C/2000 SV74 LINEAR
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Comet C/2000 SV74 was discovered on 24 September 2009 by LINEAR as an apparently asteroidal object; CCD images taken by Milos Tichy (Klet Observatory) on 19 October 2000 revealed a cometary appearance [[IAUC 7510, 2000 October 19]. Later, five images of this object were found on LINEAR exposures taken on 5 September 2000. Comet passed perihelion at the end of April 2002.

C/2000 SV74 was observed 4.7 yr in a range of heliocentric distances: 6.26 au – 3.542 au (perihelion) – 9.51 au.
Comet had its closest approach to the Earth on 3 November 2001 (3.195 au, six months before perihelion).
Nongravitational solution still reveals some systematic trends in (O-C), probably two independent solutions for pre- and post-perihelion data can improve the situation (will be done in a future).
Nakano non-gravitational solution [ Nakano Notes 1258] also shows trends in (O-C) in the last opposition. That solution, derived by T. Kobayashi, is based on 2116 observations (arc: 2000 September 5 to 2005 April 15; rms = 0.60 arcsec) and the NG-effects of sublimating CO-molecule (or N2) using Yabushita's theory (MNRAS 283, 347), and gives 1/aorigin = +0.000074, 1/afuture = -0.000073).
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 and Dybczyński 2017.

solution description
number of observations 2207
data interval 2000 09 05 – 2005 05 12
data type perihelion within the observation arc (FULL)
data arc selection entire data set (STD)
range of heliocentric distances 6.26 au – 3.54 au (perihelion) – 9.51 au
type of model of motion NS - non-gravitational orbits for standard g(r)
data weighting YES
number of residuals 4382
RMS [arcseconds] 0.67
orbit quality class 1a+
orbital elements (barycentric ecliptic J2000)
Epoch 2304 04 13
perihelion date 2002 04 29.65912770 ± 0.00029332
perihelion distance [au] 3.53676654 ± 0.00000209
eccentricity 1.00018991 ± 0.00000213
argument of perihelion [°] 76.072968 ± 0.000061
ascending node [°] 24.187876 ± 0.000010
inclination [°] 75.352548 ± 0.000008
recip semi-major axis [10-6 au-1] -53.69 ± 0.60
file containing 5001 VCs swarm
2000svn8.bpl
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.
Six 2D-projections of the 6D space of future swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.