C/2012 S3 PANSTARRS
more info
Comet C/2012 S3 was discovered on 27 September 2012 with Pan-STARRS 1 telescope (Haleakala), that is 11 months before its perihelion passage. It was observed until 4 April 2014 (see picture).
C/2012 S3 had its closest approach to the Earth on 1 August 2013 (1.338 au), about a month before its perihelion passage.
Solutions given here are based on data spanning over 1.52 yr in a range of heliocentric distances: 4.25 au – 2.308 au (perihelion) – 3.30 au.
This Oort spike comet suffers rather small planetary perturbations during its passage through the planetary system that cause a tighter future orbit (see future barycentric orbits).

solution description
number of observations 749
data interval 2012 09 27 – 2014 04 04
data type significantly more measurements before perihelion (PRE+)
data arc selection entire data set (STD)
range of heliocentric distances 4.25 au – 2.31 au (perihelion) – 3.3 au
type of model of motion NS - non-gravitational orbits for standard g(r)
data weighting YES
number of residuals 1457
RMS [arcseconds] 0.38
orbit quality class 1a
orbital elements (heliocentric ecliptic J2000)
Epoch 2013 08 16
perihelion date 2013 08 31.12513350 ± 0.00037821
perihelion distance [au] 2.30808938 ± 0.00000120
eccentricity 1.00076137 ± 0.00000440
argument of perihelion [°] 183.748869 ± 0.000148
ascending node [°] 121.305542 ± 0.000007
inclination [°] 112.931554 ± 0.000036
recip semi-major axis [10-6 au-1] -329.87 ± 1.91
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] 6.0044 ± 0.6064
A2 [10-8au\day-2] 4.4673 ± 0.8734
A3 [10-8au\day-2] -0.29361 ± 0.41497
m -2.15
n 5.093
k -4.6142
r0 [au] 2.808
α 0.1113