Orbit of C/2012 S1 ISON
Pure gravitational nominal solution for weighted data (Solution A5-1):
Observational arc: 2011 Dec. 28 - 2013 Jan. 24
Number of observations: 1662
RMS: 0.27 arcsec (3263 residuals used, 1.8% rejected residuals )
Heliocentric osculating orbit
Epoch Perihelion time q e ω Ω i
2012 11 28 20131128.8113 0.01251395 1.00000281 345.50171 295.74953 61.79227
± 0.0018 0.00000037 0.00000008 0.00015 0.00024 0.00137
NG parameters:
A1 = 0
A2 = 0
A3 = 0
Barycentric nominal original orbit (at 250 AU from the Sun), obtained from the above elements
Epoch Perihelion time q e ω Ω i
1717 03 20 20131128.7260 0.01238276 0.99999964 345.52334 295.77190 61.79007
± 0.0028 0.00000037 0.00000012 0.00015 0.00024 0.00137
1/aori = (+29.02 ± 6.63)×10-6 AU-1
For comparison, the gravitational nominal solution for non-weighted data (Solution A1-1):
Observational arc: 2011 Dec. 28 - 2013 Jan. 24
Number of observations: 1662
RMS: 0.40 arcsec (3257 residuals used, 2.0% rejected residuals )
Heliocentric osculating orbit
Epoch Perihelion time q e ω Ω i
2012 11 28 20131128.81620994 0.01251389700 1.00000261192 345.50171230 295.74978565 61.79076987
± 0.00219781 0.00000042650 0.00000009356 0.00015987 0.00025346 0.00143148
NG parameters:
A1 = 0
A2 = 0
A3 = 0
Barycentric nominal original orbit (at 250 AU from the Sun)
Epoch Perihelion time q e ω Ω i
1716 12 30 20131128.73100821 0.01238269619 0.99999944347 345.52334437 295.77216198 61.78857615
± 0.00224276 0.00000042904 0.00000008297 0.00015811 0.00025378 0.00143237
1/aori = (+44.93 ± 7.49)×10-6 AU-1
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