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

Publié par Brujitafr sur 15 Octobre 2011, 06:23am

Catégories : #AIR DU TEMPS

Forts séismes et éruptions volcaniques dans les prochains jours ?

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

http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=elenin;orb=1;cov=1;log=0;cad=1#cad

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
t_p	2455815.219354417315 (2011-Sep-10.71935442)	0.00037603	JED
period	n/a n/a	n/a n/a	d yr
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