C/2006 Q1 McNaught
more info
Comet C/2006 Q1 was discovered on 20 August 2006 by Robert H. McNaught (Siding Spring Survey); that is almost 2 years before its perihelion passage. It was observed systematically during four oppositions until 17 October 2010 (see picture).
Comet had its closest approach to the Earth on 8 April 2008 (2.241 au), about 3 months before its perihelion passage.
Preferred solution given here is based on data spanning over 4.16 yr in a range of heliocentric distances: 6.83 au – 2.764 au (perihelion) – 7.91 au.
This Oort spike comet suffers rather large planetary perturbations during its passage through the planetary system and these perturbations lead to more tight future orbit with semimajor axis of about 1,400 au (see future barycentric orbits).
See also Królikowska and Dybczyński 2013 and Królikowska 2020.

solution description
number of observations 2734
data interval 2006 08 20 – 2010 10 17
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 6.83 au – 2.76 au (perihelion) – 7.91 au
type of model of motion NT - non-gravitational orbits for asymmetric, standard g(r)
data weighting YES
number of residuals 5367
RMS [arcseconds] 0.37
orbit quality class 1a+
orbital elements (heliocentric ecliptic J2000)
Epoch 2008 06 23
perihelion date 2008 07 03.85627978 ± 0.00011742
perihelion distance [au] 2.76364210 ± 0.00000063
eccentricity 0.99977442 ± 0.00000119
argument of perihelion [°] 344.379863 ± 0.000029
ascending node [°] 199.546488 ± 0.000005
inclination [°] 59.04692 ± 0.000006
recip semi-major axis [10-6 au-1] 81.62 ± 0.43
Time distribution of positional observations with corresponding heliocentric (red curve) and geocentric (green curve) distance at which they were taken. The horizontal dotted line shows the perihelion distance for a given comet whereas vertical dotted line – the moment of perihelion passage
non-gravitational parameters
A1 [10-8au\day-2] 31.785 ± 0.752
A2 [10-8au\day-2] -2.7101 ± 0.7274
A3 [10-8au\day-2] 10.199 ± 0.189
m -2.15
n 5.093
k -4.6142
r0 [au] 2.808
α 0.1113
ΔT [days] 37.6710 ± 4.166