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Comet C/2011 Q1 was discovered on 20 August 2011 by Pan-STARRS 1 telescope (Haleakala), that is about 1.5 month after its perihelion passage. Soon, C/2011 Q1 was found on earlier images taken on 17 August 2011 with the Pan-STARRS 1 survey. It was occasionally observed less than a year.
Comet had its closest approach to the Earth on 21 August 2011 (6.046 au), a day after its discovery.
Solution given here is based on data spanning over 0.86 yr in a range of heliocentric distances from 6.79 au to 7.18 au.
This comet have orignal semimajor axis shorter than 10000 au; it suffers a tiny planetary perturbations during its passage through the planetary system that lead to a more tight future orbit. (see future barycentric orbit).

solution description
number of observations 59
data interval 2011 08 17 – 2012 06 25
data type observed only after perihelion (POST)
data arc selection entire data set (STD)
range of heliocentric distances 6.79 au – 7.18au
detectability of NG effects in the comet's motion NG effects not determinable
type of model of motion GR - gravitational orbit
data weighting YES
number of residuals 106
RMS [arcseconds] 0.29
orbit quality class 1b
orbital elements (heliocentric ecliptic J2000)
Epoch 2011 07 18
perihelion date 2011 06 29.33476597 ± 0.02287524
perihelion distance [au] 6.78003103 ± 0.00002991
eccentricity 0.99797331 ± 0.00002969
argument of perihelion [°] 135.916991 ± 0.001823
ascending node [°] 142.245646 ± 0.000086
inclination [°] 94.860033 ± 0.00011
reciprocal semi-major axis [10-6 au-1] 298.92 ± 4.38
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.