin , like that found on 5145 Pholus {{cite weburl=http://wwwnewscientistcom/articlensid=dn7272