C/2005 EL173 LONEOS
more info
C/2005 EL173 was discovered on 8 March 2005 by the LONEOS as an apparently asteroidal object in a retrograde orbit and semimajor axis of 36 au [MPEC 2005-F48, 2005 March 29]. Therefore it was initially classified as cubewano or scattered disc object in MPC. Its cometary apperance was reported by A. Fitzsimmons on 10 May 2005.
This comet made its closest approach to the Earth on 4 January 2007 (3.310 au), two months before perihelion.
Solutions given here are based on data spanning over 3.7 yr in a range of heliocentric distances: 7.12 au – 3.886 au (perihelion) – 6.45 au.
This Oort spike comet suffers rather slight planetary perturbations during its passage through the planetary system; however, these perturbations move out this comet from the solar system.
See also Królikowska 2014 and Królikowska and Dybczyński 2017.

solution description
number of observations 317
data interval 2005 03 03 – 2008 11 17
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 7.12 au – 3.89 au (perihelion) – 6.45 au
type of model of motion NS - non-gravitational orbits for standard g(r)
data weighting YES
number of residuals 632
RMS [arcseconds] 0.36
orbit quality class 1a+
orbital elements (heliocentric ecliptic J2000)
Epoch 2007 03 01
perihelion date 2007 03 05.87190600 ± 0.00018000
perihelion distance [au] 3.88631166 ± 0.00000283
eccentricity 1.00333283 ± 0.00000329
argument of perihelion [°] 261.493679 ± 0.000034
ascending node [°] 344.796425 ± 0.000009
inclination [°] 130.67961 ± 0.000008
recip semi-major axis [10-6 au-1] -857.58 ± 0.84
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] 6602 ± 773
A2 [10-8au\day-2] -7175 ± 496
A3 [10-8au\day-2] 0 (assumed)
m -2.15
n 5.093
k -4.6142
r0 [au] 2.808
α 0.1113