C/2011 Q1 PANSTARRS
more info
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 (barycentric ecliptic J2000)
Epoch 1698 10 06
perihelion date 2011 06 29.32364126 ± 0.02297556
perihelion distance [au] 6.77919552 ± 0.00003011
eccentricity 0.99751342 ± 0.00002967
argument of perihelion [°] 135.890507 ± 0.001832
ascending node [°] 142.209787 ± 0.000088
inclination [°] 94.854042 ± 0.000112
reciprocal semi-major axis [10-6 au-1] 366.79 ± 4.38
file containing 5001 VCs swarm
2011q1a1.bmi
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.
Six 2D-projections of the 6D space of original swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.