new members in our solar system   3 Nickels awarded! Tagged with:  academic    posted on 9 May 2007 15:13:35 IST
Eris     Discovery Discovered by:  M. E. Brown,   C. A. Trujillo,   D. L. Rabinowitz[1] Discovery date:  October 21, 2003[1]   MPC designation:  136199 Eris   Alternative names:  2003 UB313[2]   Minor planet category:  dwarf planet   TNO (scattered disc object)   Orbital characteristics Epoch March 6, 2006 (JD 2453800.5) [3]   Aphelion distance:  97.56 AU (14.60 Tm)   Perihelion distance:  37.77 AU (5.65 Tm)   Semi-major axis:  67.6681 AU (10.12 Tm) Eccentricity:  0.44177 Sidereal period:  203,500 days (557 yr)   Avg. orbital speed:  3.436 km/s Max. orbital speed:  4.126 km/s   Min. orbital speed:  2.567 km/s Mean anomaly:  197.63427°   Inclination:  44.187° Longitude of ascending node:  35.8696°   Argument of perihelion:  151.4305° Satellites:  1   Physical characteristics Equatorial radius:  1200 km ± 50 km (750 mi ± 30 mi, or 19% of Earth)   Mass:  1.6×1022kg[4]   Sidereal rotation period:  > 8 h   Albedo:  0.86 ± 0.07 Surface temp.: Kelvin  min  mean  max approx. 30 KAbsolute magnitude:  ?1.12&nbsp 0.0       ceres   Discovered by:                 Giuseppe Piazzi Discovery date:                January 1, 1801   MPC designation:            1 Ceres   Alternative names:         A899 OF; 1943 XB   Minor planet category:                         dwarf planet   main belt   Orbital characteristics Epoch November 26, 2005 (JD 2453700.5)[1]   Aphelion distance:           447,838,164 km (2.987 AU)   Perihelion distance:         381,419,582 km (2.544 AU)   Semi-major axis:              414,703,838 km (2.766 AU)   Eccentricity:                      0.080   Sidereal period:                1679.819 d (4.599 a)   Avg. orbital speed:          17.882 km/s   Mean anomaly:                108.509°   Inclination:                          10.587°   Longitude of ascending node:             80.410°   Argument of perihelion:                        73.271°   Physical characteristics   Dimensions:                       975×909 km[2]   Mass:            9.46±0.04×1020 kg[3][4]   Mean density:                   2.08 g/cm³[2]   Equatorial surface gravity:                  0.27 m/s²   Escape velocity:               0.51 km/s   Sidereal rotation period:                       0.3781 d (9.074 h)[5] Albedo:        0.113[6] Surface temp.:    Kelvin        min                 mean                ~167 K[7]   239 K[7]   Spectral type:                    G[8]   Absolute magnitude:      3.34[6]       FIRST 1 IS CERES AND SECOND IS ERIS No description given No description given	About the Author: INDIAN_ARMY19890 (1289) Blazing goIITian  229  [301 rates] total posts: 850     Offline
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comment by vinod    (posted on 9 May 2007 20:34:45 IST) wow man thats a good news !

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