C/1996 E1 NEAT
more info
Comet C/1996 E1 was discovered on 15 March 1996 by Near-Earth-Asteroid Tracking Team (Jet Propulsion Laboratory), that is about 4.5 months before its perihelion passage.This comet was last observed in the mid-October 1996.
Comet had its closest approach to the Earth on 25 September 1996 (1.168 au), about 2 months after its perihelion passage.
This is a comet with nongravitational effects strongly manifested in positional data fitting.
Solutions given here are based on data spanning over 0.578 yr in a range of heliocentric distances: 2.31 au – 1.36 au (perihelion) – 1.76 au.
This Oort spike comet suffers rather moderate planetary perturbations during its passage through the planetary system; these perturbations lead to a more tight future orbit.
See also Królikowska 2014 and Królikowska 2020.

solution description
number of observations 249
data interval 1996 03 15 – 1996 10 12
data type significantly more measurements before perihelion (PRE+)
data arc selection entire data set (STD)
range of heliocentric distances 2.31 au – 1.36 au (perihelion) – 1.76 au
type of model of motion NS - non-gravitational orbits for standard g(r)
data weighting YES
number of residuals 492
RMS [arcseconds] 0.60
orbit quality class 1b
orbital elements (heliocentric ecliptic J2000)
Epoch 1996 02 07
perihelion date 1996 07 27.35317552 ± 0.00020105
perihelion distance [au] 1.35878564 ± 0.00000638
eccentricity 1.00078927 ± 0.00000621
argument of perihelion [°] 81.117630 ± 0.000330
ascending node [°] 149.841680 ± 0.000036
inclination [°] 114.473289 ± 0.000027
recip semi-major axis [10-6 au-1] -580.86 ± 4.57
Upper panel: 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.
Lower panel (panels): O-C diagram for this(two) solution (solutions) given in this database, where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
non-gravitational parameters
A1 [10-8au\day-2] 6.6877 ± 0.3113
A2 [10-8au\day-2] 0.68825 ± 0.09355
A3 [10-8au\day-2] 0 (assumed)
m -2.15
n 5.093
k -4.6142
r0 [au] 2.808
α 0.1113