Solar System
Dynamics &
Planetology
Group 		C/2009 O4 Hill


SSDP Cometary Note C2009O4A5-001

Comet C/2009 O4 Hill

number of observations 785
number of residuals 1522
data interval 2009 July 30 — 2009 Dec. 14
rms [arcsec] 0.39
orbit quality class 1b

Osculating orbital elements (heliocentric; ecliptic J2000.0)

Epoch (TT) 20090831.0 = JD 2455074.5
time of perihelion passage (TT) 20100101.277442 ± 0.001055
perihelion distance 2.56378209 ± 0.00000799
eccentricity 1.00132657 ± 0.00001263
argument of perihelion [deg] 223.732314 ± 0.000350
longitude of the ascending node [deg] 172.936519 ± 0.000026
inclination [deg] 95.823000 ± 0.000156
inverse semimajor axis [10-6 au-1] -517.43 ± 4.92

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) 17080630
time of perihelion passage (TT) 20091231.718738 ± 0.001011
perihelion distance 2.55680478 ± 0.00000794
eccentricity 0.99985692 ± 0.00001255
argument of perihelion [deg] 223.896771 ± 0.000350
longitude of the ascending node [deg] 172.974938 ± 0.000027
inclination [deg] 95.832953 ± 0.000156
inverse semimajor axis [10-6 au-1] 55.96 ± 4.91

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) 23100307
time of perihelion passage (TT) 20091231.874452 ± 0.001067
perihelion distance 2.56213566 ± 0.00000799
eccentricity 1.00015268 ± 0.00001256
argument of perihelion [deg] 223.685205 ± 0.000349
longitude of the ascending node [deg] 172.979811 ± 0.000026
inclination [deg] 95.791209 ± 0.000156
inverse semimajor axis [10-6 au-1] -59.59 ± 4.90


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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