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ISON

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C/2012 S1 (ISON)

Orbital elements

Semi-major axis
-2,446.893 AU
Eccentricity
1
Inclination
62.16°
Perihelion
0.012 AU
Longitude of ascending node
295.69°
Argument of periapsis
345.54°
Epoch · J2000
JD 2456625.26453 (perihelion)
Orbit class · HYP
Hyperbolic comet
Earth MOID · 8.9 LD
0.023 AU
Tisserand (Jupiter)
0.065

Orbit quality

Observations used
6,684
Data arc
784 days
First observed
30 September 2011
Last observed
22 November 2013
Residual RMS
0.57 ″
Solution · Otto Matic
21 November 2025

Visual & observation

Absolute magnitude (H)
10.4
Total magnitude M₁ · K₁ 4.5
10.4

Discovery & classification

Also known as 2012 S1

Named

Sources