C/2001 G1 LONEOS
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C/2001 G1 was discovered on 1 April 2001 by the LONEOS as an apparently asteroidal object. At once, its cometary apperance was reported [IAUC 7606, 2001 April 2]. Later, pre-discovery detections by Air Force Maui Optical and Supercomputing observatory (AMOS) from 28 and 29 December 2000 were found.
This comet made its closest approach to the Earth on 8 April 2002 (7.309 au), six months after perihelion.
Solution given here is based on data spanning over 2.4 yr in a range of heliocentric distances: 8.41 au – 8.235 au (perihelion) – 8.98  au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system that lead to escape of the comet from the solar system on hiperbolic orbit (see future barycentric orbit).
See also Królikowska 2014 and Królikowska and Dybczyński 2017.

solution description
number of observations 138
data interval 2000 12 28 – 2003 06 01
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 8.41 au – 8.23 au (perihelion) – 8.98 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 266
RMS [arcseconds] 0.58
orbit quality class 1a
orbital elements (heliocentric ecliptic J2000)
Epoch 2001 10 18
perihelion date 2001 10 09.14161300 ± 0.00827900
perihelion distance [au] 8.23542303 ± 0.00003133
eccentricity 1.00244802 ± 0.00002288
argument of perihelion [°] 343.278402 ± 0.000468
ascending node [°] 203.889833 ± 0.000024
inclination [°] 45.368344 ± 0.000044
recip semi-major axis [10-6 au-1] -297.25 ± 2.77
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