C/1999 F2 Delcanton
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C/1999 F2 was discovered on 20 March 1999 by J. Delcanton in the Sloan Digital Sky Survey as an apparently cometary object, seven months after perihelion passage. Soon after, Gareth V. Williams found pre-discovery measurements in archival LINEAR data going back to 18 June 1998 [IAUC 7194, 1999 June 8]. Later, the pre-discovery detection from 15 May 1998 taken by Two Micron All Sky Survey (2MASS) was found.
This comet made its closest approach to the Earth on 14 April 1998 (3.923 au), about four months before perihelion.
Solution given here is based on data spanning over 2.3 yr in a range of heliocentric distances: 4.79 au – 4.719 au (perihelion) – 7.30 au.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead to notable more tight future orbit (see future barycentric orbit).
See also Królikowska 2014 and Królikowska and Dybczyński 2017.
This comet made its closest approach to the Earth on 14 April 1998 (3.923 au), about four months before perihelion.
Solution given here is based on data spanning over 2.3 yr in a range of heliocentric distances: 4.79 au – 4.719 au (perihelion) – 7.30 au.
This Oort spike comet suffers moderate planetary perturbations during its passage through the planetary system that lead to notable more tight future orbit (see future barycentric orbit).
See also Królikowska 2014 and Królikowska and Dybczyński 2017.
| solution description | ||
|---|---|---|
| number of observations | 148 | |
| data interval | 1998 05 15 – 2000 08 29 | |
| data type | significantly more measurements after perihelion (POST+) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 4.79 au – 4.72 au (perihelion) – 7.3 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 | 293 | |
| RMS [arcseconds] | 0.73 | |
| orbit quality class | 1a | |
| previous orbit statistics, both Galactic and stellar perturbations were taken into account | ||
|---|---|---|
| no. of returning VCs in the swarm | 5001 | * |
| no. of escaping VCs in the swarm | 0 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 38.07 – 40.42 – 40.95 | |
| previous perihelion distance [au] | 150 – 320 – 520 | |
| previous aphelion distance [103 au] | 48.6 – 49.2 – 52 | |
| time interval to previous perihelion [Myr] | 2.7 – 3.1 – 3.5 | |
| percentage of VCs with qprev < 10 | 1 | |
| percentage of VCs with qprev > 20 | 99 | |
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.
| previous orbit statistics, here only the Galactic tide has been included | ||
|---|---|---|
| no. of returning VCs in the swarm | 5001 | * |
| no. of escaping VCs in the swarm | 0 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 42.70 – 46.97 – 51.20 | |
| previous perihelion distance [au] | 6.2 – 7 – 8.6 | |
| previous aphelion distance [103 au] | 39.1 – 42.6 – 46.8 | |
| time interval to previous perihelion [Myr] | 2.7 – 3.1 – 3.6 | |
| percentage of VCs with qprev < 10 | 98 | |
| percentage of VCs with 10 < qprev < 20 | 2 | |