Solar System
Dynamics &
Planetology
Group 		C/2008 J6 Hill


SSDP Cometary Note C2008J6A5-001

Comet C/2008 J6 Hill

number of observations 390
number of residuals 751
data interval 2008 May 14 — 2008 Dec. 7
rms [arcsec] 0.47
orbit quality class 1b

Osculating orbital elements (heliocentric; ecliptic J2000.0)

Epoch (TT) 20080404.0 = JD 2454560.5
time of perihelion passage (TT) 20080410.943490 ± 0.000197
perihelion distance 2.00350304 ± 0.00000282
eccentricity 1.00225379 ± 0.00000814
argument of perihelion [deg] 10.703471 ± 0.000100
longitude of the ascending node [deg] 298.178229 ± 0.000078
inclination [deg] 44.987216 ± 0.000041
inverse semimajor axis [10-6 au-1] -1124.92 ± 4.06

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) 17080128
time of perihelion passage (TT) 20080410.927250 ± 0.000174
perihelion distance 1.99507614 ± 0.00000278
eccentricity 0.99994943 ± 0.00000797
argument of perihelion [deg] 10.882624 ± 0.000100
longitude of the ascending node [deg] 298.266609 ± 0.000077
inclination [deg] 45.029402 ± 0.000040
inverse semimajor axis [10-6 au-1] 25.35 ± 4.00

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) 23021220
time of perihelion passage (TT) 20080410.639100 ± 0.000219
perihelion distance 2.00071646 ± 0.00000280
eccentricity 1.00095973 ± 0.00000799
argument of perihelion [deg] 10.606059 ± 0.000100
longitude of the ascending node [deg] 298.217398 ± 0.000077
inclination [deg] 44.988755 ± 0.000040
inverse semimajor axis [10-6 au-1] -479.69 ± 4.00


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.





Solar System Dynamics & Planetology Group, 2013. All rights reserved

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