C/2000 SV74 LINEAR

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C/2000 SV₇₄ LINEAR

General description

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 (see below).

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 given below reveals some trends in (O-C) where most evident are in the last opposition.

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/a_origin = +0.000074, 1/a_future = -0.000073).

Figure caption: 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: O-C diagram for the gravitational solution shows some trends in right ascension (magenta dots) and declination (blue open circles).

SSDP Cometary Note C2000SVN8-001

Comet C/2000 SV₇₄ LINEAR

number of observations	2207
number of residuals	4382
data interval	2000 Sep. 5 — 2005 May 12
rms [arcsec]	0.67
orbit quality class	1a+

Osculating orbital elements (heliocentric; ecliptic J2000.0)

Epoch (TT)	20020506.0	= JD 2452400.5
time of perihelion passage (TT)	20020430.474305	± 0.000103
perihelion distance	3.54159154	± 0.00000164
eccentricity	1.00479869	± 0.00000203
argument of perihelion [deg]	76.226371	± 0.000018
longitude of the ascending node [deg]	24.185273	± 0.000005
inclination [deg]	75.237137	± 0.000008
inverse semimajor axis [10^-6 au^-1]	-1354.95	± 0.57

Nongravitational parameters [10^-8 au/day²]

A₁ = 6064.600 ± 76.399

A₂ = 550.610 ± 59.670

A₃ = -595.980 ± 21.675

Note: Epoch is given in a format: yyyymmdd.d, time of perihelion passage in a format of yyyymmdd.dddddd.

Figure caption: Six 2D-projections of the 6D space of original swarm (5001 VCs) of C/2000 SV₇₄. Each density map is given in logarithmic scale presented on the right in the individual panel.
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Original orbital elements (barycentric; at 250 au from the Sun)

Epoch (TT)	16980827
time of perihelion passage (TT)	20020430.081183	± 0.000312
perihelion distance	3.52665909	± 0.00000215
eccentricity	0.99967965	± 0.00000272
argument of perihelion [deg]	76.492790	± 0.000065
longitude of the ascending node [deg]	24.152992	± 0.000010
inclination [deg]	75.360945	± 0.000012
inverse semimajor axis [10^-6 au^-1]	90.84	± 0.77

Note: Values of uncertainties of original/future orbital elements were derived using a swarm of 5001 osculating orbits of VCs (including the nominal osculating orbit given above) for original/future orbital evolution calclulations and then by fitting the distribution of a given orbital element of original/future swarm of VCs to Gaussian distribution.

Original barycentric positions and velocities of 5001 VCs at 250 au from the Sun are given here (data format), i.e. before entering the planetary zone.

Figure caption: Six 2D-projections of the 6D space of future swarm (5001 VCs) of C/2000 SV₇₄. Each density map is given in logarithmic scale presented on the right in the individual panel.
The same figure in the new window

Future orbital elements (barycentric; at 250 au from the Sun)

Epoch (TT)	23040413
time of perihelion passage (TT)	20020429.659128	± 0.000293
perihelion distance	3.53676654	± 0.00000209
eccentricity	1.00018991	± 0.00000213
argument of perihelion [deg]	76.072968	± 0.000061
longitude of the ascending node [deg]	24.187876	± 0.000010
inclination [deg]	75.352548	± 0.000008
inverse semimajor axis [10^-6 au^-1]	-53.69	± 0.60

Future barycentric positions and velocities of 5001 VCs at 250 au from the Sun are given here (data format), i.e. after leaving the planetary zone.