Elenin au plus proche de la Terre le 16 et 17 octobre : accrochez vos ceintures !





Ci-dessous, pour vous confirmer que la comète (?) n’a pas été désintégrée, le rapport de la Nasa



C/2010 X1 (Elenin)
Classification: Hyperbolic CometSPK-ID: 1003113
Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]

[ hide orbit diagram ]

Orbit Diagram
Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet was implemented using 2-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances. For accurate long-term ephemerides, please instead use our Horizons system.
Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided byOsamu Ajiki(AstroArts), and further modified byRon Baalke(JPL).


Orbital Elements at Epoch 2455650.5 (2011-Mar-30.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)

 Element Value Uncertainty (1-sigma)   Units 
e 1.000064048145741 1.8591e-06
a -7532.31733028152 218.63 AU
q .4824309581374332 2.4495e-06 AU
i 1.839475154920383 4.7959e-05 deg
node 323.2338494998166 0.00094556 deg
peri 343.798953487708 0.00093397 deg
M 359.999751654787 1.0812e-05 deg
tp 2455815.219354417315
0.00037603 JED
period n/a
n 1.507686900885618E-6 6.5641e-08 deg/d
Q n/a n/a AU
Orbit Determination Parameters

   # obs. used (total)   2209
   data-arc span   234 days
   first obs. used   2010-12-10
   last obs. used   2011-08-01
   planetary ephem.   DE405
   SB-pert. ephem.   SB405-CPV-2
   fit RMS   .58415
   data source   ORB
   producer   Otto Matic
   solution date   2011-Sep-14 21:24:26

Additional Information

 Earth MOID = .030627 AU
 T_jup = 0.861

[ hide covariance matrix ]

Orbit Covariance (6×6)

e q tp node peri i
e 3.456207263765826E-12 1.200984161232074E-12 -5.192195588897656E-10 -1.188784682159179E-10 -1.54407534555451E-10 -6.279889138301894E-12
q 1.200984161232074E-12 6.000089059503247E-12 -6.668591282280052E-10 -4.086490262574901E-10 -4.543306299187816E-11 -2.516011401592897E-11
tp -5.192195588897656E-10 -6.668591282280052E-10 1.414008650272228E-7 4.700030314080427E-8 2.697170502885165E-8 2.922576770841947E-9
node -1.188784682159179E-10 -4.086490262574901E-10 4.700030314080427E-8 8.940795864805675E-7 -8.607598023180779E-7 4.466869390853531E-8
peri -1.54407534555451E-10 -4.543306299187816E-11 2.697170502885165E-8 -8.607598023180779E-7 8.72298754793263E-7 -4.267381663020393E-8
i -6.279889138301894E-12 -2.516011401592897E-11 2.922576770841947E-9 4.466869390853531E-8 -4.267381663020393E-8 2.30009065073777E-9


Ephemeris | Orbit Diagram | Orbital Elements | Physical Parameters | Close-Approach Data ]


Physical Parameter Table

Parameter Symbol Value Units Sigma Reference Notes
comet total magnitude M1 10.4 mag 0.9 36 from 354 observations, assumed slope, autocmod 2.5a
comet total magnitude slope K1 11. n/a 36 autocmod 2.5a
comet nuclear magnitude M2 13.7 mag 0.8 36 from 1786 observations, autocmod 2.5a
comet nuclear magnitude slope K2 5. n/a 36 autocmod 2.5a
comet nuclear phase coefficient PC 0.03 n/a 36 autocmod 2.5a

[ hide close-approach data ]

Source Wikistrike