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 Earth on 3 November 2001 (3.195 au, six months before perihelion).

Nongravitational solution bbased on entire data arc still reveals some trends in (O-C) where most evident are in the last opposition; NG orbits independently using pre-perihelion and post-perihelion data are also determinable.

Nakano non-gravitational solution [ Nakano Notes 1258] also shows trends in (O-C) in the last opposition. This 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).

See also Królikowska and Dones 2023 and Królikowska and Dybczyński 2017.
solution description
number of observations 2203
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 NC - non-gravitational orbits for symmetric CO-g(r)-like function
data weighting YES
number of residuals 4382
RMS [arcseconds] 0.66
orbit quality class 1a+
orbital elements (barycentric ecliptic J2000)
Epoch 2304 01 24
perihelion date 2002 04 29.67930663 ± 0.00060198
perihelion distance [au] 3.53663112 ± 0.00000533
eccentricity 1.00025509 ± 0.00000369
argument of perihelion [°] 76.071969 ± 0.000128
ascending node [°] 24.187819 ± 0.000014
inclination [°] 75.352728 ± 0.000017
reciprocal semi-major axis [10-6 au-1] -72.13 ± 1.04
file containing 5001 VCs swarm
2000svc8.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.
Middle panel(s): O-C diagram for a given solution (sometimes in comparison to another solution available in CODE), where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
Lowest panel: Relative weights for a given data set(s).
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.