C/1999 U4 Catalina-Skiff
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C/1999 U4 was discovered on 31 October 1999 by the Catalina Sky Survey, and, independently, on 1 November by B.A. Skiff under LONEOS Survey. At once, its cometary apperance was reported [IAUC 7298, 1999 November 1]. Later, pre-discovery detections from 18 September and 30 October 1999 were found.
This comet made its closest approach to the Earth on 11 January 2002 (4.415 au), 2.5 months after perihelion.
Solutions given here are based on data spanning over 4.6 yr in a range of heliocentric distances: 7.55 au – 4.915 au (perihelion) – 8.22 au.
This Oort spike comet suffers moderate 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.
This comet made its closest approach to the Earth on 11 January 2002 (4.415 au), 2.5 months after perihelion.
Solutions given here are based on data spanning over 4.6 yr in a range of heliocentric distances: 7.55 au – 4.915 au (perihelion) – 8.22 au.
This Oort spike comet suffers moderate 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 | 911 | |
| data interval | 1999 09 18 – 2004 04 11 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 7.55 au – 4.92 au (perihelion) – 8.22 au | |
| type of model of motion | NS - non-gravitational orbits for standard g(r) | |
| data weighting | YES | |
| number of residuals | 1807 | |
| RMS [arcseconds] | 0.75 | |
| orbit quality class | 1a+ | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2001 10 18 | |
| perihelion date | 2001 10 28.46167943 | ± 0.00077141 |
| perihelion distance [au] | 4.91529774 | ± 0.00000550 |
| eccentricity | 1.00763318 | ± 0.00000590 |
| argument of perihelion [°] | 77.512620 | ± 0.000105 |
| ascending node [°] | 32.288890 | ± 0.000013 |
| inclination [°] | 51.926235 | ± 0.000012 |
| recip semi-major axis [10-6 au-1] | -1,552.94 | ± 1.20 |
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.
| non-gravitational parameters | ||
|---|---|---|
| A1 [10-8au/day2] | 0.88288 | ± 0.15679 |
| A2 [10-8au/day2] | -1.244 | ± 0.1835 |
| A3 [10-8au/day2] | 1.7011 | ± 0.025 |
| m | -2.00 | |
| n | 3.000 | |
| k | -2.6000 | |
| r0 [au] | 10.000 | |
| α | 0.0100 | |