Solar System
Dynamics &
Planetology
Group 		C/2008 C1 Chen-Gao


SSDP Cometary Note C2008C1A5-001

Comet C/2008 C1 Chen-Gao

number of observations 815
number of residuals 1544
data interval 2008 Jan. 30 — 2008 May 28
rms [arcsec] 0.36
orbit quality class 2a

Osculating orbital elements (heliocentric; ecliptic J2000.0)

Epoch (TT) 20080404.0 = JD 2454560.5
time of perihelion passage (TT) 20080416.850463 ± 0.000316
perihelion distance 1.26235106 ± 0.00000365
eccentricity 1.00001641 ± 0.00001468
argument of perihelion [deg] 180.927722 ± 0.000308
longitude of the ascending node [deg] 307.782181 ± 0.000150
inclination [deg] 61.784755 ± 0.000068
inverse semimajor axis [10-6 au-1] -13.00 ± 11.63

Note: Epoch is given in a format: yyyymmdd.d, time of perihelion passage in a format of yyyymmdd.dddddd.

Original orbital elements (barycentric; at 250 au from the Sun)

Epoch (TT) 17090412
time of perihelion passage (TT) 20080416.808453 ± 0.000373
perihelion distance 1.26642335 ± 0.00000361
eccentricity 0.99995115 ± 0.00001490
argument of perihelion [deg] 180.877694 ± 0.000311
longitude of the ascending node [deg] 307.783053 ± 0.000153
inclination [deg] 61.737844 ± 0.000069
inverse semimajor axis [10-6 au-1] 38.57 ± 11.77

Note: Values of uncertainties of original/future orbital elements were derived using a swarm of 5001 osculating orbits of VCs (including the nominal osculating orbit given above) for original/future orbital evolution calclulations and then by fitting the distribution of a given orbital element of original/future swarm of VCs to Gaussian distribution.

Original barycentric positions and velocities of 5001 VCs at 250 au from the Sun are given here   (data format), i.e. before entering the planetary zone.

Future orbital elements (barycentric; at 250 au from the Sun)

Epoch (TT) 23121028
time of perihelion passage (TT) 20080417.364965 ± 0.000264
perihelion distance 1.26280553 ± 0.00000377
eccentricity 0.99936537 ± 0.00001486
argument of perihelion [deg] 180.915146 ± 0.000311
longitude of the ascending node [deg] 307.719067 ± 0.000153
inclination [deg] 61.828908 ± 0.000068
inverse semimajor axis [10-6 au-1] 502.56 ± 11.77


Future barycentric positions and velocities of 5001 VCs at 250 au from the Sun are given here   (data format), i.e. after leaving the planetary zone.





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