C/1999 N4 LINEAR
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C/1999 N4 was discovered as an apparently asteroidal object by LINEAR team on 12 July 1999 (ten months before perihelion passage), and soon reported as cometary by observers [IAUC 7226, 1999 July 17]. Later, pre-discovery detection from 27 August 1998 by LINEAR was found.
This comet made its closest approach to the Earth on 4 June 2000 (4.589 au), twelve days after perihelion.
Solution given here is based on data spanning over 3.7 yr in a range of heliocentric distances: 7.14 au – 5.505 au (perihelion) – 7.49 au.
This Oort spike comet suffers slight planetary perturbations during its passage through the planetary system.
See also Królikowska 2014 and Królikowska and Dybczyński 2017.

solution description
number of observations 345
data interval 1998 08 27 – 2002 05 06
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 7.14 au – 5.50 au (perihelion) – 7.49 au
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 661
RMS [arcseconds] 0.53
orbit quality class 1a
orbital elements (heliocentric ecliptic J2000)
Epoch 2000 05 16
perihelion date 2000 05 23.73462200 ± 0.00081600
perihelion distance [au] 5.50473873 ± 0.00000628
eccentricity 1.00419246 ± 0.00000778
argument of perihelion [°] 90.429037 ± 0.000097
ascending node [°] 345.901293 ± 0.000045
inclination [°] 156.922915 ± 0.000009
recip semi-major axis [10-6 au-1] -761.61 ± 1.41
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