C/2000 Y1 Tubbiolo

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C/2000 Y1 Tubbiolo

General description

C/2000 Y1 was discovered on 16 December 2000 by A.F. Tubbiolo with the 0.9m Spacewatch telescope at Kitt Peak. At once, pre-discovery detections by LINEAR going back to 24 October 2000 were found [IAUC 7544, 2000 December 18].

This comet made its closest approach to Earth on 23 November 2000 (7.000 au), 2.3 months before perihelion.

Solution given below is based on data span over 2.0 yr in a range of heliocentric distances: 8.00 au – 7.975 au (perihelion) – 8.86 au.

Figure caption: 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.

SSDP Cometary Note C2000Y1A1-001

Comet C/2000 Y1 Tubbiolo

number of observations	94
number of residuals	185
data interval	2000 Oct. 24 — 2002 Nov. 5
rms [arcsec]	0.74
orbit quality class	1a

Osculating orbital elements (heliocentric; ecliptic J2000.0)

Epoch (TT)	20010401.0	= JD 2452000.5
time of perihelion passage (TT)	20010202.142668	± 0.012487
perihelion distance	7.97474088	± 0.00004697
eccentricity	1.00268899	± 0.00003350
argument of perihelion [deg]	181.731551	± 0.000767
longitude of the ascending node [deg]	239.395267	± 0.000036
inclination [deg]	137.976898	± 0.000104
inverse semimajor axis [10^-6 au^-1]	-337.19	± 4.19

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 Y1. 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)	16900210
time of perihelion passage (TT)	20010203.415766	± 0.012454
perihelion distance	7.96805733	± 0.00004701
eccentricity	0.99951843	± 0.00003372
argument of perihelion [deg]	181.777248	± 0.000767
longitude of the ascending node [deg]	239.382014	± 0.000036
inclination [deg]	138.029678	± 0.000103
inverse semimajor axis [10^-6 au^-1]	60.44	± 4.23

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.

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

Epoch (TT)	23110417
time of perihelion passage (TT)	20010131.885868	± 0.012405
perihelion distance	7.96565179	± 0.00004716
eccentricity	0.99998723	± 0.00003373
argument of perihelion [deg]	181.639132	± 0.000763
longitude of the ascending node [deg]	239.409922	± 0.000036
inclination [deg]	137.998707	± 0.000103
inverse semimajor axis [10^-6 au^-1]	1.60	± 4.23