C/2009 UG89 Lemmon
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C/2009 UG89 was discovered on 22 October 2009 by Albert D. Grauer as an apparently asteroidal object (Mt Lemmon); CCD images taken by observers in April 2010 revealed a cometary activity [IAUC 9141, 2010 April 27]. C/2009 UG89 passed perihelion in December 2010.
This comet was followed by 2.5 yr during four oppositions in a range of heliocentric distances: 5.30 au – 3.931 au (perihelion) – 5.73 au.
C/2009 UG89 had its closest approach to the Earth on 23 July 2010 (3.253 au, almost five months before perihelion passage).
The comet passed close to Jupiter one year and three months before perihelion passage (0.499 au, 23 September 2009, one month before discovery).
Therefore, this comet suffers large planetary perturbations during its passage through the planetary system that lead to escape of the comet from the solar system on hyperbolic orbit (see future barycentric orbit).
See also Królikowska and Dybczyński 2017.
This comet was followed by 2.5 yr during four oppositions in a range of heliocentric distances: 5.30 au – 3.931 au (perihelion) – 5.73 au.
C/2009 UG89 had its closest approach to the Earth on 23 July 2010 (3.253 au, almost five months before perihelion passage).
The comet passed close to Jupiter one year and three months before perihelion passage (0.499 au, 23 September 2009, one month before discovery).
Therefore, this comet suffers large planetary perturbations during its passage through the planetary system that lead to escape of the comet from the solar system on hyperbolic orbit (see future barycentric orbit).
See also Królikowska and Dybczyński 2017.
| solution description | ||
|---|---|---|
| number of observations | 988 | |
| data interval | 2009 10 22 – 2012 04 27 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 5.3 au – 3.93 au (perihelion) – 5.73 au | |
| detectability of NG effects in the comet's motion | NG effects not determinable | |
| type of model of motion | GR - gravitational orbit | |
| data weighting | YES | |
| number of residuals | 1938 | |
| RMS [arcseconds] | 0.43 | |
| orbit quality class | 1a+ | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 2010 12 30 | |
| perihelion date | 2010 12 16.27024623 | ± 0.00017341 |
| perihelion distance [au] | 3.93116688 | ± 0.00000113 |
| eccentricity | 1.00805713 | ± 0.00000183 |
| argument of perihelion [°] | 60.653833 | ± 0.000029 |
| ascending node [°] | 321.008496 | ± 0.000008 |
| inclination [°] | 130.100465 | ± 0.000007 |
| reciprocal semi-major axis [10-6 au-1] | -2,049.55 | ± 0.46 |
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.